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Powell Industries Inc. – ‘10-Q’ for 6/30/20 – ‘EX-101.LAB’

On:  Wednesday, 8/5/20, at 2:17pm ET   ·   For:  6/30/20   ·   Accession #:  80420-20-27   ·   File #:  1-12488

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  As Of               Filer                 Filing    For·On·As Docs:Size

 8/05/20  Powell Industries Inc.            10-Q        6/30/20   66:5.4M

Quarterly Report   —   Form 10-Q
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-Q        Quarterly Report                                    HTML    733K 
 2: EX-31.1     Certification -- §302 - SOA'02                      HTML     24K 
 3: EX-31.2     Certification -- §302 - SOA'02                      HTML     24K 
 4: EX-32.1     Certification -- §906 - SOA'02                      HTML     20K 
 5: EX-32.2     Certification -- §906 - SOA'02                      HTML     20K 
12: R1          Cover Page                                          HTML     71K 
13: R2          Condensed Consolidated Balance Sheets (Unaudited)   HTML    128K 
14: R3          Condensed Consolidated Balance Sheets (Unaudited)   HTML     36K 
                (Parenthetical)                                                  
15: R4          Condensed Consolidated Statements of Operations     HTML     93K 
                (Unaudited)                                                      
16: R5          Condensed Consolidated Statements of Comprehensive  HTML     33K 
                Income (Loss) (Unaudited)                                        
17: R6          Condensed Consolidated Statements of Stockholders'  HTML     86K 
                Equity (Unaudited)                                               
18: R7          Condensed Consolidated Statements of Cash Flows     HTML     91K 
                (Unaudited)                                                      
19: R8          Overview and Summary of Significant Accounting      HTML     34K 
                Policies                                                         
20: R9          Earnings Per Share                                  HTML     49K 
21: R10         Detail of Selected Balance Sheet Accounts           HTML     66K 
22: R11         Revenue                                             HTML     92K 
23: R12         Long-Term Debt                                      HTML     33K 
24: R13         Commitments and Contingencies                       HTML     24K 
25: R14         Stock-Based Compensation                            HTML     34K 
26: R15         Fair Value Measurements                             HTML     62K 
27: R16         Leases                                              HTML     52K 
28: R17         Income Taxes                                        HTML     50K 
29: R18         Separation Costs                                    HTML     20K 
30: R19         Subsequent Events                                   HTML     21K 
31: R20         Overview and Summary of Significant Accounting      HTML     51K 
                Policies (Policies)                                              
32: R21         Earnings Per Share (Tables)                         HTML     48K 
33: R22         Detail of Selected Balance Sheet Accounts (Tables)  HTML     71K 
34: R23         Revenue (Tables)                                    HTML     72K 
35: R24         Long-Term Debt (Tables)                             HTML     29K 
36: R25         Stock-Based Compensation (Tables)                   HTML     29K 
37: R26         Fair Value Measurements (Tables)                    HTML     56K 
38: R27         Leases (Tables)                                     HTML     54K 
39: R28         Income Taxes (Tables)                               HTML     42K 
40: R29         Overview and Summary of Significant Accounting      HTML     25K 
                Policies - New Accounting Standard (Details)                     
41: R30         Earnings Per Share (Details)                        HTML     51K 
42: R31         Detail of Selected Balance Sheet Accounts -         HTML     28K 
                Activity in Allowance for Doubtful Accounts                      
                Receivable (Details)                                             
43: R32         Detail of Selected Balance Sheet Accounts -         HTML     25K 
                Components of Inventories (Details)                              
44: R33         Detail of Selected Balance Sheet Accounts -         HTML     28K 
                Activity in Product Warranty Accrual (Details)                   
45: R34         Revenue - Narrative (Details)                       HTML     31K 
46: R35         Revenue - Performance Obligations (Details)         HTML     26K 
47: R36         Revenue - Contract Balances (Details)               HTML     36K 
48: R37         Revenue - Disaggregation of Revenue (Details)       HTML     46K 
49: R38         Long-Term Debt - Components of Long-Term Debt       HTML     25K 
                (Details)                                                        
50: R39         Long-Term Debt - Narrative (Details)                HTML     65K 
51: R40         Commitments and Contingencies (Details)             HTML     31K 
52: R41         Stock-Based Compensation - Narrative (Details)      HTML     50K 
53: R42         Stock-Based Compensation - Schedule of Restricted   HTML     42K 
                Stock Units Activity (Details)                                   
54: R43         Fair Value Measurements (Details)                   HTML     37K 
55: R44         Leases - Lease Costs (Details)                      HTML     29K 
56: R45         Leases - Narrative (Details)                        HTML     24K 
57: R46         Leases - Summary of Operating Lease Assets and      HTML     27K 
                Liabilities (Details)                                            
58: R47         Leases - Maturities of Operating Lease Liabilities  HTML     36K 
                (Details)                                                        
59: R48         Income Taxes - Schedule of Calculation of the       HTML     38K 
                Effective Tax Rate (Details)                                     
60: R49         Income Taxes - Narrative (Details)                  HTML     25K 
61: R50         Separation Costs (Details)                          HTML     21K 
62: R51         Subsequent Events (Details)                         HTML     23K 
64: XML         IDEA XML File -- Filing Summary                      XML    113K 
11: XML         XBRL Instance -- powl10-qq32020_htm                  XML   1.26M 
63: EXCEL       IDEA Workbook of Financial Reports                  XLSX     73K 
 7: EX-101.CAL  XBRL Calculations -- powl-20200630_cal               XML    178K 
 8: EX-101.DEF  XBRL Definitions -- powl-20200630_def                XML    281K 
 9: EX-101.LAB  XBRL Labels -- powl-20200630_lab                     XML   1.09M 
10: EX-101.PRE  XBRL Presentations -- powl-20200630_pre              XML    615K 
 6: EX-101.SCH  XBRL Schema -- powl-20200630                         XSD    105K 
65: JSON        XBRL Instance as JSON Data -- MetaLinks              287±   399K 
66: ZIP         XBRL Zipped Folder -- 0000080420-20-000027-xbrl      Zip    178K

‘EX-101.LAB’   —   XBRL Labels — powl-20200630_lab

This Exhibit is an XBRL XML File.

                                                                                                                                                                                
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<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressAddressLine1" xlink:label="loc_dei_EntityAddressAddressLine1_7534DE0B9489D44FFB289244C8B0C112" xlink:type="locator"/>
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<link:label id="lab_dei_EntityAddressCityOrTown_CEC9455FA0E066BA0C6A9244C8B08B6D_terseLabel_en-US" xlink:label="lab_dei_EntityAddressCityOrTown_CEC9455FA0E066BA0C6A9244C8B08B6D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Address, City or Town </link:label>
<link:label id="lab_dei_EntityAddressCityOrTown_CEC9455FA0E066BA0C6A9244C8B08B6D_label_en-US" xlink:label="lab_dei_EntityAddressCityOrTown_CEC9455FA0E066BA0C6A9244C8B08B6D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Address, City or Town </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressCityOrTown" xlink:label="loc_dei_EntityAddressCityOrTown_CEC9455FA0E066BA0C6A9244C8B08B6D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressCityOrTown_CEC9455FA0E066BA0C6A9244C8B08B6D" xlink:to="lab_dei_EntityAddressCityOrTown_CEC9455FA0E066BA0C6A9244C8B08B6D" xlink:type="arc"/>
<link:label id="lab_dei_EntityAddressStateOrProvince_8BF2461B121BCF4C22D99244C8B02382_terseLabel_en-US" xlink:label="lab_dei_EntityAddressStateOrProvince_8BF2461B121BCF4C22D99244C8B02382" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Address, State or Province </link:label>
<link:label id="lab_dei_EntityAddressStateOrProvince_8BF2461B121BCF4C22D99244C8B02382_label_en-US" xlink:label="lab_dei_EntityAddressStateOrProvince_8BF2461B121BCF4C22D99244C8B02382" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Address, State or Province </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressStateOrProvince" xlink:label="loc_dei_EntityAddressStateOrProvince_8BF2461B121BCF4C22D99244C8B02382" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressStateOrProvince_8BF2461B121BCF4C22D99244C8B02382" xlink:to="lab_dei_EntityAddressStateOrProvince_8BF2461B121BCF4C22D99244C8B02382" xlink:type="arc"/>
<link:label id="lab_dei_EntityAddressPostalZipCode_18884CFEC2C90F17FFEF9244C8B1DA8A_terseLabel_en-US" xlink:label="lab_dei_EntityAddressPostalZipCode_18884CFEC2C90F17FFEF9244C8B1DA8A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Address, Postal Zip Code </link:label>
<link:label id="lab_dei_EntityAddressPostalZipCode_18884CFEC2C90F17FFEF9244C8B1DA8A_label_en-US" xlink:label="lab_dei_EntityAddressPostalZipCode_18884CFEC2C90F17FFEF9244C8B1DA8A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Address, Postal Zip Code </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressPostalZipCode" xlink:label="loc_dei_EntityAddressPostalZipCode_18884CFEC2C90F17FFEF9244C8B1DA8A" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressPostalZipCode_18884CFEC2C90F17FFEF9244C8B1DA8A" xlink:to="lab_dei_EntityAddressPostalZipCode_18884CFEC2C90F17FFEF9244C8B1DA8A" xlink:type="arc"/>
<link:label id="lab_dei_CityAreaCode_E387695B149551DFCC8B9244C8B1B798_terseLabel_en-US" xlink:label="lab_dei_CityAreaCode_E387695B149551DFCC8B9244C8B1B798" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> City Area Code </link:label>
<link:label id="lab_dei_CityAreaCode_E387695B149551DFCC8B9244C8B1B798_label_en-US" xlink:label="lab_dei_CityAreaCode_E387695B149551DFCC8B9244C8B1B798" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> City Area Code </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_CityAreaCode" xlink:label="loc_dei_CityAreaCode_E387695B149551DFCC8B9244C8B1B798" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_CityAreaCode_E387695B149551DFCC8B9244C8B1B798" xlink:to="lab_dei_CityAreaCode_E387695B149551DFCC8B9244C8B1B798" xlink:type="arc"/>
<link:label id="lab_dei_LocalPhoneNumber_39FA66B8D611FADB80AC9244C8B18BA3_terseLabel_en-US" xlink:label="lab_dei_LocalPhoneNumber_39FA66B8D611FADB80AC9244C8B18BA3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Local Phone Number </link:label>
<link:label id="lab_dei_LocalPhoneNumber_39FA66B8D611FADB80AC9244C8B18BA3_label_en-US" xlink:label="lab_dei_LocalPhoneNumber_39FA66B8D611FADB80AC9244C8B18BA3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Local Phone Number </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_LocalPhoneNumber" xlink:label="loc_dei_LocalPhoneNumber_39FA66B8D611FADB80AC9244C8B18BA3" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_LocalPhoneNumber_39FA66B8D611FADB80AC9244C8B18BA3" xlink:to="lab_dei_LocalPhoneNumber_39FA66B8D611FADB80AC9244C8B18BA3" xlink:type="arc"/>
<link:label id="lab_dei_Security12bTitle_6A729ACA6202E9247B8A9244C8B164F7_terseLabel_en-US" xlink:label="lab_dei_Security12bTitle_6A729ACA6202E9247B8A9244C8B164F7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Title of 12(b) Security </link:label>
<link:label id="lab_dei_Security12bTitle_6A729ACA6202E9247B8A9244C8B164F7_label_en-US" xlink:label="lab_dei_Security12bTitle_6A729ACA6202E9247B8A9244C8B164F7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Title of 12(b) Security </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_Security12bTitle" xlink:label="loc_dei_Security12bTitle_6A729ACA6202E9247B8A9244C8B164F7" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_Security12bTitle_6A729ACA6202E9247B8A9244C8B164F7" xlink:to="lab_dei_Security12bTitle_6A729ACA6202E9247B8A9244C8B164F7" xlink:type="arc"/>
<link:label id="lab_dei_TradingSymbol_C3B1BBA1FC243D45EC169244C8B1AE46_terseLabel_en-US" xlink:label="lab_dei_TradingSymbol_C3B1BBA1FC243D45EC169244C8B1AE46" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Trading Symbol </link:label>
<link:label id="lab_dei_TradingSymbol_C3B1BBA1FC243D45EC169244C8B1AE46_label_en-US" xlink:label="lab_dei_TradingSymbol_C3B1BBA1FC243D45EC169244C8B1AE46" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Trading Symbol </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_TradingSymbol" xlink:label="loc_dei_TradingSymbol_C3B1BBA1FC243D45EC169244C8B1AE46" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_TradingSymbol_C3B1BBA1FC243D45EC169244C8B1AE46" xlink:to="lab_dei_TradingSymbol_C3B1BBA1FC243D45EC169244C8B1AE46" xlink:type="arc"/>
<link:label id="lab_dei_SecurityExchangeName_7BA4B4D3E3CF16C34B9C9244C8B13B1F_terseLabel_en-US" xlink:label="lab_dei_SecurityExchangeName_7BA4B4D3E3CF16C34B9C9244C8B13B1F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Security Exchange Name </link:label>
<link:label id="lab_dei_SecurityExchangeName_7BA4B4D3E3CF16C34B9C9244C8B13B1F_label_en-US" xlink:label="lab_dei_SecurityExchangeName_7BA4B4D3E3CF16C34B9C9244C8B13B1F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Security Exchange Name </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_SecurityExchangeName" xlink:label="loc_dei_SecurityExchangeName_7BA4B4D3E3CF16C34B9C9244C8B13B1F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_SecurityExchangeName_7BA4B4D3E3CF16C34B9C9244C8B13B1F" xlink:to="lab_dei_SecurityExchangeName_7BA4B4D3E3CF16C34B9C9244C8B13B1F" xlink:type="arc"/>
<link:label id="lab_dei_EntityCurrentReportingStatus_210215112BFF059772D79244C8B1B8BC_terseLabel_en-US" xlink:label="lab_dei_EntityCurrentReportingStatus_210215112BFF059772D79244C8B1B8BC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Current Reporting Status </link:label>
<link:label id="lab_dei_EntityCurrentReportingStatus_210215112BFF059772D79244C8B1B8BC_label_en-US" xlink:label="lab_dei_EntityCurrentReportingStatus_210215112BFF059772D79244C8B1B8BC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Current Reporting Status </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityCurrentReportingStatus" xlink:label="loc_dei_EntityCurrentReportingStatus_210215112BFF059772D79244C8B1B8BC" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityCurrentReportingStatus_210215112BFF059772D79244C8B1B8BC" xlink:to="lab_dei_EntityCurrentReportingStatus_210215112BFF059772D79244C8B1B8BC" xlink:type="arc"/>
<link:label id="lab_dei_EntityInteractiveDataCurrent_674027849955FD08ACC69244C8B29EA2_terseLabel_en-US" xlink:label="lab_dei_EntityInteractiveDataCurrent_674027849955FD08ACC69244C8B29EA2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Interactive Data Current </link:label>
<link:label id="lab_dei_EntityInteractiveDataCurrent_674027849955FD08ACC69244C8B29EA2_label_en-US" xlink:label="lab_dei_EntityInteractiveDataCurrent_674027849955FD08ACC69244C8B29EA2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Interactive Data Current </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityInteractiveDataCurrent" xlink:label="loc_dei_EntityInteractiveDataCurrent_674027849955FD08ACC69244C8B29EA2" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityInteractiveDataCurrent_674027849955FD08ACC69244C8B29EA2" xlink:to="lab_dei_EntityInteractiveDataCurrent_674027849955FD08ACC69244C8B29EA2" xlink:type="arc"/>
<link:label id="lab_dei_EntityFilerCategory_E49A9DB2DA661D6AADC19244C8B28552_terseLabel_en-US" xlink:label="lab_dei_EntityFilerCategory_E49A9DB2DA661D6AADC19244C8B28552" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Filer Category </link:label>
<link:label id="lab_dei_EntityFilerCategory_E49A9DB2DA661D6AADC19244C8B28552_label_en-US" xlink:label="lab_dei_EntityFilerCategory_E49A9DB2DA661D6AADC19244C8B28552" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Filer Category </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityFilerCategory" xlink:label="loc_dei_EntityFilerCategory_E49A9DB2DA661D6AADC19244C8B28552" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityFilerCategory_E49A9DB2DA661D6AADC19244C8B28552" xlink:to="lab_dei_EntityFilerCategory_E49A9DB2DA661D6AADC19244C8B28552" xlink:type="arc"/>
<link:label id="lab_dei_EntitySmallBusiness_4246F3141C6C79E713BD9244C8B2120D_terseLabel_en-US" xlink:label="lab_dei_EntitySmallBusiness_4246F3141C6C79E713BD9244C8B2120D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Small Business </link:label>
<link:label id="lab_dei_EntitySmallBusiness_4246F3141C6C79E713BD9244C8B2120D_label_en-US" xlink:label="lab_dei_EntitySmallBusiness_4246F3141C6C79E713BD9244C8B2120D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Small Business </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntitySmallBusiness" xlink:label="loc_dei_EntitySmallBusiness_4246F3141C6C79E713BD9244C8B2120D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntitySmallBusiness_4246F3141C6C79E713BD9244C8B2120D" xlink:to="lab_dei_EntitySmallBusiness_4246F3141C6C79E713BD9244C8B2120D" xlink:type="arc"/>
<link:label id="lab_dei_EntityEmergingGrowthCompany_4C70553BE19DD5BE38849244C8B246AC_terseLabel_en-US" xlink:label="lab_dei_EntityEmergingGrowthCompany_4C70553BE19DD5BE38849244C8B246AC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Emerging Growth Company </link:label>
<link:label id="lab_dei_EntityEmergingGrowthCompany_4C70553BE19DD5BE38849244C8B246AC_label_en-US" xlink:label="lab_dei_EntityEmergingGrowthCompany_4C70553BE19DD5BE38849244C8B246AC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Emerging Growth Company </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityEmergingGrowthCompany" xlink:label="loc_dei_EntityEmergingGrowthCompany_4C70553BE19DD5BE38849244C8B246AC" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityEmergingGrowthCompany_4C70553BE19DD5BE38849244C8B246AC" xlink:to="lab_dei_EntityEmergingGrowthCompany_4C70553BE19DD5BE38849244C8B246AC" xlink:type="arc"/>
<link:label id="lab_dei_EntityShellCompany_F14A4BF2A9A7CC655F1B9244C8B238B6_terseLabel_en-US" xlink:label="lab_dei_EntityShellCompany_F14A4BF2A9A7CC655F1B9244C8B238B6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Shell Company </link:label>
<link:label id="lab_dei_EntityShellCompany_F14A4BF2A9A7CC655F1B9244C8B238B6_label_en-US" xlink:label="lab_dei_EntityShellCompany_F14A4BF2A9A7CC655F1B9244C8B238B6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Shell Company </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityShellCompany" xlink:label="loc_dei_EntityShellCompany_F14A4BF2A9A7CC655F1B9244C8B238B6" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityShellCompany_F14A4BF2A9A7CC655F1B9244C8B238B6" xlink:to="lab_dei_EntityShellCompany_F14A4BF2A9A7CC655F1B9244C8B238B6" xlink:type="arc"/>
<link:label id="lab_dei_EntityCommonStockSharesOutstanding_1AACAA734D047DA4990E9244C8B2941E_terseLabel_en-US" xlink:label="lab_dei_EntityCommonStockSharesOutstanding_1AACAA734D047DA4990E9244C8B2941E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Common Stock, Shares Outstanding </link:label>
<link:label id="lab_dei_EntityCommonStockSharesOutstanding_1AACAA734D047DA4990E9244C8B2941E_label_en-US" xlink:label="lab_dei_EntityCommonStockSharesOutstanding_1AACAA734D047DA4990E9244C8B2941E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Common Stock, Shares Outstanding </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_1AACAA734D047DA4990E9244C8B2941E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityCommonStockSharesOutstanding_1AACAA734D047DA4990E9244C8B2941E" xlink:to="lab_dei_EntityCommonStockSharesOutstanding_1AACAA734D047DA4990E9244C8B2941E" xlink:type="arc"/>
<link:label id="lab_dei_EntityCentralIndexKey_0D3D1DE154A3655BFB4F9244C8B27015_terseLabel_en-US" xlink:label="lab_dei_EntityCentralIndexKey_0D3D1DE154A3655BFB4F9244C8B27015" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Central Index Key </link:label>
<link:label id="lab_dei_EntityCentralIndexKey_0D3D1DE154A3655BFB4F9244C8B27015_label_en-US" xlink:label="lab_dei_EntityCentralIndexKey_0D3D1DE154A3655BFB4F9244C8B27015" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Central Index Key </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityCentralIndexKey" xlink:label="loc_dei_EntityCentralIndexKey_0D3D1DE154A3655BFB4F9244C8B27015" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityCentralIndexKey_0D3D1DE154A3655BFB4F9244C8B27015" xlink:to="lab_dei_EntityCentralIndexKey_0D3D1DE154A3655BFB4F9244C8B27015" xlink:type="arc"/>
<link:label id="lab_dei_AmendmentFlag_8458F20FD2A7068C2CC69244C8B42021_terseLabel_en-US" xlink:label="lab_dei_AmendmentFlag_8458F20FD2A7068C2CC69244C8B42021" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Amendment Flag </link:label>
<link:label id="lab_dei_AmendmentFlag_8458F20FD2A7068C2CC69244C8B42021_label_en-US" xlink:label="lab_dei_AmendmentFlag_8458F20FD2A7068C2CC69244C8B42021" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Amendment Flag </link:label>
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<link:label id="lab_us-gaap_CreditFacilityDomain_0D772682D9013442868E29FA89E2866F_terseLabel_en-US" xlink:label="lab_us-gaap_CreditFacilityDomain_0D772682D9013442868E29FA89E2866F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Credit Facility </link:label>
<link:label id="lab_us-gaap_CreditFacilityDomain_0D772682D9013442868E29FA89E2866F_label_en-US" xlink:label="lab_us-gaap_CreditFacilityDomain_0D772682D9013442868E29FA89E2866F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Credit Facility [Domain] </link:label>
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<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CreditFacilityDomain_0D772682D9013442868E29FA89E2866F" xlink:to="lab_us-gaap_CreditFacilityDomain_0D772682D9013442868E29FA89E2866F" xlink:type="arc"/>
<link:label id="lab_us-gaap_DomesticLineOfCreditMember_CCDC2F139E932DAB346E29FA89E20372_terseLabel_en-US" xlink:label="lab_us-gaap_DomesticLineOfCreditMember_CCDC2F139E932DAB346E29FA89E20372" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> U.S. Revolver </link:label>
<link:label id="lab_us-gaap_DomesticLineOfCreditMember_CCDC2F139E932DAB346E29FA89E20372_label_en-US" xlink:label="lab_us-gaap_DomesticLineOfCreditMember_CCDC2F139E932DAB346E29FA89E20372" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Domestic Line of Credit [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DomesticLineOfCreditMember" xlink:label="loc_us-gaap_DomesticLineOfCreditMember_CCDC2F139E932DAB346E29FA89E20372" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DomesticLineOfCreditMember_CCDC2F139E932DAB346E29FA89E20372" xlink:to="lab_us-gaap_DomesticLineOfCreditMember_CCDC2F139E932DAB346E29FA89E20372" xlink:type="arc"/>
<link:label id="lab_powl_IndustrialDevelopmentRevenueBondsMember_A20FB1159CC2D80615E429FA89E2DCE5_terseLabel_en-US" xlink:label="lab_powl_IndustrialDevelopmentRevenueBondsMember_A20FB1159CC2D80615E429FA89E2DCE5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Industrial Development Revenue Bonds </link:label>
<link:label id="lab_powl_IndustrialDevelopmentRevenueBondsMember_A20FB1159CC2D80615E429FA89E2DCE5_label_en-US" xlink:label="lab_powl_IndustrialDevelopmentRevenueBondsMember_A20FB1159CC2D80615E429FA89E2DCE5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Industrial Development Revenue Bonds [Member] </link:label>
<link:label id="lab_powl_IndustrialDevelopmentRevenueBondsMember_A20FB1159CC2D80615E429FA89E2DCE5_documentation_en-US" xlink:label="lab_powl_IndustrialDevelopmentRevenueBondsMember_A20FB1159CC2D80615E429FA89E2DCE5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Industrial development revenue bonds. </link:label>
<link:loc xlink:href="powl-20200630.xsd#powl_IndustrialDevelopmentRevenueBondsMember" xlink:label="loc_powl_IndustrialDevelopmentRevenueBondsMember_A20FB1159CC2D80615E429FA89E2DCE5" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_powl_IndustrialDevelopmentRevenueBondsMember_A20FB1159CC2D80615E429FA89E2DCE5" xlink:to="lab_powl_IndustrialDevelopmentRevenueBondsMember_A20FB1159CC2D80615E429FA89E2DCE5" xlink:type="arc"/>
<link:label id="lab_us-gaap_DebtInstrumentAxis_C48C0E05F2182734480D29FA89E2E346_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentAxis_C48C0E05F2182734480D29FA89E2E346" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt Instrument </link:label>
<link:label id="lab_us-gaap_DebtInstrumentAxis_C48C0E05F2182734480D29FA89E2E346_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentAxis_C48C0E05F2182734480D29FA89E2E346" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_C48C0E05F2182734480D29FA89E2E346" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentAxis_C48C0E05F2182734480D29FA89E2E346" xlink:to="lab_us-gaap_DebtInstrumentAxis_C48C0E05F2182734480D29FA89E2E346" xlink:type="arc"/>
<link:label id="lab_us-gaap_DebtInstrumentNameDomain_E626DC13A975998A0E7629FA89E2FEE0_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentNameDomain_E626DC13A975998A0E7629FA89E2FEE0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Name </link:label>
<link:label id="lab_us-gaap_DebtInstrumentNameDomain_E626DC13A975998A0E7629FA89E2FEE0_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentNameDomain_E626DC13A975998A0E7629FA89E2FEE0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Name [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_E626DC13A975998A0E7629FA89E2FEE0" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_E626DC13A975998A0E7629FA89E2FEE0" xlink:to="lab_us-gaap_DebtInstrumentNameDomain_E626DC13A975998A0E7629FA89E2FEE0" xlink:type="arc"/>
<link:label id="lab_powl_AmendedAndRestatedCreditAgreementMember_44A3B2CE75E1EDF90C9F29FA89E3EBEB_terseLabel_en-US" xlink:label="lab_powl_AmendedAndRestatedCreditAgreementMember_44A3B2CE75E1EDF90C9F29FA89E3EBEB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Amended and Restated Credit Agreement </link:label>
<link:label id="lab_powl_AmendedAndRestatedCreditAgreementMember_44A3B2CE75E1EDF90C9F29FA89E3EBEB_label_en-US" xlink:label="lab_powl_AmendedAndRestatedCreditAgreementMember_44A3B2CE75E1EDF90C9F29FA89E3EBEB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Amended And Restated Credit Agreement [Member] </link:label>
<link:label id="lab_powl_AmendedAndRestatedCreditAgreementMember_44A3B2CE75E1EDF90C9F29FA89E3EBEB_documentation_en-US" xlink:label="lab_powl_AmendedAndRestatedCreditAgreementMember_44A3B2CE75E1EDF90C9F29FA89E3EBEB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Amended And Restated Credit Agreement [Member] </link:label>
<link:loc xlink:href="powl-20200630.xsd#powl_AmendedAndRestatedCreditAgreementMember" xlink:label="loc_powl_AmendedAndRestatedCreditAgreementMember_44A3B2CE75E1EDF90C9F29FA89E3EBEB" xlink:type="locator"/>
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<link:label id="lab_us-gaap_GuaranteeObligationsByNatureAxis_7F9A8FC82CCCEAA9E0A529FA89E39269_terseLabel_en-US" xlink:label="lab_us-gaap_GuaranteeObligationsByNatureAxis_7F9A8FC82CCCEAA9E0A529FA89E39269" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Guarantor Obligations, Nature </link:label>
<link:label id="lab_us-gaap_GuaranteeObligationsByNatureAxis_7F9A8FC82CCCEAA9E0A529FA89E39269_label_en-US" xlink:label="lab_us-gaap_GuaranteeObligationsByNatureAxis_7F9A8FC82CCCEAA9E0A529FA89E39269" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Guarantor Obligations, Nature [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GuaranteeObligationsByNatureAxis" xlink:label="loc_us-gaap_GuaranteeObligationsByNatureAxis_7F9A8FC82CCCEAA9E0A529FA89E39269" xlink:type="locator"/>
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<link:label id="lab_us-gaap_GuaranteeObligationsNatureDomain_CFD79ACD5DD86F5A240029FA89E3A2C5_terseLabel_en-US" xlink:label="lab_us-gaap_GuaranteeObligationsNatureDomain_CFD79ACD5DD86F5A240029FA89E3A2C5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Guarantor Obligations, Nature </link:label>
<link:label id="lab_us-gaap_GuaranteeObligationsNatureDomain_CFD79ACD5DD86F5A240029FA89E3A2C5_label_en-US" xlink:label="lab_us-gaap_GuaranteeObligationsNatureDomain_CFD79ACD5DD86F5A240029FA89E3A2C5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Guarantor Obligations, Nature [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GuaranteeObligationsNatureDomain" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_CFD79ACD5DD86F5A240029FA89E3A2C5" xlink:type="locator"/>
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<link:label id="lab_us-gaap_FinancialStandbyLetterOfCreditMember_22A02846A0971580974429FA89E427A5_terseLabel_en-US" xlink:label="lab_us-gaap_FinancialStandbyLetterOfCreditMember_22A02846A0971580974429FA89E427A5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Financial Standby Letter of Credit </link:label>
<link:label id="lab_us-gaap_FinancialStandbyLetterOfCreditMember_22A02846A0971580974429FA89E427A5_label_en-US" xlink:label="lab_us-gaap_FinancialStandbyLetterOfCreditMember_22A02846A0971580974429FA89E427A5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Financial Standby Letter of Credit [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialStandbyLetterOfCreditMember" xlink:label="loc_us-gaap_FinancialStandbyLetterOfCreditMember_22A02846A0971580974429FA89E427A5" xlink:type="locator"/>
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<link:label id="lab_us-gaap_VariableRateAxis_30155F830D9F931C03FC29FA89E48BDB_terseLabel_en-US" xlink:label="lab_us-gaap_VariableRateAxis_30155F830D9F931C03FC29FA89E48BDB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Variable Rate </link:label>
<link:label id="lab_us-gaap_VariableRateAxis_30155F830D9F931C03FC29FA89E48BDB_label_en-US" xlink:label="lab_us-gaap_VariableRateAxis_30155F830D9F931C03FC29FA89E48BDB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Variable Rate [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_VariableRateAxis" xlink:label="loc_us-gaap_VariableRateAxis_30155F830D9F931C03FC29FA89E48BDB" xlink:type="locator"/>
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<link:label id="lab_us-gaap_VariableRateDomain_559CE3E703C9E709588429FA89E4A33F_terseLabel_en-US" xlink:label="lab_us-gaap_VariableRateDomain_559CE3E703C9E709588429FA89E4A33F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Variable Rate </link:label>
<link:label id="lab_us-gaap_VariableRateDomain_559CE3E703C9E709588429FA89E4A33F_label_en-US" xlink:label="lab_us-gaap_VariableRateDomain_559CE3E703C9E709588429FA89E4A33F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Variable Rate [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_559CE3E703C9E709588429FA89E4A33F" xlink:type="locator"/>
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<link:label id="lab_us-gaap_FederalFundsEffectiveSwapRateMember_AABDA324447E4E6DDCBE29FA89E42421_terseLabel_en-US" xlink:label="lab_us-gaap_FederalFundsEffectiveSwapRateMember_AABDA324447E4E6DDCBE29FA89E42421" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fed Funds Rate </link:label>
<link:label id="lab_us-gaap_FederalFundsEffectiveSwapRateMember_AABDA324447E4E6DDCBE29FA89E42421_label_en-US" xlink:label="lab_us-gaap_FederalFundsEffectiveSwapRateMember_AABDA324447E4E6DDCBE29FA89E42421" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Fed Funds Effective Rate Overnight Index Swap Rate [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FederalFundsEffectiveSwapRateMember" xlink:label="loc_us-gaap_FederalFundsEffectiveSwapRateMember_AABDA324447E4E6DDCBE29FA89E42421" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_6AC57738028535EEC35929FA89E4C558_label_en-US" xlink:label="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_6AC57738028535EEC35929FA89E4C558" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> London Interbank Offered Rate (LIBOR) [Member] </link:label>
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<link:label id="lab_us-gaap_BaseRateMember_3C6A436320742CC10C4D29FA89E5C90A_terseLabel_en-US" xlink:label="lab_us-gaap_BaseRateMember_3C6A436320742CC10C4D29FA89E5C90A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Base Rate </link:label>
<link:label id="lab_us-gaap_BaseRateMember_3C6A436320742CC10C4D29FA89E5C90A_label_en-US" xlink:label="lab_us-gaap_BaseRateMember_3C6A436320742CC10C4D29FA89E5C90A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Base Rate [Member] </link:label>
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<link:label id="lab_srt_RangeMember_6102939459C453653C4029FA89E5D721_terseLabel_en-US" xlink:label="lab_srt_RangeMember_6102939459C453653C4029FA89E5D721" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Range </link:label>
<link:label id="lab_srt_RangeMember_6102939459C453653C4029FA89E5D721_label_en-US" xlink:label="lab_srt_RangeMember_6102939459C453653C4029FA89E5D721" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Statistical Measurement [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_6102939459C453653C4029FA89E5D721" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_RangeMember_6102939459C453653C4029FA89E5D721" xlink:to="lab_srt_RangeMember_6102939459C453653C4029FA89E5D721" xlink:type="arc"/>
<link:label id="lab_srt_MinimumMember_599F26586916A49E4F1029FA89E539BB_terseLabel_en-US" xlink:label="lab_srt_MinimumMember_599F26586916A49E4F1029FA89E539BB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Minimum </link:label>
<link:label id="lab_srt_MinimumMember_599F26586916A49E4F1029FA89E539BB_label_en-US" xlink:label="lab_srt_MinimumMember_599F26586916A49E4F1029FA89E539BB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Minimum [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_599F26586916A49E4F1029FA89E539BB" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_MinimumMember_599F26586916A49E4F1029FA89E539BB" xlink:to="lab_srt_MinimumMember_599F26586916A49E4F1029FA89E539BB" xlink:type="arc"/>
<link:label id="lab_srt_MaximumMember_46E25C58419917DB4A7E29FA89E60BAD_terseLabel_en-US" xlink:label="lab_srt_MaximumMember_46E25C58419917DB4A7E29FA89E60BAD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Maximum </link:label>
<link:label id="lab_srt_MaximumMember_46E25C58419917DB4A7E29FA89E60BAD_label_en-US" xlink:label="lab_srt_MaximumMember_46E25C58419917DB4A7E29FA89E60BAD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Maximum [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_46E25C58419917DB4A7E29FA89E60BAD" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_MaximumMember_46E25C58419917DB4A7E29FA89E60BAD" xlink:to="lab_srt_MaximumMember_46E25C58419917DB4A7E29FA89E60BAD" xlink:type="arc"/>
<link:label id="lab_us-gaap_LineOfCreditFacilityLineItems_5B2C4C97586D8C0B217129FA89E6973B_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityLineItems_5B2C4C97586D8C0B217129FA89E6973B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Line Of Credit Facility [Line Items] </link:label>
<link:label id="lab_us-gaap_LineOfCreditFacilityLineItems_5B2C4C97586D8C0B217129FA89E6973B_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityLineItems_5B2C4C97586D8C0B217129FA89E6973B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCreditFacilityLineItems" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_5B2C4C97586D8C0B217129FA89E6973B" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_5B2C4C97586D8C0B217129FA89E6973B" xlink:to="lab_us-gaap_LineOfCreditFacilityLineItems_5B2C4C97586D8C0B217129FA89E6973B" xlink:type="arc"/>
<link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2A8CF7F6B5AE73F3171F29FA89E625D5_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2A8CF7F6B5AE73F3171F29FA89E625D5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Revolving credit facility </link:label>
<link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2A8CF7F6B5AE73F3171F29FA89E625D5_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2A8CF7F6B5AE73F3171F29FA89E625D5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Maximum Borrowing Capacity </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2A8CF7F6B5AE73F3171F29FA89E625D5" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2A8CF7F6B5AE73F3171F29FA89E625D5" xlink:to="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2A8CF7F6B5AE73F3171F29FA89E625D5" xlink:type="arc"/>
<link:label id="lab_us-gaap_LongTermDebt_FDBD3ED080A1B2BFA88129FA89E738B9_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebt_FDBD3ED080A1B2BFA88129FA89E738B9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Revolving credit facility borrowings, outstanding amount </link:label>
<link:label id="lab_us-gaap_LongTermDebt_FDBD3ED080A1B2BFA88129FA89E738B9_label_en-US" xlink:label="lab_us-gaap_LongTermDebt_FDBD3ED080A1B2BFA88129FA89E738B9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Long-term Debt </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_FDBD3ED080A1B2BFA88129FA89E738B9" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebt_FDBD3ED080A1B2BFA88129FA89E738B9" xlink:to="lab_us-gaap_LongTermDebt_FDBD3ED080A1B2BFA88129FA89E738B9" xlink:type="arc"/>
<link:label id="lab_us-gaap_GuaranteeObligationsCurrentCarryingValue_1E7D68B6FB055DFA642A29FA89E7D6D9_terseLabel_en-US" xlink:label="lab_us-gaap_GuaranteeObligationsCurrentCarryingValue_1E7D68B6FB055DFA642A29FA89E7D6D9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Guarantee liability </link:label>
<link:label id="lab_us-gaap_GuaranteeObligationsCurrentCarryingValue_1E7D68B6FB055DFA642A29FA89E7D6D9_label_en-US" xlink:label="lab_us-gaap_GuaranteeObligationsCurrentCarryingValue_1E7D68B6FB055DFA642A29FA89E7D6D9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Guarantor Obligations, Current Carrying Value </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GuaranteeObligationsCurrentCarryingValue" xlink:label="loc_us-gaap_GuaranteeObligationsCurrentCarryingValue_1E7D68B6FB055DFA642A29FA89E7D6D9" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GuaranteeObligationsCurrentCarryingValue_1E7D68B6FB055DFA642A29FA89E7D6D9" xlink:to="lab_us-gaap_GuaranteeObligationsCurrentCarryingValue_1E7D68B6FB055DFA642A29FA89E7D6D9" xlink:type="arc"/>
<link:label id="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_15B48559724B154B05AF29FA89E76973_verboseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_15B48559724B154B05AF29FA89E76973" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Amount available under the credit facility </link:label>
<link:label id="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_15B48559724B154B05AF29FA89E76973_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_15B48559724B154B05AF29FA89E76973" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Remaining Borrowing Capacity </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_15B48559724B154B05AF29FA89E76973" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_15B48559724B154B05AF29FA89E76973" xlink:to="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_15B48559724B154B05AF29FA89E76973" xlink:type="arc"/>
<link:label id="lab_powl_DebtInstrumentCovenantLeverageRatioMaximumAllowed_F800BCFE5B36459E103629FA89E8CCC2_terseLabel_en-US" xlink:label="lab_powl_DebtInstrumentCovenantLeverageRatioMaximumAllowed_F800BCFE5B36459E103629FA89E8CCC2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt covenant, consolidated leverage ratio (less than) </link:label>
<link:label id="lab_powl_DebtInstrumentCovenantLeverageRatioMaximumAllowed_F800BCFE5B36459E103629FA89E8CCC2_label_en-US" xlink:label="lab_powl_DebtInstrumentCovenantLeverageRatioMaximumAllowed_F800BCFE5B36459E103629FA89E8CCC2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Covenant, Leverage Ratio, Maximum Allowed </link:label>
<link:label id="lab_powl_DebtInstrumentCovenantLeverageRatioMaximumAllowed_F800BCFE5B36459E103629FA89E8CCC2_documentation_en-US" xlink:label="lab_powl_DebtInstrumentCovenantLeverageRatioMaximumAllowed_F800BCFE5B36459E103629FA89E8CCC2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Covenant, Leverage Ratio, Maximum allowed </link:label>
<link:loc xlink:href="powl-20200630.xsd#powl_DebtInstrumentCovenantLeverageRatioMaximumAllowed" xlink:label="loc_powl_DebtInstrumentCovenantLeverageRatioMaximumAllowed_F800BCFE5B36459E103629FA89E8CCC2" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_powl_DebtInstrumentCovenantLeverageRatioMaximumAllowed_F800BCFE5B36459E103629FA89E8CCC2" xlink:to="lab_powl_DebtInstrumentCovenantLeverageRatioMaximumAllowed_F800BCFE5B36459E103629FA89E8CCC2" xlink:type="arc"/>
<link:label id="lab_powl_DebtInstrumentCovenantInterestCoverageRatioMinimum_4064FBA590C4822B5CFB29FA89E89978_terseLabel_en-US" xlink:label="lab_powl_DebtInstrumentCovenantInterestCoverageRatioMinimum_4064FBA590C4822B5CFB29FA89E89978" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt covenant, consolidated interest coverage ratio (greater than) </link:label>
<link:label id="lab_powl_DebtInstrumentCovenantInterestCoverageRatioMinimum_4064FBA590C4822B5CFB29FA89E89978_label_en-US" xlink:label="lab_powl_DebtInstrumentCovenantInterestCoverageRatioMinimum_4064FBA590C4822B5CFB29FA89E89978" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Covenant, Interest Coverage Ratio, Minimum </link:label>
<link:label id="lab_powl_DebtInstrumentCovenantInterestCoverageRatioMinimum_4064FBA590C4822B5CFB29FA89E89978_documentation_en-US" xlink:label="lab_powl_DebtInstrumentCovenantInterestCoverageRatioMinimum_4064FBA590C4822B5CFB29FA89E89978" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Covenant, Interest Coverage Ratio, Minimum </link:label>
<link:loc xlink:href="powl-20200630.xsd#powl_DebtInstrumentCovenantInterestCoverageRatioMinimum" xlink:label="loc_powl_DebtInstrumentCovenantInterestCoverageRatioMinimum_4064FBA590C4822B5CFB29FA89E89978" xlink:type="locator"/>
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<link:label id="lab_powl_LineOfCreditFacilityCollateralAmount_E32F447D9D8D9EFCEAEE29FA89E8F63E_terseLabel_en-US" xlink:label="lab_powl_LineOfCreditFacilityCollateralAmount_E32F447D9D8D9EFCEAEE29FA89E8F63E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cash collateral pledged balance </link:label>
<link:label id="lab_powl_LineOfCreditFacilityCollateralAmount_E32F447D9D8D9EFCEAEE29FA89E8F63E_label_en-US" xlink:label="lab_powl_LineOfCreditFacilityCollateralAmount_E32F447D9D8D9EFCEAEE29FA89E8F63E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line Of Credit Facility, Collateral Amount </link:label>
<link:label id="lab_powl_LineOfCreditFacilityCollateralAmount_E32F447D9D8D9EFCEAEE29FA89E8F63E_documentation_en-US" xlink:label="lab_powl_LineOfCreditFacilityCollateralAmount_E32F447D9D8D9EFCEAEE29FA89E8F63E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Line Of Credit Facility, Collateral Amount </link:label>
<link:loc xlink:href="powl-20200630.xsd#powl_LineOfCreditFacilityCollateralAmount" xlink:label="loc_powl_LineOfCreditFacilityCollateralAmount_E32F447D9D8D9EFCEAEE29FA89E8F63E" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_6F6A24DD687CD46150D829FA89E832E0_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_6F6A24DD687CD46150D829FA89E832E0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Basis spread on variable rate </link:label>
<link:label id="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_6F6A24DD687CD46150D829FA89E832E0_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_6F6A24DD687CD46150D829FA89E832E0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Basis Spread on Variable Rate </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_6F6A24DD687CD46150D829FA89E832E0" xlink:type="locator"/>
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<link:label id="lab_powl_PercentageOfDomesticCapitalStockPledgedAsCollateralForCreditFacility_DADB939496F06E57D78D29FA89E8FDDF_terseLabel_en-US" xlink:label="lab_powl_PercentageOfDomesticCapitalStockPledgedAsCollateralForCreditFacility_DADB939496F06E57D78D29FA89E8FDDF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Percentage of voting capital stock pledged as collateral </link:label>
<link:label id="lab_powl_PercentageOfDomesticCapitalStockPledgedAsCollateralForCreditFacility_DADB939496F06E57D78D29FA89E8FDDF_label_en-US" xlink:label="lab_powl_PercentageOfDomesticCapitalStockPledgedAsCollateralForCreditFacility_DADB939496F06E57D78D29FA89E8FDDF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Percentage Of Domestic Capital Stock Pledged As Collateral For Credit Facility </link:label>
<link:label id="lab_powl_PercentageOfDomesticCapitalStockPledgedAsCollateralForCreditFacility_DADB939496F06E57D78D29FA89E8FDDF_documentation_en-US" xlink:label="lab_powl_PercentageOfDomesticCapitalStockPledgedAsCollateralForCreditFacility_DADB939496F06E57D78D29FA89E8FDDF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Percentage of domestic capital stock pledged as collateral for credit facility. </link:label>
<link:loc xlink:href="powl-20200630.xsd#powl_PercentageOfDomesticCapitalStockPledgedAsCollateralForCreditFacility" xlink:label="loc_powl_PercentageOfDomesticCapitalStockPledgedAsCollateralForCreditFacility_DADB939496F06E57D78D29FA89E8FDDF" xlink:type="locator"/>
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<link:label id="lab_powl_PercentageOfNonDomesticCapitalStockPledgedAsCollateralForCreditFacility_1A903E6FACDFBFF1DA0A29FA89E9CE2E_terseLabel_en-US" xlink:label="lab_powl_PercentageOfNonDomesticCapitalStockPledgedAsCollateralForCreditFacility_1A903E6FACDFBFF1DA0A29FA89E9CE2E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Non-domestic subsidiaries of voting capital stock </link:label>
<link:label id="lab_powl_PercentageOfNonDomesticCapitalStockPledgedAsCollateralForCreditFacility_1A903E6FACDFBFF1DA0A29FA89E9CE2E_label_en-US" xlink:label="lab_powl_PercentageOfNonDomesticCapitalStockPledgedAsCollateralForCreditFacility_1A903E6FACDFBFF1DA0A29FA89E9CE2E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Percentage Of Non Domestic Capital Stock Pledged As Collateral For Credit Facility </link:label>
<link:label id="lab_powl_PercentageOfNonDomesticCapitalStockPledgedAsCollateralForCreditFacility_1A903E6FACDFBFF1DA0A29FA89E9CE2E_documentation_en-US" xlink:label="lab_powl_PercentageOfNonDomesticCapitalStockPledgedAsCollateralForCreditFacility_1A903E6FACDFBFF1DA0A29FA89E9CE2E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Percentage of non domestic capital stock pledged as collateral for credit facility. </link:label>
<link:loc xlink:href="powl-20200630.xsd#powl_PercentageOfNonDomesticCapitalStockPledgedAsCollateralForCreditFacility" xlink:label="loc_powl_PercentageOfNonDomesticCapitalStockPledgedAsCollateralForCreditFacility_1A903E6FACDFBFF1DA0A29FA89E9CE2E" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DebtInstrumentFaceAmount_D15B6BAA4EB148366B6B29FA89E936EA_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_D15B6BAA4EB148366B6B29FA89E936EA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Borrowings </link:label>
<link:label id="lab_us-gaap_DebtInstrumentFaceAmount_D15B6BAA4EB148366B6B29FA89E936EA_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_D15B6BAA4EB148366B6B29FA89E936EA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Face Amount </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_D15B6BAA4EB148366B6B29FA89E936EA" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DebtInstrumentAnnualPrincipalPayment_670455A47EBD37883D5C29FA89E93CD3_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentAnnualPrincipalPayment_670455A47EBD37883D5C29FA89E93CD3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Reimbursement agreement requires annual redemptions </link:label>
<link:label id="lab_us-gaap_DebtInstrumentAnnualPrincipalPayment_670455A47EBD37883D5C29FA89E93CD3_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentAnnualPrincipalPayment_670455A47EBD37883D5C29FA89E93CD3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Annual Principal Payment </link:label>
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<link:label id="lab_us-gaap_DebtInstrumentInterestRateEffectivePercentage_C9A6951B16C0CD332C8E29FA89E9B0C3_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateEffectivePercentage_C9A6951B16C0CD332C8E29FA89E9B0C3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Interest rate </link:label>
<link:label id="lab_us-gaap_DebtInstrumentInterestRateEffectivePercentage_C9A6951B16C0CD332C8E29FA89E9B0C3_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateEffectivePercentage_C9A6951B16C0CD332C8E29FA89E9B0C3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Interest Rate, Effective Percentage </link:label>
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<link:label id="lab_us-gaap_StatementOfStockholdersEquityAbstract_A9987588F56AB8AB51669269E22BFB43_label_en-US" xlink:label="lab_us-gaap_StatementOfStockholdersEquityAbstract_A9987588F56AB8AB51669269E22BFB43" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Statement of Stockholders' Equity [Abstract] </link:label>
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<link:label id="lab_us-gaap_StatementTable_81E7253D969D35DFE96B9269E22BD4F7_terseLabel_en-US" xlink:label="lab_us-gaap_StatementTable_81E7253D969D35DFE96B9269E22BD4F7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Statement [Table] </link:label>
<link:label id="lab_us-gaap_StatementTable_81E7253D969D35DFE96B9269E22BD4F7_label_en-US" xlink:label="lab_us-gaap_StatementTable_81E7253D969D35DFE96B9269E22BD4F7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Statement [Table] </link:label>
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<link:label id="lab_us-gaap_StatementEquityComponentsAxis_D2A1D5AD5B17A02EF2DB9269E22B555E_terseLabel_en-US" xlink:label="lab_us-gaap_StatementEquityComponentsAxis_D2A1D5AD5B17A02EF2DB9269E22B555E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Equity Components [Axis] </link:label>
<link:label id="lab_us-gaap_StatementEquityComponentsAxis_D2A1D5AD5B17A02EF2DB9269E22B555E_label_en-US" xlink:label="lab_us-gaap_StatementEquityComponentsAxis_D2A1D5AD5B17A02EF2DB9269E22B555E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Equity Components [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_D2A1D5AD5B17A02EF2DB9269E22B555E" xlink:type="locator"/>
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<link:label id="lab_us-gaap_EquityComponentDomain_6984FBBF8108A04AA3569269E22BC5D6_terseLabel_en-US" xlink:label="lab_us-gaap_EquityComponentDomain_6984FBBF8108A04AA3569269E22BC5D6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Equity Component [Domain] </link:label>
<link:label id="lab_us-gaap_EquityComponentDomain_6984FBBF8108A04AA3569269E22BC5D6_label_en-US" xlink:label="lab_us-gaap_EquityComponentDomain_6984FBBF8108A04AA3569269E22BC5D6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Equity Component [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_6984FBBF8108A04AA3569269E22BC5D6" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CommonStockMember_9804D8F2385E9F4FD6AD9269E22B15C1_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockMember_9804D8F2385E9F4FD6AD9269E22B15C1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Common Stock </link:label>
<link:label id="lab_us-gaap_CommonStockMember_9804D8F2385E9F4FD6AD9269E22B15C1_label_en-US" xlink:label="lab_us-gaap_CommonStockMember_9804D8F2385E9F4FD6AD9269E22B15C1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Common Stock [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_9804D8F2385E9F4FD6AD9269E22B15C1" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AdditionalPaidInCapitalMember_49F2569E573C35884A2C9269E23AB23D_terseLabel_en-US" xlink:label="lab_us-gaap_AdditionalPaidInCapitalMember_49F2569E573C35884A2C9269E23AB23D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Additional Paid-in Capital </link:label>
<link:label id="lab_us-gaap_AdditionalPaidInCapitalMember_49F2569E573C35884A2C9269E23AB23D_label_en-US" xlink:label="lab_us-gaap_AdditionalPaidInCapitalMember_49F2569E573C35884A2C9269E23AB23D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Additional Paid-in Capital [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_49F2569E573C35884A2C9269E23AB23D" xlink:type="locator"/>
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<link:label id="lab_us-gaap_RetainedEarningsMember_5A38C802C7F7F37AAE779269E23A13CE_terseLabel_en-US" xlink:label="lab_us-gaap_RetainedEarningsMember_5A38C802C7F7F37AAE779269E23A13CE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Retained Earnings </link:label>
<link:label id="lab_us-gaap_RetainedEarningsMember_5A38C802C7F7F37AAE779269E23A13CE_label_en-US" xlink:label="lab_us-gaap_RetainedEarningsMember_5A38C802C7F7F37AAE779269E23A13CE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Retained Earnings [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="loc_us-gaap_RetainedEarningsMember_5A38C802C7F7F37AAE779269E23A13CE" xlink:type="locator"/>
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<link:label id="lab_us-gaap_TreasuryStockMember_9F77A4F6B106679A4B2E9269E23A3D74_terseLabel_en-US" xlink:label="lab_us-gaap_TreasuryStockMember_9F77A4F6B106679A4B2E9269E23A3D74" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Treasury Stock </link:label>
<link:label id="lab_us-gaap_TreasuryStockMember_9F77A4F6B106679A4B2E9269E23A3D74_label_en-US" xlink:label="lab_us-gaap_TreasuryStockMember_9F77A4F6B106679A4B2E9269E23A3D74" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Treasury Stock [Member] </link:label>
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<link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_158E73BE455F6F6B01A19269E23A9542_terseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_158E73BE455F6F6B01A19269E23A9542" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accumulated Other Comprehensive Income/(Loss) </link:label>
<link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_158E73BE455F6F6B01A19269E23A9542_label_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_158E73BE455F6F6B01A19269E23A9542" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> AOCI Attributable to Parent [Member] </link:label>
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<link:label id="lab_us-gaap_StatementLineItems_940D7BC25F36203CDA039269E23AAAB1_terseLabel_en-US" xlink:label="lab_us-gaap_StatementLineItems_940D7BC25F36203CDA039269E23AAAB1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Statement [Line Items] </link:label>
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<link:label id="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0E7947B8232B2EC0C8739269E23A383B_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0E7947B8232B2EC0C8739269E23A383B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Stockholders' Equity [Roll Forward] </link:label>
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<link:label id="lab_us-gaap_NetIncomeLoss_1BE0255EF19546A2E7CE9269E23A3D4E_terseLabel_en-US" xlink:label="lab_us-gaap_NetIncomeLoss_1BE0255EF19546A2E7CE9269E23A3D4E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Net (loss) income </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_1BE0255EF19546A2E7CE9269E23A3D4E" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_EDA781463DE562D966659269E23A2E49_verboseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_EDA781463DE562D966659269E23A2E49" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Foreign currency translation adjustments </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_EDA781463DE562D966659269E23A2E49" xlink:type="locator"/>
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<link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_D86784B8357AC3D224B59269E23AABFF_terseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_D86784B8357AC3D224B59269E23AABFF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stock-based compensation (in shares) </link:label>
<link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_D86784B8357AC3D224B59269E23AABFF_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_D86784B8357AC3D224B59269E23AABFF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_D86784B8357AC3D224B59269E23AABFF" xlink:type="locator"/>
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<link:label id="lab_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_9707D7D794F48300FACB9269E23A44EA_terseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_9707D7D794F48300FACB9269E23A44EA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stock-based compensation </link:label>
<link:label id="lab_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_9707D7D794F48300FACB9269E23A44EA_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_9707D7D794F48300FACB9269E23A44EA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_9707D7D794F48300FACB9269E23A44EA" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_0C66230BEDB45C75EBD29269E23A7FC4_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_0C66230BEDB45C75EBD29269E23A7FC4" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Shares withheld in lieu of employee tax withholding </link:label>
<link:label id="lab_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_0C66230BEDB45C75EBD29269E23A7FC4_label_en-US" xlink:label="lab_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_0C66230BEDB45C75EBD29269E23A7FC4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Payment Arrangement, Decrease for Tax Withholding Obligation </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_0C66230BEDB45C75EBD29269E23A7FC4" xlink:type="locator"/>
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<link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_DF5FDB3E587C1EEA45759269E23AB506_terseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_DF5FDB3E587C1EEA45759269E23AB506" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Issuance of restricted stock (in shares) </link:label>
<link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_DF5FDB3E587C1EEA45759269E23AB506_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_DF5FDB3E587C1EEA45759269E23AB506" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_DF5FDB3E587C1EEA45759269E23AB506" xlink:type="locator"/>
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<link:label id="lab_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_42B46E20B56780F0E3F79269E23A880F_terseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_42B46E20B56780F0E3F79269E23A880F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Issuance of restricted stock </link:label>
<link:label id="lab_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_42B46E20B56780F0E3F79269E23A880F_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_42B46E20B56780F0E3F79269E23A880F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_42B46E20B56780F0E3F79269E23A880F" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DividendsCommonStockCash_51AD96238AA6BEB876789269E23A2A7B_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_DividendsCommonStockCash_51AD96238AA6BEB876789269E23A2A7B" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Dividends paid </link:label>
<link:label id="lab_us-gaap_DividendsCommonStockCash_51AD96238AA6BEB876789269E23A2A7B_label_en-US" xlink:label="lab_us-gaap_DividendsCommonStockCash_51AD96238AA6BEB876789269E23A2A7B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Dividends, Common Stock, Cash </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DividendsCommonStockCash" xlink:label="loc_us-gaap_DividendsCommonStockCash_51AD96238AA6BEB876789269E23A2A7B" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CommonStockSharesOutstanding_8733031DFBFC8254B9FE9269E23AC2E9_periodEndLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesOutstanding_8733031DFBFC8254B9FE9269E23AC2E9" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US"> Balance (in shares) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_8733031DFBFC8254B9FE9269E23AC2E9" xlink:type="locator"/>
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<link:label id="lab_us-gaap_StockholdersEquity_0A7F10F0B21B8D6EE4749269E23AC1AB_periodEndLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquity_0A7F10F0B21B8D6EE4749269E23AC1AB" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US"> Balance </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_0A7F10F0B21B8D6EE4749269E23AC1AB" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LeasesAbstract_AE81C74AA5DD2F2D288EE7F79FE72561_label_en-US" xlink:label="lab_us-gaap_LeasesAbstract_AE81C74AA5DD2F2D288EE7F79FE72561" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Leases [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeasesAbstract" xlink:label="loc_us-gaap_LeasesAbstract_AE81C74AA5DD2F2D288EE7F79FE72561" xlink:type="locator"/>
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<link:label id="lab_powl_OperatingLeaseRightOfUseAssetLeaseAccrual_3762A64D7C2493A8F579E7F79FE7606C_terseLabel_en-US" xlink:label="lab_powl_OperatingLeaseRightOfUseAssetLeaseAccrual_3762A64D7C2493A8F579E7F79FE7606C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Lease accrual </link:label>
<link:label id="lab_powl_OperatingLeaseRightOfUseAssetLeaseAccrual_3762A64D7C2493A8F579E7F79FE7606C_label_en-US" xlink:label="lab_powl_OperatingLeaseRightOfUseAssetLeaseAccrual_3762A64D7C2493A8F579E7F79FE7606C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Right-Of-Use Asset, Lease Accrual </link:label>
<link:label id="lab_powl_OperatingLeaseRightOfUseAssetLeaseAccrual_3762A64D7C2493A8F579E7F79FE7606C_documentation_en-US" xlink:label="lab_powl_OperatingLeaseRightOfUseAssetLeaseAccrual_3762A64D7C2493A8F579E7F79FE7606C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Operating Lease, Right-Of-Use Asset, Lease Accrual </link:label>
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<link:label id="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_468C6E8AC6CBAC697D8EE7F79FE75700_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_468C6E8AC6CBAC697D8EE7F79FE75700" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Weighted average discount rate, percent </link:label>
<link:label id="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_468C6E8AC6CBAC697D8EE7F79FE75700_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_468C6E8AC6CBAC697D8EE7F79FE75700" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Weighted Average Discount Rate, Percent </link:label>
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<link:label id="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_94C160EB6772B022B01BE7F79FE70727_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_94C160EB6772B022B01BE7F79FE70727" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Weighted average remaining lease term </link:label>
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<link:label id="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_9285054C2C30461CAFC9E7F7A039CB5D_terseLabel_en-US" xlink:label="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_9285054C2C30461CAFC9E7F7A039CB5D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accounts Receivable, Allowance for Credit Loss [Roll Forward] </link:label>
<link:label id="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_9285054C2C30461CAFC9E7F7A039CB5D_label_en-US" xlink:label="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_9285054C2C30461CAFC9E7F7A039CB5D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accounts Receivable, Allowance for Credit Loss [Roll Forward] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_9285054C2C30461CAFC9E7F7A039CB5D" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_0ABB62F2140A228B2914E7F7A03AEC32_periodStartLabel_en-US" xlink:label="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_0ABB62F2140A228B2914E7F7A03AEC32" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US"> Balance at beginning of period </link:label>
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<link:label id="lab_us-gaap_ProvisionForDoubtfulAccounts_DCDFD6F9FDC110A46692E7F7A03A281E_verboseLabel_en-US" xlink:label="lab_us-gaap_ProvisionForDoubtfulAccounts_DCDFD6F9FDC110A46692E7F7A03A281E" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Bad debt expense </link:label>
<link:label id="lab_us-gaap_ProvisionForDoubtfulAccounts_DCDFD6F9FDC110A46692E7F7A03A281E_label_en-US" xlink:label="lab_us-gaap_ProvisionForDoubtfulAccounts_DCDFD6F9FDC110A46692E7F7A03A281E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accounts Receivable, Credit Loss Expense (Reversal) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProvisionForDoubtfulAccounts" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_DCDFD6F9FDC110A46692E7F7A03A281E" xlink:type="locator"/>
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<link:label id="lab_powl_AllowanceForDoubtfulAccountsReceivableWriteOffsRecoveries_9D59BD93CB72875F263AE7F7A03A962C_negatedLabel_en-US" xlink:label="lab_powl_AllowanceForDoubtfulAccountsReceivableWriteOffsRecoveries_9D59BD93CB72875F263AE7F7A03A962C" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Uncollectible accounts written off, net of recoveries </link:label>
<link:label id="lab_powl_AllowanceForDoubtfulAccountsReceivableWriteOffsRecoveries_9D59BD93CB72875F263AE7F7A03A962C_label_en-US" xlink:label="lab_powl_AllowanceForDoubtfulAccountsReceivableWriteOffsRecoveries_9D59BD93CB72875F263AE7F7A03A962C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Allowance For Doubtful Accounts Receivable Write Offs Recoveries </link:label>
<link:label id="lab_powl_AllowanceForDoubtfulAccountsReceivableWriteOffsRecoveries_9D59BD93CB72875F263AE7F7A03A962C_documentation_en-US" xlink:label="lab_powl_AllowanceForDoubtfulAccountsReceivableWriteOffsRecoveries_9D59BD93CB72875F263AE7F7A03A962C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Allowance for doubtful accounts receivable write offs (recoveries). </link:label>
<link:loc xlink:href="powl-20200630.xsd#powl_AllowanceForDoubtfulAccountsReceivableWriteOffsRecoveries" xlink:label="loc_powl_AllowanceForDoubtfulAccountsReceivableWriteOffsRecoveries_9D59BD93CB72875F263AE7F7A03A962C" xlink:type="locator"/>
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<link:label id="lab_powl_IncreaseDecreaseDueToForeignCurrencyTranslation_996D48D102DDECE0D18EE7F7A03A68F4_terseLabel_en-US" xlink:label="lab_powl_IncreaseDecreaseDueToForeignCurrencyTranslation_996D48D102DDECE0D18EE7F7A03A68F4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Change due to foreign currency translation </link:label>
<link:label id="lab_powl_IncreaseDecreaseDueToForeignCurrencyTranslation_996D48D102DDECE0D18EE7F7A03A68F4_label_en-US" xlink:label="lab_powl_IncreaseDecreaseDueToForeignCurrencyTranslation_996D48D102DDECE0D18EE7F7A03A68F4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) Due To Foreign Currency Translation </link:label>
<link:label id="lab_powl_IncreaseDecreaseDueToForeignCurrencyTranslation_996D48D102DDECE0D18EE7F7A03A68F4_documentation_en-US" xlink:label="lab_powl_IncreaseDecreaseDueToForeignCurrencyTranslation_996D48D102DDECE0D18EE7F7A03A68F4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Increase (decrease) due to foreign currency translation. </link:label>
<link:loc xlink:href="powl-20200630.xsd#powl_IncreaseDecreaseDueToForeignCurrencyTranslation" xlink:label="loc_powl_IncreaseDecreaseDueToForeignCurrencyTranslation_996D48D102DDECE0D18EE7F7A03A68F4" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_8F8C36BB3D267F9C4FECE7F7A03A2371_periodEndLabel_en-US" xlink:label="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_8F8C36BB3D267F9C4FECE7F7A03A2371" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US"> Balance at end of period </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_8F8C36BB3D267F9C4FECE7F7A03A2371" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AssetsAndLiabilitiesLesseeAbstract_8ABE899CFCDF57273201E7F79FA80858_label_en-US" xlink:label="lab_us-gaap_AssetsAndLiabilitiesLesseeAbstract_8ABE899CFCDF57273201E7F79FA80858" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Assets and Liabilities, Lessee [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsAndLiabilitiesLesseeAbstract" xlink:label="loc_us-gaap_AssetsAndLiabilitiesLesseeAbstract_8ABE899CFCDF57273201E7F79FA80858" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetsAndLiabilitiesLesseeAbstract_8ABE899CFCDF57273201E7F79FA80858" xlink:to="lab_us-gaap_AssetsAndLiabilitiesLesseeAbstract_8ABE899CFCDF57273201E7F79FA80858" xlink:type="arc"/>
<link:label id="lab_powl_LeaseAssetsAbstractAbstract_2AF0DD44D61A6BAC6495E7F79FA82256_terseLabel_en-US" xlink:label="lab_powl_LeaseAssetsAbstractAbstract_2AF0DD44D61A6BAC6495E7F79FA82256" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Assets: </link:label>
<link:label id="lab_powl_LeaseAssetsAbstractAbstract_2AF0DD44D61A6BAC6495E7F79FA82256_label_en-US" xlink:label="lab_powl_LeaseAssetsAbstractAbstract_2AF0DD44D61A6BAC6495E7F79FA82256" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lease, Assets [Abstract] [Abstract] </link:label>
<link:label id="lab_powl_LeaseAssetsAbstractAbstract_2AF0DD44D61A6BAC6495E7F79FA82256_documentation_en-US" xlink:label="lab_powl_LeaseAssetsAbstractAbstract_2AF0DD44D61A6BAC6495E7F79FA82256" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Lease, Assets [Abstract] [Abstract] </link:label>
<link:loc xlink:href="powl-20200630.xsd#powl_LeaseAssetsAbstractAbstract" xlink:label="loc_powl_LeaseAssetsAbstractAbstract_2AF0DD44D61A6BAC6495E7F79FA82256" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OperatingLeaseRightOfUseAsset_E96962D80A4BF84B676AE7F79FA88D7D_verboseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseRightOfUseAsset_E96962D80A4BF84B676AE7F79FA88D7D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Operating lease assets, net </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_E96962D80A4BF84B676AE7F79FA88D7D" xlink:type="locator"/>
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<link:label id="lab_powl_LeaseLiabilitiesAbstract_0D8A3AC8CDC4CDB4B0EBE7F79FA8F567_terseLabel_en-US" xlink:label="lab_powl_LeaseLiabilitiesAbstract_0D8A3AC8CDC4CDB4B0EBE7F79FA8F567" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Liabilities: </link:label>
<link:label id="lab_powl_LeaseLiabilitiesAbstract_0D8A3AC8CDC4CDB4B0EBE7F79FA8F567_label_en-US" xlink:label="lab_powl_LeaseLiabilitiesAbstract_0D8A3AC8CDC4CDB4B0EBE7F79FA8F567" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lease, Liabilities [Abstract] </link:label>
<link:label id="lab_powl_LeaseLiabilitiesAbstract_0D8A3AC8CDC4CDB4B0EBE7F79FA8F567_documentation_en-US" xlink:label="lab_powl_LeaseLiabilitiesAbstract_0D8A3AC8CDC4CDB4B0EBE7F79FA8F567" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Lease, Liabilities [Abstract] </link:label>
<link:loc xlink:href="powl-20200630.xsd#powl_LeaseLiabilitiesAbstract" xlink:label="loc_powl_LeaseLiabilitiesAbstract_0D8A3AC8CDC4CDB4B0EBE7F79FA8F567" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_powl_LeaseLiabilitiesAbstract_0D8A3AC8CDC4CDB4B0EBE7F79FA8F567" xlink:to="lab_powl_LeaseLiabilitiesAbstract_0D8A3AC8CDC4CDB4B0EBE7F79FA8F567" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingLeaseLiabilityCurrent_0C767DE263613C1E0333E7F79FA8CEED_verboseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityCurrent_0C767DE263613C1E0333E7F79FA8CEED" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Current operating lease liabilities </link:label>
<link:label id="lab_us-gaap_OperatingLeaseLiabilityCurrent_0C767DE263613C1E0333E7F79FA8CEED_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityCurrent_0C767DE263613C1E0333E7F79FA8CEED" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Liability, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_0C767DE263613C1E0333E7F79FA8CEED" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseLiabilityCurrent_0C767DE263613C1E0333E7F79FA8CEED" xlink:to="lab_us-gaap_OperatingLeaseLiabilityCurrent_0C767DE263613C1E0333E7F79FA8CEED" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_97FCAB56539D7428F77DE7F79FA83298_verboseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_97FCAB56539D7428F77DE7F79FA83298" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Long-term operating lease liabilities </link:label>
<link:label id="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_97FCAB56539D7428F77DE7F79FA83298_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_97FCAB56539D7428F77DE7F79FA83298" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Liability, Noncurrent </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_97FCAB56539D7428F77DE7F79FA83298" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OperatingLeaseLiability_3B70B0A66CB2A4D78138E7F79FA87FA4_totalLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiability_3B70B0A66CB2A4D78138E7F79FA87FA4" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total lease liabilities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiability" xlink:label="loc_us-gaap_OperatingLeaseLiability_3B70B0A66CB2A4D78138E7F79FA87FA4" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseLiability_3B70B0A66CB2A4D78138E7F79FA87FA4" xlink:to="lab_us-gaap_OperatingLeaseLiability_3B70B0A66CB2A4D78138E7F79FA87FA4" xlink:type="arc"/>
<link:label id="lab_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_C45B4DF01D1488529E6AE7F7A016A5CE_label_en-US" xlink:label="lab_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_C45B4DF01D1488529E6AE7F7A016A5CE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Payment Arrangement [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_C45B4DF01D1488529E6AE7F7A016A5CE" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_17127CE87227D2679EF1E7F7A0160E19_terseLabel_en-US" xlink:label="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_17127CE87227D2679EF1E7F7A0160E19" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stock-Based Compensation </link:label>
<link:label id="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_17127CE87227D2679EF1E7F7A0160E19_label_en-US" xlink:label="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_17127CE87227D2679EF1E7F7A0160E19" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Payment Arrangement [Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_17127CE87227D2679EF1E7F7A0160E19" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LeaseCostTableTextBlock_90FB4DEA651BB4B55CA0E7F7A0952376_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseCostTableTextBlock_90FB4DEA651BB4B55CA0E7F7A0952376" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Lease Cost </link:label>
<link:label id="lab_us-gaap_LeaseCostTableTextBlock_90FB4DEA651BB4B55CA0E7F7A0952376_label_en-US" xlink:label="lab_us-gaap_LeaseCostTableTextBlock_90FB4DEA651BB4B55CA0E7F7A0952376" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lease, Cost [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseCostTableTextBlock" xlink:label="loc_us-gaap_LeaseCostTableTextBlock_90FB4DEA651BB4B55CA0E7F7A0952376" xlink:type="locator"/>
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<link:label id="lab_powl_LesseeAssetsAndLiabilitiesTableTextBlock_BDFC99C62DDD3C207765E7F7A0956DCF_terseLabel_en-US" xlink:label="lab_powl_LesseeAssetsAndLiabilitiesTableTextBlock_BDFC99C62DDD3C207765E7F7A0956DCF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating Lease Assets and Liabilities </link:label>
<link:label id="lab_powl_LesseeAssetsAndLiabilitiesTableTextBlock_BDFC99C62DDD3C207765E7F7A0956DCF_label_en-US" xlink:label="lab_powl_LesseeAssetsAndLiabilitiesTableTextBlock_BDFC99C62DDD3C207765E7F7A0956DCF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Assets And Liabilities [Table Text Block] </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_39AEA66D64853339DAA9E7F79FF6AD27_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_39AEA66D64853339DAA9E7F79FF6AD27" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_418107A8B04BC47D6AACE7F79FF6C1D0_periodStartLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_418107A8B04BC47D6AACE7F79FF6C1D0" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US"> Outstanding at beginning of period (in dollars per share) </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_E84340679C9C00B96C36E7F79FF6DAB1_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_E84340679C9C00B96C36E7F79FF6DAB1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Granted (in dollars per share) </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_F90AD6E27E29FFAD5134E7F79FF6B8F0_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_F90AD6E27E29FFAD5134E7F79FF6B8F0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Vested (in dollars per share) </link:label>
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<link:label id="lab_us-gaap_DeferredTaxAssetsValuationAllowance_2D534CFD7230B652E1E89269E0EC3D2C_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsValuationAllowance_2D534CFD7230B652E1E89269E0EC3D2C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deferred tax assets, valuation allowance </link:label>
<link:label id="lab_us-gaap_DeferredTaxAssetsValuationAllowance_2D534CFD7230B652E1E89269E0EC3D2C_label_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsValuationAllowance_2D534CFD7230B652E1E89269E0EC3D2C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Tax Assets, Valuation Allowance </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsValuationAllowance" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_2D534CFD7230B652E1E89269E0EC3D2C" xlink:type="locator"/>
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<link:label id="lab_us-gaap_FairValueDisclosuresTextBlock_D0B9AE7F5DAE5CF888C3E7F7A03CA435_label_en-US" xlink:label="lab_us-gaap_FairValueDisclosuresTextBlock_D0B9AE7F5DAE5CF888C3E7F7A03CA435" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Fair Value Disclosures [Text Block] </link:label>
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<link:label id="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_5A65D5B103947146FC06E7F79FA8C6F9_terseLabel_en-US" xlink:label="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_5A65D5B103947146FC06E7F79FA8C6F9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Basis of Presentation </link:label>
<link:label id="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_5A65D5B103947146FC06E7F79FA8C6F9_label_en-US" xlink:label="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_5A65D5B103947146FC06E7F79FA8C6F9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Basis of Accounting, Policy [Policy Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BasisOfAccountingPolicyPolicyTextBlock" xlink:label="loc_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_5A65D5B103947146FC06E7F79FA8C6F9" xlink:type="locator"/>
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<link:label id="lab_us-gaap_UseOfEstimates_AB405A11C6BE865C4616E7F79FA8FC6B_terseLabel_en-US" xlink:label="lab_us-gaap_UseOfEstimates_AB405A11C6BE865C4616E7F79FA8FC6B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Use of Estimates </link:label>
<link:label id="lab_us-gaap_UseOfEstimates_AB405A11C6BE865C4616E7F79FA8FC6B_label_en-US" xlink:label="lab_us-gaap_UseOfEstimates_AB405A11C6BE865C4616E7F79FA8FC6B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Use of Estimates, Policy [Policy Text Block] </link:label>
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<link:label id="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_B099D4D25AC307881482E7F79FA8E146_terseLabel_en-US" xlink:label="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_B099D4D25AC307881482E7F79FA8E146" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> New Accounting Standards </link:label>
<link:label id="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_B099D4D25AC307881482E7F79FA8E146_label_en-US" xlink:label="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_B099D4D25AC307881482E7F79FA8E146" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> New Accounting Pronouncements, Policy [Policy Text Block] </link:label>
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<link:label id="lab_us-gaap_RevenueFromContractWithCustomerPolicyTextBlock_D58A5A89BB30D4D180B4E7F79FA8B547_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerPolicyTextBlock_D58A5A89BB30D4D180B4E7F79FA8B547" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Revenue Recognition </link:label>
<link:label id="lab_us-gaap_RevenueFromContractWithCustomerPolicyTextBlock_D58A5A89BB30D4D180B4E7F79FA8B547_label_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerPolicyTextBlock_D58A5A89BB30D4D180B4E7F79FA8B547" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Revenue from Contract with Customer [Policy Text Block] </link:label>
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<link:label id="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_C006BCD12F67602F995CE7F7A081BC61_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_C006BCD12F67602F995CE7F7A081BC61" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fair Value of Assets and Liabilities Measured on Recurring Basis </link:label>
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<link:label id="lab_us-gaap_OperatingLeaseCost_7C52F8E5125B482E38ACE7F79FE7864F_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseCost_7C52F8E5125B482E38ACE7F79FE7864F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating lease cost </link:label>
<link:label id="lab_us-gaap_OperatingLeaseCost_7C52F8E5125B482E38ACE7F79FE7864F_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseCost_7C52F8E5125B482E38ACE7F79FE7864F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Cost </link:label>
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<link:label id="lab_us-gaap_SubleaseIncome_47058DBDD99A97A7F3AFE7F79FE771E1_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_SubleaseIncome_47058DBDD99A97A7F3AFE7F79FE771E1" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Less: sublease income </link:label>
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<link:label id="lab_us-gaap_VariableLeaseCost_E7BDE796601393007B1FE7F79FE74B52_terseLabel_en-US" xlink:label="lab_us-gaap_VariableLeaseCost_E7BDE796601393007B1FE7F79FE74B52" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Variable lease cost </link:label>
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<link:label id="lab_us-gaap_LongTermDebtTextBlock_6521282926C6493C346FE7F7A02553EB_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtTextBlock_6521282926C6493C346FE7F7A02553EB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Long-Term Debt </link:label>
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<link:label id="lab_powl_ContractWithCustomerAssetLiabilityNetCurrent_EBD362B74C349F78E38172B68C1644E1_label_en-US" xlink:label="lab_powl_ContractWithCustomerAssetLiabilityNetCurrent_EBD362B74C349F78E38172B68C1644E1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Contract With Customer, Asset (Liability), Net, Current </link:label>
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<link:label id="lab_us-gaap_ContractWithCustomerReceivableAfterAllowanceForCreditLossCurrent_1D223E772317324A09DB72B68C17C916_terseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerReceivableAfterAllowanceForCreditLossCurrent_1D223E772317324A09DB72B68C17C916" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Retained amount expected to be collected in the next twelve months </link:label>
<link:label id="lab_us-gaap_ContractWithCustomerReceivableAfterAllowanceForCreditLossCurrent_1D223E772317324A09DB72B68C17C916_label_en-US" xlink:label="lab_us-gaap_ContractWithCustomerReceivableAfterAllowanceForCreditLossCurrent_1D223E772317324A09DB72B68C17C916" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Contract with Customer, Receivable, after Allowance for Credit Loss, Current </link:label>
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<link:label id="lab_us-gaap_ContractWithCustomerReceivableAfterAllowanceForCreditLossNoncurrent_1F7EBA0958D18B09A20E72B68C17A1A3_terseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerReceivableAfterAllowanceForCreditLossNoncurrent_1F7EBA0958D18B09A20E72B68C17A1A3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Retained amount expected to be collected </link:label>
<link:label id="lab_us-gaap_ContractWithCustomerReceivableAfterAllowanceForCreditLossNoncurrent_1F7EBA0958D18B09A20E72B68C17A1A3_label_en-US" xlink:label="lab_us-gaap_ContractWithCustomerReceivableAfterAllowanceForCreditLossNoncurrent_1F7EBA0958D18B09A20E72B68C17A1A3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Contract with Customer, Receivable, after Allowance for Credit Loss, Noncurrent </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ContractWithCustomerReceivableAfterAllowanceForCreditLossNoncurrent" xlink:label="loc_us-gaap_ContractWithCustomerReceivableAfterAllowanceForCreditLossNoncurrent_1F7EBA0958D18B09A20E72B68C17A1A3" xlink:type="locator"/>
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<link:label id="lab_us-gaap_SubsequentEventTable_DBDBEA0D7A2181E151DE72B68B95E92A_terseLabel_en-US" xlink:label="lab_us-gaap_SubsequentEventTable_DBDBEA0D7A2181E151DE72B68B95E92A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Subsequent Event [Table] </link:label>
<link:label id="lab_us-gaap_SubsequentEventTable_DBDBEA0D7A2181E151DE72B68B95E92A_label_en-US" xlink:label="lab_us-gaap_SubsequentEventTable_DBDBEA0D7A2181E151DE72B68B95E92A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Subsequent Event [Table] </link:label>
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<link:label id="lab_us-gaap_SubsequentEventTypeAxis_33DF6C7C93136B9846E172B68B95976D_label_en-US" xlink:label="lab_us-gaap_SubsequentEventTypeAxis_33DF6C7C93136B9846E172B68B95976D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Subsequent Event Type [Axis] </link:label>
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<link:label id="lab_us-gaap_SubsequentEventTypeDomain_34CF1BC9E2A45CAF416F72B68B9540F1_terseLabel_en-US" xlink:label="lab_us-gaap_SubsequentEventTypeDomain_34CF1BC9E2A45CAF416F72B68B9540F1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Subsequent Event Type [Domain] </link:label>
<link:label id="lab_us-gaap_SubsequentEventTypeDomain_34CF1BC9E2A45CAF416F72B68B9540F1_label_en-US" xlink:label="lab_us-gaap_SubsequentEventTypeDomain_34CF1BC9E2A45CAF416F72B68B9540F1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Subsequent Event Type [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_34CF1BC9E2A45CAF416F72B68B9540F1" xlink:type="locator"/>
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<link:label id="lab_us-gaap_SubsequentEventMember_19793F1A3569A9D7245872B68B967429_terseLabel_en-US" xlink:label="lab_us-gaap_SubsequentEventMember_19793F1A3569A9D7245872B68B967429" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Subsequent Event </link:label>
<link:label id="lab_us-gaap_SubsequentEventMember_19793F1A3569A9D7245872B68B967429_label_en-US" xlink:label="lab_us-gaap_SubsequentEventMember_19793F1A3569A9D7245872B68B967429" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Subsequent Event [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="loc_us-gaap_SubsequentEventMember_19793F1A3569A9D7245872B68B967429" xlink:type="locator"/>
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<link:label id="lab_us-gaap_SubsequentEventLineItems_DE19725D132C32410A2172B68B966240_terseLabel_en-US" xlink:label="lab_us-gaap_SubsequentEventLineItems_DE19725D132C32410A2172B68B966240" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Subsequent Event [Line Items] </link:label>
<link:label id="lab_us-gaap_SubsequentEventLineItems_DE19725D132C32410A2172B68B966240_label_en-US" xlink:label="lab_us-gaap_SubsequentEventLineItems_DE19725D132C32410A2172B68B966240" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Subsequent Event [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventLineItems" xlink:label="loc_us-gaap_SubsequentEventLineItems_DE19725D132C32410A2172B68B966240" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CommonStockDividendsPerShareDeclared_ACB63BF4ADED3FF73E0872B68B96185D_verboseLabel_en-US" xlink:label="lab_us-gaap_CommonStockDividendsPerShareDeclared_ACB63BF4ADED3FF73E0872B68B96185D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Quarterly cash dividend (in dollars per share) </link:label>
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<link:label id="lab_us-gaap_IncomeTaxDisclosureTextBlock_A3F97045FE72B7E9C88FE7F79FB84584_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxDisclosureTextBlock_A3F97045FE72B7E9C88FE7F79FB84584" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Income Taxes </link:label>
<link:label id="lab_us-gaap_IncomeTaxDisclosureTextBlock_A3F97045FE72B7E9C88FE7F79FB84584_label_en-US" xlink:label="lab_us-gaap_IncomeTaxDisclosureTextBlock_A3F97045FE72B7E9C88FE7F79FB84584" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Income Tax Disclosure [Text Block] </link:label>
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<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_C53CB65407F12089A3F472B68BAC6521_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_C53CB65407F12089A3F472B68BAC6521" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Remainder of 2020 </link:label>
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<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_48740550915A2B18C53272B68BAD6A51_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_48740550915A2B18C53272B68BAD6A51" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2021 </link:label>
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<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_4829D9E97C7D13C24C3E72B68BAD2BD0_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_4829D9E97C7D13C24C3E72B68BAD2BD0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2022 </link:label>
<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_4829D9E97C7D13C24C3E72B68BAD2BD0_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_4829D9E97C7D13C24C3E72B68BAD2BD0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, to be Paid, Year Two </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_4829D9E97C7D13C24C3E72B68BAD2BD0" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_7DB574114F1274B693A272B68BADC953_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_7DB574114F1274B693A272B68BADC953" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2023 </link:label>
<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_7DB574114F1274B693A272B68BADC953_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_7DB574114F1274B693A272B68BADC953" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, to be Paid, Year Three </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_7DB574114F1274B693A272B68BADC953" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_42B80A107ED43CA381E872B68BAD0010_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_42B80A107ED43CA381E872B68BAD0010" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2024 </link:label>
<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_42B80A107ED43CA381E872B68BAD0010_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_42B80A107ED43CA381E872B68BAD0010" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, to be Paid, Year Four </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_42B80A107ED43CA381E872B68BAD0010" xlink:type="locator"/>
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<link:label id="lab_powl_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour_0AB53E4811C07238EDF472B68BAD5CF4_terseLabel_en-US" xlink:label="lab_powl_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour_0AB53E4811C07238EDF472B68BAD5CF4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Thereafter </link:label>
<link:label id="lab_powl_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour_0AB53E4811C07238EDF472B68BAD5CF4_label_en-US" xlink:label="lab_powl_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour_0AB53E4811C07238EDF472B68BAD5CF4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, To Be Paid, After Year Four </link:label>
<link:label id="lab_powl_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour_0AB53E4811C07238EDF472B68BAD5CF4_documentation_en-US" xlink:label="lab_powl_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour_0AB53E4811C07238EDF472B68BAD5CF4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, To Be Paid, After Year Four </link:label>
<link:loc xlink:href="powl-20200630.xsd#powl_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour" xlink:label="loc_powl_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour_0AB53E4811C07238EDF472B68BAD5CF4" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_E0F81822CD9BE5681F1A72B68BADC617_totalLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_E0F81822CD9BE5681F1A72B68BADC617" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total future minimum lease payments </link:label>
<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_E0F81822CD9BE5681F1A72B68BADC617_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_E0F81822CD9BE5681F1A72B68BADC617" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, to be Paid </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_E0F81822CD9BE5681F1A72B68BADC617" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_4C0D437D1487EF342E9372B68BAE4F1D_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_4C0D437D1487EF342E9372B68BAE4F1D" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Less: present value discount (imputed interest) </link:label>
<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_4C0D437D1487EF342E9372B68BAE4F1D_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_4C0D437D1487EF342E9372B68BAE4F1D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, Undiscounted Excess Amount </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_4C0D437D1487EF342E9372B68BAE4F1D" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OperatingLeaseLiability_889E45A6D0750ECAA83D72B68BAEDD1C_netLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiability_889E45A6D0750ECAA83D72B68BAEDD1C" xlink:role="http://www.xbrl.org/2009/role/netLabel" xlink:type="resource" xml:lang="en-US"> Present value of lease liabilities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiability" xlink:label="loc_us-gaap_OperatingLeaseLiability_889E45A6D0750ECAA83D72B68BAEDD1C" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_5424F26CD2A7AEF704C372B68BA2C17E_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_5424F26CD2A7AEF704C372B68BA2C17E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Income before income taxes </link:label>
<link:label id="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_5424F26CD2A7AEF704C372B68BA2C17E_label_en-US" xlink:label="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_5424F26CD2A7AEF704C372B68BA2C17E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_5424F26CD2A7AEF704C372B68BA2C17E" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncomeTaxExpenseBenefit_5BC15F3006F253B89D2C72B68BA20455_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxExpenseBenefit_5BC15F3006F253B89D2C72B68BA20455" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Income tax provision (benefit) </link:label>
<link:label id="lab_us-gaap_IncomeTaxExpenseBenefit_5BC15F3006F253B89D2C72B68BA20455_label_en-US" xlink:label="lab_us-gaap_IncomeTaxExpenseBenefit_5BC15F3006F253B89D2C72B68BA20455" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Income Tax Expense (Benefit) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_5BC15F3006F253B89D2C72B68BA20455" xlink:type="locator"/>
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<link:label id="lab_us-gaap_NetIncomeLoss_87605E3ABF33A21608CE72B68BA29E42_totalLabel_en-US" xlink:label="lab_us-gaap_NetIncomeLoss_87605E3ABF33A21608CE72B68BA29E42" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Net income </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_87605E3ABF33A21608CE72B68BA29E42" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_0EE3FC61B8B5A29ED9BD583E1AF46076_label_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_0EE3FC61B8B5A29ED9BD583E1AF46076" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Commitments and Contingencies Disclosure [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_0EE3FC61B8B5A29ED9BD583E1AF46076" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ScheduleOfGuaranteeObligationsTable_FBBC34D539FAB9729B21583E1AF5AB8A_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfGuaranteeObligationsTable_FBBC34D539FAB9729B21583E1AF5AB8A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule Of Guarantee Obligations [Table] </link:label>
<link:label id="lab_us-gaap_ScheduleOfGuaranteeObligationsTable_FBBC34D539FAB9729B21583E1AF5AB8A_label_en-US" xlink:label="lab_us-gaap_ScheduleOfGuaranteeObligationsTable_FBBC34D539FAB9729B21583E1AF5AB8A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Guarantor Obligations [Table] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfGuaranteeObligationsTable" xlink:label="loc_us-gaap_ScheduleOfGuaranteeObligationsTable_FBBC34D539FAB9729B21583E1AF5AB8A" xlink:type="locator"/>
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<link:label id="lab_us-gaap_SuretyBondMember_B4E041E8699C0A3DF4CF583E1AF89E06_terseLabel_en-US" xlink:label="lab_us-gaap_SuretyBondMember_B4E041E8699C0A3DF4CF583E1AF89E06" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Surety Bonds </link:label>
<link:label id="lab_us-gaap_SuretyBondMember_B4E041E8699C0A3DF4CF583E1AF89E06_label_en-US" xlink:label="lab_us-gaap_SuretyBondMember_B4E041E8699C0A3DF4CF583E1AF89E06" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Surety Bond [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SuretyBondMember" xlink:label="loc_us-gaap_SuretyBondMember_B4E041E8699C0A3DF4CF583E1AF89E06" xlink:type="locator"/>
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<link:label id="lab_powl_FacilityAgreementMember_8A8F8796B8099147CCC5583E1AF878AD_terseLabel_en-US" xlink:label="lab_powl_FacilityAgreementMember_8A8F8796B8099147CCC5583E1AF878AD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Facility Agreement </link:label>
<link:label id="lab_powl_FacilityAgreementMember_8A8F8796B8099147CCC5583E1AF878AD_label_en-US" xlink:label="lab_powl_FacilityAgreementMember_8A8F8796B8099147CCC5583E1AF878AD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Facility Agreement [Member] </link:label>
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<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_0024111E75F46C98AC40583E1AF95667" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ProductConcentrationRiskMember_727A651781FAFAC940C9E7F7A07A64FE_terseLabel_en-US" xlink:label="lab_us-gaap_ProductConcentrationRiskMember_727A651781FAFAC940C9E7F7A07A64FE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Product Concentration Risk </link:label>
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<link:label id="lab_us-gaap_RevenueFromContractWithCustomerMember_DFC3AA5BDAA0A9A5B8E8E7F7A07A56A9_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerMember_DFC3AA5BDAA0A9A5B8E8E7F7A07A56A9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Revenue from Contract with Customer Benchmark </link:label>
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<link:label id="lab_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_7B7824A9FADBB817FE16E7F7A07B475B_terseLabel_en-US" xlink:label="lab_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_7B7824A9FADBB817FE16E7F7A07B475B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Revenue from External Customer [Line Items] </link:label>
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<link:label id="lab_us-gaap_ContractWithCustomerAssetCumulativeCatchUpAdjustmentToRevenueChangeInMeasureOfProgress_6C3BE84FB1EBD1703710E7F7A07BF254_terseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerAssetCumulativeCatchUpAdjustmentToRevenueChangeInMeasureOfProgress_6C3BE84FB1EBD1703710E7F7A07BF254" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Changes in contract estimates related to projects in progress </link:label>
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<link:label id="lab_us-gaap_IncomeStatementAbstract_83B60D85C5070D2B6E8A92696F7F8655_label_en-US" xlink:label="lab_us-gaap_IncomeStatementAbstract_83B60D85C5070D2B6E8A92696F7F8655" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Income Statement [Abstract] </link:label>
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<link:label id="lab_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_9F89E5EDB51CDEC74BDA92696F7F4166_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_9F89E5EDB51CDEC74BDA92696F7F4166" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Revenues </link:label>
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<link:label id="lab_us-gaap_CostOfGoodsAndServicesSold_5B76945B5AE98CA8BBE892696F7F24F0_terseLabel_en-US" xlink:label="lab_us-gaap_CostOfGoodsAndServicesSold_5B76945B5AE98CA8BBE892696F7F24F0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cost of goods sold </link:label>
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<link:label id="lab_us-gaap_InterestExpense_591445526EF5BD13F93B92696F811AF4_label_en-US" xlink:label="lab_us-gaap_InterestExpense_591445526EF5BD13F93B92696F811AF4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Interest Expense </link:label>
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<link:label id="lab_us-gaap_InvestmentIncomeInterest_93840E1D6347C16A3B2492696F8172CD_label_en-US" xlink:label="lab_us-gaap_InvestmentIncomeInterest_93840E1D6347C16A3B2492696F8172CD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Investment Income, Interest </link:label>
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<link:label id="lab_powl_PetrochemicalMember_7C72BB0AD25CA7CC83DDE7F7A07391EE_documentation_en-US" xlink:label="lab_powl_PetrochemicalMember_7C72BB0AD25CA7CC83DDE7F7A07391EE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Petrochemical [Member] </link:label>
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<link:label id="lab_us-gaap_ElectricityMember_07E125CEBCDEA07B683BE7F7A074510B_terseLabel_en-US" xlink:label="lab_us-gaap_ElectricityMember_07E125CEBCDEA07B683BE7F7A074510B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Electric utility </link:label>
<link:label id="lab_us-gaap_ElectricityMember_07E125CEBCDEA07B683BE7F7A074510B_label_en-US" xlink:label="lab_us-gaap_ElectricityMember_07E125CEBCDEA07B683BE7F7A074510B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Electricity [Member] </link:label>
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<link:label id="lab_powl_TractionPowerCustomerMember_0EDF6E0D50BA2A0C7004E7F7A074CEA2_terseLabel_en-US" xlink:label="lab_powl_TractionPowerCustomerMember_0EDF6E0D50BA2A0C7004E7F7A074CEA2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Traction power </link:label>
<link:label id="lab_powl_TractionPowerCustomerMember_0EDF6E0D50BA2A0C7004E7F7A074CEA2_label_en-US" xlink:label="lab_powl_TractionPowerCustomerMember_0EDF6E0D50BA2A0C7004E7F7A074CEA2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Traction Power Customer [Member] </link:label>
<link:label id="lab_powl_TractionPowerCustomerMember_0EDF6E0D50BA2A0C7004E7F7A074CEA2_documentation_en-US" xlink:label="lab_powl_TractionPowerCustomerMember_0EDF6E0D50BA2A0C7004E7F7A074CEA2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Traction Power Customer [Member] </link:label>
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<link:label id="lab_powl_OtherCustomersMember_C39CB8F05D554855B322E7F7A074D7D8_terseLabel_en-US" xlink:label="lab_powl_OtherCustomersMember_C39CB8F05D554855B322E7F7A074D7D8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> All others </link:label>
<link:label id="lab_powl_OtherCustomersMember_C39CB8F05D554855B322E7F7A074D7D8_label_en-US" xlink:label="lab_powl_OtherCustomersMember_C39CB8F05D554855B322E7F7A074D7D8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other, Customers [Member] </link:label>
<link:label id="lab_powl_OtherCustomersMember_C39CB8F05D554855B322E7F7A074D7D8_documentation_en-US" xlink:label="lab_powl_OtherCustomersMember_C39CB8F05D554855B322E7F7A074D7D8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Other, Customers [Member] </link:label>
<link:loc xlink:href="powl-20200630.xsd#powl_OtherCustomersMember" xlink:label="loc_powl_OtherCustomersMember_C39CB8F05D554855B322E7F7A074D7D8" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DisaggregationOfRevenueLineItems_305E20A040BE03B3DE37E7F7A07409A7_label_en-US" xlink:label="lab_us-gaap_DisaggregationOfRevenueLineItems_305E20A040BE03B3DE37E7F7A07409A7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Disaggregation of Revenue [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_305E20A040BE03B3DE37E7F7A07409A7" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_3BA37ED2D496E98DD27FE7F7A0161E22_label_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_3BA37ED2D496E98DD27FE7F7A0161E22" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Commitments and Contingencies Disclosure [Text Block] </link:label>
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<link:label id="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_8C9E14D57CE24B5768EAE7F7A02DABC4_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_8C9E14D57CE24B5768EAE7F7A02DABC4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] </link:label>
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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_8C9E14D57CE24B5768EAE7F7A02DABC4" xlink:type="locator"/>
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<link:label id="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_265A1465E848AA06E022E7F7A02D0A93_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_265A1465E848AA06E022E7F7A02D0A93" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fair Value, Hierarchy </link:label>
<link:label id="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_265A1465E848AA06E022E7F7A02D0A93_label_en-US" xlink:label="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_265A1465E848AA06E022E7F7A02D0A93" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Fair Value Hierarchy and NAV [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_265A1465E848AA06E022E7F7A02D0A93" xlink:type="locator"/>
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<link:label id="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_E48AACCBF6A99BB54045E7F7A02EFC3E_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_E48AACCBF6A99BB54045E7F7A02EFC3E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fair Value Hierarchy </link:label>
<link:label id="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_E48AACCBF6A99BB54045E7F7A02EFC3E_label_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_E48AACCBF6A99BB54045E7F7A02EFC3E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Fair Value Hierarchy and NAV [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_E48AACCBF6A99BB54045E7F7A02EFC3E" xlink:type="locator"/>
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<link:label id="lab_us-gaap_FairValueInputsLevel1Member_97C1AAB86A58831A95C9E7F7A02EFAF0_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel1Member_97C1AAB86A58831A95C9E7F7A02EFAF0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Quoted Prices in Active Markets for Identical Assets (Level 1) </link:label>
<link:label id="lab_us-gaap_FairValueInputsLevel1Member_97C1AAB86A58831A95C9E7F7A02EFAF0_label_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel1Member_97C1AAB86A58831A95C9E7F7A02EFAF0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Fair Value, Inputs, Level 1 [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_97C1AAB86A58831A95C9E7F7A02EFAF0" xlink:type="locator"/>
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<link:label id="lab_us-gaap_FairValueInputsLevel2Member_7BB406081AF704782718E7F7A02E56A5_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel2Member_7BB406081AF704782718E7F7A02E56A5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Significant Other Observable Inputs (Level 2) </link:label>
<link:label id="lab_us-gaap_FairValueInputsLevel2Member_7BB406081AF704782718E7F7A02E56A5_label_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel2Member_7BB406081AF704782718E7F7A02E56A5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Fair Value, Inputs, Level 2 [Member] </link:label>
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<link:label id="lab_us-gaap_FairValueInputsLevel3Member_E07A8C0DC7C9519B241FE7F7A02F1930_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel3Member_E07A8C0DC7C9519B241FE7F7A02F1930" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Significant Unobservable Inputs (Level 3) </link:label>
<link:label id="lab_us-gaap_FairValueInputsLevel3Member_E07A8C0DC7C9519B241FE7F7A02F1930_label_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel3Member_E07A8C0DC7C9519B241FE7F7A02F1930" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Fair Value, Inputs, Level 3 [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_E07A8C0DC7C9519B241FE7F7A02F1930" xlink:type="locator"/>
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<link:label id="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_19D7FD226FC9DF72287BE7F7A02F39F1_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_19D7FD226FC9DF72287BE7F7A02F39F1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] </link:label>
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<link:label id="lab_us-gaap_AssetsFairValueDisclosureAbstract_1375F26FCA1A4B84630AE7F7A02FC40D_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsFairValueDisclosureAbstract_1375F26FCA1A4B84630AE7F7A02FC40D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Assets: </link:label>
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<link:label id="lab_us-gaap_CashAndCashEquivalentsFairValueDisclosure_4180C8DAAE4EA2676EE5E7F7A02F320A_terseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsFairValueDisclosure_4180C8DAAE4EA2676EE5E7F7A02F320A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cash and cash equivalents </link:label>
<link:label id="lab_us-gaap_CashAndCashEquivalentsFairValueDisclosure_4180C8DAAE4EA2676EE5E7F7A02F320A_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsFairValueDisclosure_4180C8DAAE4EA2676EE5E7F7A02F320A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cash and Cash Equivalents, Fair Value Disclosure </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_4180C8DAAE4EA2676EE5E7F7A02F320A" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_4180C8DAAE4EA2676EE5E7F7A02F320A" xlink:to="lab_us-gaap_CashAndCashEquivalentsFairValueDisclosure_4180C8DAAE4EA2676EE5E7F7A02F320A" xlink:type="arc"/>
<link:label id="lab_powl_ShorttermInvestmentsFairValueDisclosure_11C5B38F99421A4849A8E7F7A030EFFB_terseLabel_en-US" xlink:label="lab_powl_ShorttermInvestmentsFairValueDisclosure_11C5B38F99421A4849A8E7F7A030EFFB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Short-term investments </link:label>
<link:label id="lab_powl_ShorttermInvestmentsFairValueDisclosure_11C5B38F99421A4849A8E7F7A030EFFB_label_en-US" xlink:label="lab_powl_ShorttermInvestmentsFairValueDisclosure_11C5B38F99421A4849A8E7F7A030EFFB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Short-term Investments, Fair Value Disclosure </link:label>
<link:label id="lab_powl_ShorttermInvestmentsFairValueDisclosure_11C5B38F99421A4849A8E7F7A030EFFB_documentation_en-US" xlink:label="lab_powl_ShorttermInvestmentsFairValueDisclosure_11C5B38F99421A4849A8E7F7A030EFFB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Short-term Investments, Fair Value Disclosure </link:label>
<link:loc xlink:href="powl-20200630.xsd#powl_ShorttermInvestmentsFairValueDisclosure" xlink:label="loc_powl_ShorttermInvestmentsFairValueDisclosure_11C5B38F99421A4849A8E7F7A030EFFB" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_powl_ShorttermInvestmentsFairValueDisclosure_11C5B38F99421A4849A8E7F7A030EFFB" xlink:to="lab_powl_ShorttermInvestmentsFairValueDisclosure_11C5B38F99421A4849A8E7F7A030EFFB" xlink:type="arc"/>
<link:label id="lab_us-gaap_OtherAssetsFairValueDisclosure_DB40E775CFD1ECDA9178E7F7A0308179_verboseLabel_en-US" xlink:label="lab_us-gaap_OtherAssetsFairValueDisclosure_DB40E775CFD1ECDA9178E7F7A0308179" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Other assets </link:label>
<link:label id="lab_us-gaap_OtherAssetsFairValueDisclosure_DB40E775CFD1ECDA9178E7F7A0308179_label_en-US" xlink:label="lab_us-gaap_OtherAssetsFairValueDisclosure_DB40E775CFD1ECDA9178E7F7A0308179" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Assets, Fair Value Disclosure </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAssetsFairValueDisclosure" xlink:label="loc_us-gaap_OtherAssetsFairValueDisclosure_DB40E775CFD1ECDA9178E7F7A0308179" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherAssetsFairValueDisclosure_DB40E775CFD1ECDA9178E7F7A0308179" xlink:to="lab_us-gaap_OtherAssetsFairValueDisclosure_DB40E775CFD1ECDA9178E7F7A0308179" xlink:type="arc"/>
<link:label id="lab_us-gaap_LiabilitiesFairValueDisclosureAbstract_7DF9C9AA13C3E76268BCE7F7A0304B42_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesFairValueDisclosureAbstract_7DF9C9AA13C3E76268BCE7F7A0304B42" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Liabilities: </link:label>
<link:label id="lab_us-gaap_LiabilitiesFairValueDisclosureAbstract_7DF9C9AA13C3E76268BCE7F7A0304B42_label_en-US" xlink:label="lab_us-gaap_LiabilitiesFairValueDisclosureAbstract_7DF9C9AA13C3E76268BCE7F7A0304B42" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities, Fair Value Disclosure [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosureAbstract" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_7DF9C9AA13C3E76268BCE7F7A0304B42" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_7DF9C9AA13C3E76268BCE7F7A0304B42" xlink:to="lab_us-gaap_LiabilitiesFairValueDisclosureAbstract_7DF9C9AA13C3E76268BCE7F7A0304B42" xlink:type="arc"/>
<link:label id="lab_us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent_6A7FF7688ADFA7B2319EE7F7A030E6C6_verboseLabel_en-US" xlink:label="lab_us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent_6A7FF7688ADFA7B2319EE7F7A030E6C6" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Deferred compensation </link:label>
<link:label id="lab_us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent_6A7FF7688ADFA7B2319EE7F7A030E6C6_label_en-US" xlink:label="lab_us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent_6A7FF7688ADFA7B2319EE7F7A030E6C6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Compensation Liability, Current and Noncurrent </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent" xlink:label="loc_us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent_6A7FF7688ADFA7B2319EE7F7A030E6C6" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent_6A7FF7688ADFA7B2319EE7F7A030E6C6" xlink:to="lab_us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent_6A7FF7688ADFA7B2319EE7F7A030E6C6" xlink:type="arc"/>
<link:label id="lab_us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock_FBB50A80D7537FC228FDE7F7A03648E9_terseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock_FBB50A80D7537FC228FDE7F7A03648E9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Summary of Contract Asset and Liabilities </link:label>
<link:label id="lab_us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock_FBB50A80D7537FC228FDE7F7A03648E9_label_en-US" xlink:label="lab_us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock_FBB50A80D7537FC228FDE7F7A03648E9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock" xlink:label="loc_us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock_FBB50A80D7537FC228FDE7F7A03648E9" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock_FBB50A80D7537FC228FDE7F7A03648E9" xlink:to="lab_us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock_FBB50A80D7537FC228FDE7F7A03648E9" xlink:type="arc"/>
<link:label id="lab_us-gaap_DisaggregationOfRevenueTableTextBlock_56CB34813A5C6E5A6B48E7F7A037D543_terseLabel_en-US" xlink:label="lab_us-gaap_DisaggregationOfRevenueTableTextBlock_56CB34813A5C6E5A6B48E7F7A037D543" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Disaggregation of Revenue </link:label>
<link:label id="lab_us-gaap_DisaggregationOfRevenueTableTextBlock_56CB34813A5C6E5A6B48E7F7A037D543_label_en-US" xlink:label="lab_us-gaap_DisaggregationOfRevenueTableTextBlock_56CB34813A5C6E5A6B48E7F7A037D543" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Disaggregation of Revenue [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisaggregationOfRevenueTableTextBlock" xlink:label="loc_us-gaap_DisaggregationOfRevenueTableTextBlock_56CB34813A5C6E5A6B48E7F7A037D543" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DisaggregationOfRevenueTableTextBlock_56CB34813A5C6E5A6B48E7F7A037D543" xlink:to="lab_us-gaap_DisaggregationOfRevenueTableTextBlock_56CB34813A5C6E5A6B48E7F7A037D543" xlink:type="arc"/>
<link:label id="lab_us-gaap_RevenueFromContractWithCustomerTextBlock_256210B451E4E0D331C6E7F7A016B546_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerTextBlock_256210B451E4E0D331C6E7F7A016B546" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Revenue </link:label>
<link:label id="lab_us-gaap_RevenueFromContractWithCustomerTextBlock_256210B451E4E0D331C6E7F7A016B546_label_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerTextBlock_256210B451E4E0D331C6E7F7A016B546" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Revenue from Contract with Customer [Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueFromContractWithCustomerTextBlock" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerTextBlock_256210B451E4E0D331C6E7F7A016B546" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerTextBlock_256210B451E4E0D331C6E7F7A016B546" xlink:to="lab_us-gaap_RevenueFromContractWithCustomerTextBlock_256210B451E4E0D331C6E7F7A016B546" xlink:type="arc"/>
<link:label id="lab_us-gaap_StatementOfCashFlowsAbstract_DCF4EF3988465690A93D72B68C663D63_label_en-US" xlink:label="lab_us-gaap_StatementOfCashFlowsAbstract_DCF4EF3988465690A93D72B68C663D63" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Statement of Cash Flows [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementOfCashFlowsAbstract" xlink:label="loc_us-gaap_StatementOfCashFlowsAbstract_DCF4EF3988465690A93D72B68C663D63" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_DCF4EF3988465690A93D72B68C663D63" xlink:to="lab_us-gaap_StatementOfCashFlowsAbstract_DCF4EF3988465690A93D72B68C663D63" xlink:type="arc"/>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_4A2D03A02784E4A2053A72B68C66235F_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_4A2D03A02784E4A2053A72B68C66235F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating Activities: </link:label>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_4A2D03A02784E4A2053A72B68C66235F_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_4A2D03A02784E4A2053A72B68C66235F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_4A2D03A02784E4A2053A72B68C66235F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_4A2D03A02784E4A2053A72B68C66235F" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_4A2D03A02784E4A2053A72B68C66235F" xlink:type="arc"/>
<link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_420D711B197BD10B5B4472B68C679F11_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_420D711B197BD10B5B4472B68C679F11" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Adjustments to reconcile net income to net cash provided by operating activities: </link:label>
<link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_420D711B197BD10B5B4472B68C679F11_label_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_420D711B197BD10B5B4472B68C679F11" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_420D711B197BD10B5B4472B68C679F11" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DepreciationDepletionAndAmortization_9C3CC5AA195053FAB5BE72B68C67E886_terseLabel_en-US" xlink:label="lab_us-gaap_DepreciationDepletionAndAmortization_9C3CC5AA195053FAB5BE72B68C67E886" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Depreciation and amortization </link:label>
<link:label id="lab_us-gaap_DepreciationDepletionAndAmortization_9C3CC5AA195053FAB5BE72B68C67E886_label_en-US" xlink:label="lab_us-gaap_DepreciationDepletionAndAmortization_9C3CC5AA195053FAB5BE72B68C67E886" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Depreciation, Depletion and Amortization </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_9C3CC5AA195053FAB5BE72B68C67E886" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ShareBasedCompensation_FD1214792186B116AD3772B68C6749F9_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_FD1214792186B116AD3772B68C6749F9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stock-based compensation </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensation_FD1214792186B116AD3772B68C6749F9_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_FD1214792186B116AD3772B68C6749F9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Payment Arrangement, Noncash Expense </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_FD1214792186B116AD3772B68C6749F9" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ProvisionForDoubtfulAccounts_A7E8DBF39AFD1631A54D72B68C677CA6_terseLabel_en-US" xlink:label="lab_us-gaap_ProvisionForDoubtfulAccounts_A7E8DBF39AFD1631A54D72B68C677CA6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Bad debt expense </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProvisionForDoubtfulAccounts" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_A7E8DBF39AFD1631A54D72B68C677CA6" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_776E108A3698F821AB5F72B68C68AEE4_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_776E108A3698F821AB5F72B68C68AEE4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deferred income taxes </link:label>
<link:label id="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_776E108A3698F821AB5F72B68C68AEE4_label_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_776E108A3698F821AB5F72B68C68AEE4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Income Tax Expense (Benefit) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_776E108A3698F821AB5F72B68C68AEE4" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_44B0362FBFA7A5338C3972B68C685A35_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_44B0362FBFA7A5338C3972B68C685A35" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Changes in operating assets and liabilities: </link:label>
<link:label id="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_44B0362FBFA7A5338C3972B68C685A35_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_44B0362FBFA7A5338C3972B68C685A35" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Operating Capital [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_44B0362FBFA7A5338C3972B68C685A35" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_44B0362FBFA7A5338C3972B68C685A35" xlink:to="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_44B0362FBFA7A5338C3972B68C685A35" xlink:type="arc"/>
<link:label id="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_A40F66BC4E8807EEE79172B68C68BD89_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_A40F66BC4E8807EEE79172B68C68BD89" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Accounts receivable, net </link:label>
<link:label id="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_A40F66BC4E8807EEE79172B68C68BD89_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_A40F66BC4E8807EEE79172B68C68BD89" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Accounts Receivable </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_A40F66BC4E8807EEE79172B68C68BD89" xlink:type="locator"/>
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<link:label id="lab_powl_IncreaseDecreaseInContractWithCustomerAssetAndLiabilityNet_A621ABE1B556BF1A530772B68C686053_negatedLabel_en-US" xlink:label="lab_powl_IncreaseDecreaseInContractWithCustomerAssetAndLiabilityNet_A621ABE1B556BF1A530772B68C686053" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Contract assets and liabilities, net </link:label>
<link:label id="lab_powl_IncreaseDecreaseInContractWithCustomerAssetAndLiabilityNet_A621ABE1B556BF1A530772B68C686053_label_en-US" xlink:label="lab_powl_IncreaseDecreaseInContractWithCustomerAssetAndLiabilityNet_A621ABE1B556BF1A530772B68C686053" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) In Contract With Customer Asset And Liability, Net </link:label>
<link:label id="lab_powl_IncreaseDecreaseInContractWithCustomerAssetAndLiabilityNet_A621ABE1B556BF1A530772B68C686053_documentation_en-US" xlink:label="lab_powl_IncreaseDecreaseInContractWithCustomerAssetAndLiabilityNet_A621ABE1B556BF1A530772B68C686053" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) In Contract With Customer Asset And Liability, Net </link:label>
<link:loc xlink:href="powl-20200630.xsd#powl_IncreaseDecreaseInContractWithCustomerAssetAndLiabilityNet" xlink:label="loc_powl_IncreaseDecreaseInContractWithCustomerAssetAndLiabilityNet_A621ABE1B556BF1A530772B68C686053" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncreaseDecreaseInInventories_308F0A0461AB917B35AB72B68C694F2C_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInInventories_308F0A0461AB917B35AB72B68C694F2C" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Inventories </link:label>
<link:label id="lab_us-gaap_IncreaseDecreaseInInventories_308F0A0461AB917B35AB72B68C694F2C_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInInventories_308F0A0461AB917B35AB72B68C694F2C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Inventories </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInInventories" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_308F0A0461AB917B35AB72B68C694F2C" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_ECA4151EA7D859E07D9B72B68C69E439_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_ECA4151EA7D859E07D9B72B68C69E439" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Income taxes </link:label>
<link:label id="lab_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_ECA4151EA7D859E07D9B72B68C69E439_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_ECA4151EA7D859E07D9B72B68C69E439" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Income Taxes Payable </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_ECA4151EA7D859E07D9B72B68C69E439" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_ECA4151EA7D859E07D9B72B68C69E439" xlink:to="lab_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_ECA4151EA7D859E07D9B72B68C69E439" xlink:type="arc"/>
<link:label id="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_D671A429BF0E21A0BAD072B68C69D978_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_D671A429BF0E21A0BAD072B68C69D978" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Prepaid expenses and other current assets </link:label>
<link:label id="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_D671A429BF0E21A0BAD072B68C69D978_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_D671A429BF0E21A0BAD072B68C69D978" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Prepaid Expense and Other Assets </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_D671A429BF0E21A0BAD072B68C69D978" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_D671A429BF0E21A0BAD072B68C69D978" xlink:to="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_D671A429BF0E21A0BAD072B68C69D978" xlink:type="arc"/>
<link:label id="lab_us-gaap_IncreaseDecreaseInAccountsPayable_9CE76A847CDB180F61FC72B68C69833E_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsPayable_9CE76A847CDB180F61FC72B68C69833E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accounts payable </link:label>
<link:label id="lab_us-gaap_IncreaseDecreaseInAccountsPayable_9CE76A847CDB180F61FC72B68C69833E_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsPayable_9CE76A847CDB180F61FC72B68C69833E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Accounts Payable </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_9CE76A847CDB180F61FC72B68C69833E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInAccountsPayable_9CE76A847CDB180F61FC72B68C69833E" xlink:to="lab_us-gaap_IncreaseDecreaseInAccountsPayable_9CE76A847CDB180F61FC72B68C69833E" xlink:type="arc"/>
<link:label id="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_1BB4DAC51B6CB3E8CBEF72B68C6955D2_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_1BB4DAC51B6CB3E8CBEF72B68C6955D2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accrued liabilities </link:label>
<link:label id="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_1BB4DAC51B6CB3E8CBEF72B68C6955D2_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_1BB4DAC51B6CB3E8CBEF72B68C6955D2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Accrued Liabilities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_1BB4DAC51B6CB3E8CBEF72B68C6955D2" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_1BB4DAC51B6CB3E8CBEF72B68C6955D2" xlink:to="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_1BB4DAC51B6CB3E8CBEF72B68C6955D2" xlink:type="arc"/>
<link:label id="lab_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_B2CE05BCF23F956DD7B772B68C6A4D97_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_B2CE05BCF23F956DD7B772B68C6A4D97" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Other, net </link:label>
<link:label id="lab_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_B2CE05BCF23F956DD7B772B68C6A4D97_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_B2CE05BCF23F956DD7B772B68C6A4D97" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Other Operating Assets and Liabilities, Net </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_B2CE05BCF23F956DD7B772B68C6A4D97" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_B2CE05BCF23F956DD7B772B68C6A4D97" xlink:to="lab_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_B2CE05BCF23F956DD7B772B68C6A4D97" xlink:type="arc"/>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_C109C47D2CB9B4C6063672B68C6A341F_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_C109C47D2CB9B4C6063672B68C6A341F" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Net cash provided by operating activities </link:label>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_C109C47D2CB9B4C6063672B68C6A341F_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_C109C47D2CB9B4C6063672B68C6A341F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Operating Activities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_C109C47D2CB9B4C6063672B68C6A341F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_C109C47D2CB9B4C6063672B68C6A341F" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_C109C47D2CB9B4C6063672B68C6A341F" xlink:type="arc"/>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_7F5E79D1B98DEEE4535972B68C6A4A39_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_7F5E79D1B98DEEE4535972B68C6A4A39" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Investing Activities: </link:label>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_7F5E79D1B98DEEE4535972B68C6A4A39_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_7F5E79D1B98DEEE4535972B68C6A4A39" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_7F5E79D1B98DEEE4535972B68C6A4A39" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_7F5E79D1B98DEEE4535972B68C6A4A39" xlink:to="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_7F5E79D1B98DEEE4535972B68C6A4A39" xlink:type="arc"/>
<link:label id="lab_us-gaap_PaymentsToAcquireShortTermInvestments_958F270F2C52EEEE7E0F72B68C6A7E3E_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireShortTermInvestments_958F270F2C52EEEE7E0F72B68C6A7E3E" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Purchases of short-term investments </link:label>
<link:label id="lab_us-gaap_PaymentsToAcquireShortTermInvestments_958F270F2C52EEEE7E0F72B68C6A7E3E_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireShortTermInvestments_958F270F2C52EEEE7E0F72B68C6A7E3E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payments to Acquire Short-term Investments </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireShortTermInvestments" xlink:label="loc_us-gaap_PaymentsToAcquireShortTermInvestments_958F270F2C52EEEE7E0F72B68C6A7E3E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToAcquireShortTermInvestments_958F270F2C52EEEE7E0F72B68C6A7E3E" xlink:to="lab_us-gaap_PaymentsToAcquireShortTermInvestments_958F270F2C52EEEE7E0F72B68C6A7E3E" xlink:type="arc"/>
<link:label id="lab_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments_BE50329196F73F11EF3172B68C6A3C4E_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments_BE50329196F73F11EF3172B68C6A3C4E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Maturities of short-term investments </link:label>
<link:label id="lab_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments_BE50329196F73F11EF3172B68C6A3C4E_label_en-US" xlink:label="lab_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments_BE50329196F73F11EF3172B68C6A3C4E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Proceeds from Maturities, Prepayments and Calls of Short-term Investments </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments" xlink:label="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments_BE50329196F73F11EF3172B68C6A3C4E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments_BE50329196F73F11EF3172B68C6A3C4E" xlink:to="lab_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments_BE50329196F73F11EF3172B68C6A3C4E" xlink:type="arc"/>
<link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_A82A091C05FE34B7FCB772B68C6AE5B6_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_A82A091C05FE34B7FCB772B68C6AE5B6" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Purchases of property, plant and equipment, net </link:label>
<link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_A82A091C05FE34B7FCB772B68C6AE5B6_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_A82A091C05FE34B7FCB772B68C6AE5B6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payments to Acquire Property, Plant, and Equipment </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_A82A091C05FE34B7FCB772B68C6AE5B6" xlink:type="locator"/>
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<link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_6ECF127E680AFD29803572B68C6B37A7_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_6ECF127E680AFD29803572B68C6B37A7" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Net cash provided by (used in) investing activities </link:label>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_6ECF127E680AFD29803572B68C6B37A7_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_6ECF127E680AFD29803572B68C6B37A7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Investing Activities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_6ECF127E680AFD29803572B68C6B37A7" xlink:type="locator"/>
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<link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_14C6080DE11F6884A67B72B68C6B1D33_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_14C6080DE11F6884A67B72B68C6B1D33" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Financing Activities: </link:label>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_14C6080DE11F6884A67B72B68C6B1D33_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_14C6080DE11F6884A67B72B68C6B1D33" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_14C6080DE11F6884A67B72B68C6B1D33" xlink:type="locator"/>
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<link:label id="lab_us-gaap_RepaymentsOfLongTermDebt_EDBC098446E39F02B20F72B68C6B44BF_negatedLabel_en-US" xlink:label="lab_us-gaap_RepaymentsOfLongTermDebt_EDBC098446E39F02B20F72B68C6B44BF" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Payments on industrial development revenue bonds </link:label>
<link:label id="lab_us-gaap_RepaymentsOfLongTermDebt_EDBC098446E39F02B20F72B68C6B44BF_label_en-US" xlink:label="lab_us-gaap_RepaymentsOfLongTermDebt_EDBC098446E39F02B20F72B68C6B44BF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Repayments of Long-term Debt </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RepaymentsOfLongTermDebt" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_EDBC098446E39F02B20F72B68C6B44BF" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_BB566A29A2593FDF081772B68C6BDC30_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_BB566A29A2593FDF081772B68C6BDC30" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Shares withheld in lieu of employee tax withholding </link:label>
<link:label id="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_BB566A29A2593FDF081772B68C6BDC30_label_en-US" xlink:label="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_BB566A29A2593FDF081772B68C6BDC30" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payment, Tax Withholding, Share-based Payment Arrangement </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_BB566A29A2593FDF081772B68C6BDC30" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PaymentsOfDividendsCommonStock_87BF03F7A375AC389F8372B68C6CFB45_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsOfDividendsCommonStock_87BF03F7A375AC389F8372B68C6CFB45" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Dividends paid </link:label>
<link:label id="lab_us-gaap_PaymentsOfDividendsCommonStock_87BF03F7A375AC389F8372B68C6CFB45_label_en-US" xlink:label="lab_us-gaap_PaymentsOfDividendsCommonStock_87BF03F7A375AC389F8372B68C6CFB45" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payments of Ordinary Dividends, Common Stock </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsOfDividendsCommonStock" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_87BF03F7A375AC389F8372B68C6CFB45" xlink:type="locator"/>
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<link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_E21A66C886CC2679A16072B68C6C81C9_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_E21A66C886CC2679A16072B68C6C81C9" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Net cash used in financing activities </link:label>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_E21A66C886CC2679A16072B68C6C81C9_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_E21A66C886CC2679A16072B68C6C81C9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Financing Activities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_E21A66C886CC2679A16072B68C6C81C9" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_6036FDC6841C1EDD47FF72B68C6CBD12_totalLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_6036FDC6841C1EDD47FF72B68C6CBD12" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Net increase in cash, cash equivalents and restricted cash </link:label>
<link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_6036FDC6841C1EDD47FF72B68C6CBD12_label_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_6036FDC6841C1EDD47FF72B68C6CBD12" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_6036FDC6841C1EDD47FF72B68C6CBD12" xlink:type="locator"/>
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<link:label id="lab_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_FB4B5B2263CF6363F91572B68C6CEE7A_terseLabel_en-US" xlink:label="lab_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_FB4B5B2263CF6363F91572B68C6CEE7A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Effect of exchange rate changes on cash, cash equivalents and restricted cash </link:label>
<link:label id="lab_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_FB4B5B2263CF6363F91572B68C6CEE7A_label_en-US" xlink:label="lab_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_FB4B5B2263CF6363F91572B68C6CEE7A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_FB4B5B2263CF6363F91572B68C6CEE7A" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_8C2FA9E8B1CA1EE97DEC72B68C6C6E1D_periodStartLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_8C2FA9E8B1CA1EE97DEC72B68C6C6E1D" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US"> Cash, cash equivalents and restricted cash at beginning of period </link:label>
<link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_8C2FA9E8B1CA1EE97DEC72B68C6C6E1D_label_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_8C2FA9E8B1CA1EE97DEC72B68C6C6E1D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_8C2FA9E8B1CA1EE97DEC72B68C6C6E1D" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_AEA0DBBBBC428609267372B68C6D4373_periodEndLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_AEA0DBBBBC428609267372B68C6D4373" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US"> Cash, cash equivalents and restricted cash at end of period </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_AEA0DBBBBC428609267372B68C6D4373" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_255C46548D1EF2088388E7F7A040CA9B_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_255C46548D1EF2088388E7F7A040CA9B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Reconciliation of Basic and Diluted Weighted Average Shares used in Computation of Earnings Per Share </link:label>
<link:label id="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_255C46548D1EF2088388E7F7A040CA9B_label_en-US" xlink:label="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_255C46548D1EF2088388E7F7A040CA9B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] </link:label>
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<link:label id="lab_us-gaap_AssetsAbstract_1849A9FE2B19E107143572B68CB9697A_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsAbstract_1849A9FE2B19E107143572B68CB9697A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> ASSETS </link:label>
<link:label id="lab_us-gaap_AssetsAbstract_1849A9FE2B19E107143572B68CB9697A_label_en-US" xlink:label="lab_us-gaap_AssetsAbstract_1849A9FE2B19E107143572B68CB9697A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Assets [Abstract] </link:label>
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<link:label id="lab_us-gaap_AssetsCurrentAbstract_00026DD4335106F827FD72B68CBA1C8A_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsCurrentAbstract_00026DD4335106F827FD72B68CBA1C8A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Current Assets: </link:label>
<link:label id="lab_us-gaap_AssetsCurrentAbstract_00026DD4335106F827FD72B68CBA1C8A_label_en-US" xlink:label="lab_us-gaap_AssetsCurrentAbstract_00026DD4335106F827FD72B68CBA1C8A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Assets, Current [Abstract] </link:label>
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<link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_7AFBF4CEB2F6A88C817572B68CBB454F_terseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_7AFBF4CEB2F6A88C817572B68CBB454F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cash and cash equivalents </link:label>
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<link:label id="lab_us-gaap_ShortTermInvestments_11C95AE73B04C8DBDC8372B68CBB09D6_terseLabel_en-US" xlink:label="lab_us-gaap_ShortTermInvestments_11C95AE73B04C8DBDC8372B68CBB09D6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Short-term investments </link:label>
<link:label id="lab_us-gaap_ShortTermInvestments_11C95AE73B04C8DBDC8372B68CBB09D6_label_en-US" xlink:label="lab_us-gaap_ShortTermInvestments_11C95AE73B04C8DBDC8372B68CBB09D6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Short-term Investments </link:label>
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<link:label id="lab_us-gaap_AccountsReceivableNetCurrent_B6DD3D8AA7B3B825ECBD72B68CBBE909_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetCurrent_B6DD3D8AA7B3B825ECBD72B68CBBE909" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accounts receivable, less allowance for doubtful accounts of $434 and $301 </link:label>
<link:label id="lab_us-gaap_AccountsReceivableNetCurrent_B6DD3D8AA7B3B825ECBD72B68CBBE909_label_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetCurrent_B6DD3D8AA7B3B825ECBD72B68CBBE909" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accounts Receivable, after Allowance for Credit Loss, Current </link:label>
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<link:label id="lab_us-gaap_ContractWithCustomerAssetNetCurrent_63E85B03B63F3EFBF02A72B68CBBB06D_terseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerAssetNetCurrent_63E85B03B63F3EFBF02A72B68CBBB06D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Contract assets </link:label>
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<link:label id="lab_us-gaap_InventoryNet_3D95FDC86E457EC0884972B68CBB1187_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryNet_3D95FDC86E457EC0884972B68CBB1187" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Inventories </link:label>
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<link:label id="lab_us-gaap_IncomeTaxesReceivable_894E1AA8EBAF157BD3A072B68CBB9E7A_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxesReceivable_894E1AA8EBAF157BD3A072B68CBB9E7A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Income taxes receivable </link:label>
<link:label id="lab_us-gaap_IncomeTaxesReceivable_894E1AA8EBAF157BD3A072B68CBB9E7A_label_en-US" xlink:label="lab_us-gaap_IncomeTaxesReceivable_894E1AA8EBAF157BD3A072B68CBB9E7A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Income Taxes Receivable, Current </link:label>
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<link:label id="lab_us-gaap_PrepaidExpenseCurrent_D20D38F0855963F5F24C72B68CBC8246_terseLabel_en-US" xlink:label="lab_us-gaap_PrepaidExpenseCurrent_D20D38F0855963F5F24C72B68CBC8246" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Prepaid expenses </link:label>
<link:label id="lab_us-gaap_PrepaidExpenseCurrent_D20D38F0855963F5F24C72B68CBC8246_label_en-US" xlink:label="lab_us-gaap_PrepaidExpenseCurrent_D20D38F0855963F5F24C72B68CBC8246" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Prepaid Expense, Current </link:label>
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<link:label id="lab_us-gaap_OtherAssetsCurrent_FA704ABC6498CB0EC2B672B68CBC2C4D_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAssetsCurrent_FA704ABC6498CB0EC2B672B68CBC2C4D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other current assets </link:label>
<link:label id="lab_us-gaap_OtherAssetsCurrent_FA704ABC6498CB0EC2B672B68CBC2C4D_label_en-US" xlink:label="lab_us-gaap_OtherAssetsCurrent_FA704ABC6498CB0EC2B672B68CBC2C4D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Assets, Current </link:label>
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<link:label id="lab_us-gaap_AssetsCurrent_F431443F3FB029CA27B372B68CBC0D6F_totalLabel_en-US" xlink:label="lab_us-gaap_AssetsCurrent_F431443F3FB029CA27B372B68CBC0D6F" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total Current Assets </link:label>
<link:label id="lab_us-gaap_AssetsCurrent_F431443F3FB029CA27B372B68CBC0D6F_label_en-US" xlink:label="lab_us-gaap_AssetsCurrent_F431443F3FB029CA27B372B68CBC0D6F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Assets, Current </link:label>
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<link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_C2E45D55A45C82C80CE972B68CBCD557_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_C2E45D55A45C82C80CE972B68CBCD557" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property, plant and equipment, net </link:label>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_C2E45D55A45C82C80CE972B68CBCD557_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_C2E45D55A45C82C80CE972B68CBCD557" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Net </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_C2E45D55A45C82C80CE972B68CBCD557" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IntangibleAssetsNetIncludingGoodwill_8DB46AE6F6CC0801A83172B68CBD9912_terseLabel_en-US" xlink:label="lab_us-gaap_IntangibleAssetsNetIncludingGoodwill_8DB46AE6F6CC0801A83172B68CBD9912" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Goodwill and intangible assets, net </link:label>
<link:label id="lab_us-gaap_IntangibleAssetsNetIncludingGoodwill_8DB46AE6F6CC0801A83172B68CBD9912_label_en-US" xlink:label="lab_us-gaap_IntangibleAssetsNetIncludingGoodwill_8DB46AE6F6CC0801A83172B68CBD9912" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Intangible Assets, Net (Including Goodwill) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IntangibleAssetsNetIncludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetIncludingGoodwill_8DB46AE6F6CC0801A83172B68CBD9912" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DeferredIncomeTaxAssetsNet_CCD3860CC74D5EC4FF4972B68CBD0E1B_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxAssetsNet_CCD3860CC74D5EC4FF4972B68CBD0E1B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deferred income taxes </link:label>
<link:label id="lab_us-gaap_DeferredIncomeTaxAssetsNet_CCD3860CC74D5EC4FF4972B68CBD0E1B_label_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxAssetsNet_CCD3860CC74D5EC4FF4972B68CBD0E1B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Income Tax Assets, Net </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxAssetsNet" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_CCD3860CC74D5EC4FF4972B68CBD0E1B" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OtherAssetsNoncurrent_F15CDAD9A0EE6BA6893D72B68CBD8E22_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAssetsNoncurrent_F15CDAD9A0EE6BA6893D72B68CBD8E22" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other assets </link:label>
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<link:label id="lab_us-gaap_AccountsPayableCurrent_0FA2420ADE2134FF3AFA72B68CBE642D_label_en-US" xlink:label="lab_us-gaap_AccountsPayableCurrent_0FA2420ADE2134FF3AFA72B68CBE642D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accounts Payable, Current </link:label>
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<link:label id="lab_us-gaap_ContractWithCustomerLiabilityCurrent_1E9867317294E2B94DE772B68CC05980_terseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerLiabilityCurrent_1E9867317294E2B94DE772B68CC05980" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Contract liabilities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ContractWithCustomerLiabilityCurrent" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_1E9867317294E2B94DE772B68CC05980" xlink:type="locator"/>
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<link:label id="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_B2C195945EA7EE5CB7BD72B68CC0E979_terseLabel_en-US" xlink:label="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_B2C195945EA7EE5CB7BD72B68CC0E979" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accrued compensation and benefits </link:label>
<link:label id="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_B2C195945EA7EE5CB7BD72B68CC0E979_label_en-US" xlink:label="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_B2C195945EA7EE5CB7BD72B68CC0E979" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Employee-related Liabilities, Current </link:label>
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<link:label id="lab_us-gaap_ProductWarrantyAccrualClassifiedCurrent_172C7F7A649CA8D0A79A72B68CC1B27E_terseLabel_en-US" xlink:label="lab_us-gaap_ProductWarrantyAccrualClassifiedCurrent_172C7F7A649CA8D0A79A72B68CC1B27E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accrued product warranty </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProductWarrantyAccrualClassifiedCurrent" xlink:label="loc_us-gaap_ProductWarrantyAccrualClassifiedCurrent_172C7F7A649CA8D0A79A72B68CC1B27E" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OperatingLeaseLiabilityCurrent_B5154CFBE4EAE7103CED72B68CC19ACC_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityCurrent_B5154CFBE4EAE7103CED72B68CC19ACC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Current operating lease liabilities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_B5154CFBE4EAE7103CED72B68CC19ACC" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AccruedIncomeTaxesCurrent_2D69E665B8F83542999372B68CC16803_terseLabel_en-US" xlink:label="lab_us-gaap_AccruedIncomeTaxesCurrent_2D69E665B8F83542999372B68CC16803" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Income taxes payable </link:label>
<link:label id="lab_us-gaap_AccruedIncomeTaxesCurrent_2D69E665B8F83542999372B68CC16803_label_en-US" xlink:label="lab_us-gaap_AccruedIncomeTaxesCurrent_2D69E665B8F83542999372B68CC16803" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accrued Income Taxes, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccruedIncomeTaxesCurrent" xlink:label="loc_us-gaap_AccruedIncomeTaxesCurrent_2D69E665B8F83542999372B68CC16803" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OtherAccruedLiabilitiesCurrent_54B465E79A19A478F15872B68CC1D0A0_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAccruedLiabilitiesCurrent_54B465E79A19A478F15872B68CC1D0A0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other current liabilities </link:label>
<link:label id="lab_us-gaap_OtherAccruedLiabilitiesCurrent_54B465E79A19A478F15872B68CC1D0A0_label_en-US" xlink:label="lab_us-gaap_OtherAccruedLiabilitiesCurrent_54B465E79A19A478F15872B68CC1D0A0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Accrued Liabilities, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesCurrent_54B465E79A19A478F15872B68CC1D0A0" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LiabilitiesCurrent_C3BB92EF491809D8AED172B68CC1446C_totalLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrent_C3BB92EF491809D8AED172B68CC1446C" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total Current Liabilities </link:label>
<link:label id="lab_us-gaap_LiabilitiesCurrent_C3BB92EF491809D8AED172B68CC1446C_label_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrent_C3BB92EF491809D8AED172B68CC1446C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_C3BB92EF491809D8AED172B68CC1446C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LiabilitiesCurrent_C3BB92EF491809D8AED172B68CC1446C" xlink:to="lab_us-gaap_LiabilitiesCurrent_C3BB92EF491809D8AED172B68CC1446C" xlink:type="arc"/>
<link:label id="lab_us-gaap_LongTermDebtNoncurrent_6E509EA7AD50EBAAA06672B68CC115D5_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtNoncurrent_6E509EA7AD50EBAAA06672B68CC115D5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Long-term debt, net of current maturities </link:label>
<link:label id="lab_us-gaap_LongTermDebtNoncurrent_6E509EA7AD50EBAAA06672B68CC115D5_label_en-US" xlink:label="lab_us-gaap_LongTermDebtNoncurrent_6E509EA7AD50EBAAA06672B68CC115D5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Long-term Debt, Excluding Current Maturities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtNoncurrent" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_6E509EA7AD50EBAAA06672B68CC115D5" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent_0314184E974DE3AC4D2472B68CC2B14F_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent_0314184E974DE3AC4D2472B68CC2B14F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deferred compensation </link:label>
<link:label id="lab_us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent_0314184E974DE3AC4D2472B68CC2B14F_label_en-US" xlink:label="lab_us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent_0314184E974DE3AC4D2472B68CC2B14F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Compensation Liability, Classified, Noncurrent </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent" xlink:label="loc_us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent_0314184E974DE3AC4D2472B68CC2B14F" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_844456413ABB34B6FDFA72B68CC2EE41_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_844456413ABB34B6FDFA72B68CC2EE41" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Long-term operating lease liabilities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_844456413ABB34B6FDFA72B68CC2EE41" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OtherLiabilitiesNoncurrent_1424C779DEFA53C431D772B68CC2A578_terseLabel_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesNoncurrent_1424C779DEFA53C431D772B68CC2A578" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other long-term liabilities </link:label>
<link:label id="lab_us-gaap_OtherLiabilitiesNoncurrent_1424C779DEFA53C431D772B68CC2A578_label_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesNoncurrent_1424C779DEFA53C431D772B68CC2A578" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Liabilities, Noncurrent </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_1424C779DEFA53C431D772B68CC2A578" xlink:type="locator"/>
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<link:label id="lab_us-gaap_Liabilities_319BAB96754321E753D172B68CC2543C_totalLabel_en-US" xlink:label="lab_us-gaap_Liabilities_319BAB96754321E753D172B68CC2543C" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total Liabilities </link:label>
<link:label id="lab_us-gaap_Liabilities_319BAB96754321E753D172B68CC2543C_label_en-US" xlink:label="lab_us-gaap_Liabilities_319BAB96754321E753D172B68CC2543C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_319BAB96754321E753D172B68CC2543C" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CommitmentsAndContingencies_CEA4D2DDFAD22012623E72B68CC325A6_terseLabel_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingencies_CEA4D2DDFAD22012623E72B68CC325A6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Commitments and Contingencies (Note F) </link:label>
<link:label id="lab_us-gaap_CommitmentsAndContingencies_CEA4D2DDFAD22012623E72B68CC325A6_label_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingencies_CEA4D2DDFAD22012623E72B68CC325A6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Commitments and Contingencies </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="loc_us-gaap_CommitmentsAndContingencies_CEA4D2DDFAD22012623E72B68CC325A6" xlink:type="locator"/>
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<link:label id="lab_us-gaap_StockholdersEquityAbstract_ED2AB838681F8DB9697372B68CC3DD2A_terseLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquityAbstract_ED2AB838681F8DB9697372B68CC3DD2A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stockholders' Equity: </link:label>
<link:label id="lab_us-gaap_StockholdersEquityAbstract_ED2AB838681F8DB9697372B68CC3DD2A_label_en-US" xlink:label="lab_us-gaap_StockholdersEquityAbstract_ED2AB838681F8DB9697372B68CC3DD2A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Stockholders' Equity Attributable to Parent [Abstract] </link:label>
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<link:label id="lab_us-gaap_PreferredStockValue_7E903EF1368B9382671072B68CC380D5_label_en-US" xlink:label="lab_us-gaap_PreferredStockValue_7E903EF1368B9382671072B68CC380D5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Preferred Stock, Value, Issued </link:label>
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<link:label id="lab_us-gaap_AdditionalPaidInCapitalCommonStock_BA8C883F390DA7DD9E4E72B68CC4E27B_terseLabel_en-US" xlink:label="lab_us-gaap_AdditionalPaidInCapitalCommonStock_BA8C883F390DA7DD9E4E72B68CC4E27B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Additional paid-in capital </link:label>
<link:label id="lab_us-gaap_AdditionalPaidInCapitalCommonStock_BA8C883F390DA7DD9E4E72B68CC4E27B_label_en-US" xlink:label="lab_us-gaap_AdditionalPaidInCapitalCommonStock_BA8C883F390DA7DD9E4E72B68CC4E27B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Additional Paid in Capital, Common Stock </link:label>
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<link:label id="lab_us-gaap_RetainedEarningsAccumulatedDeficit_E23B72C91140F36A009E72B68CC491F1_terseLabel_en-US" xlink:label="lab_us-gaap_RetainedEarningsAccumulatedDeficit_E23B72C91140F36A009E72B68CC491F1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Retained earnings </link:label>
<link:label id="lab_us-gaap_RetainedEarningsAccumulatedDeficit_E23B72C91140F36A009E72B68CC491F1_label_en-US" xlink:label="lab_us-gaap_RetainedEarningsAccumulatedDeficit_E23B72C91140F36A009E72B68CC491F1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Retained Earnings (Accumulated Deficit) </link:label>
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<link:label id="lab_us-gaap_TreasuryStockValue_0E625B6D64656206C1D372B68CC4F733_negatedLabel_en-US" xlink:label="lab_us-gaap_TreasuryStockValue_0E625B6D64656206C1D372B68CC4F733" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Treasury stock, 806,018 shares at cost </link:label>
<link:label id="lab_us-gaap_TreasuryStockValue_0E625B6D64656206C1D372B68CC4F733_label_en-US" xlink:label="lab_us-gaap_TreasuryStockValue_0E625B6D64656206C1D372B68CC4F733" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Treasury Stock, Value </link:label>
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<link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_EB67CA6C8BF936F3A6AB72B68CC59058_label_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_EB67CA6C8BF936F3A6AB72B68CC59058" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accumulated Other Comprehensive Income (Loss), Net of Tax </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_EB67CA6C8BF936F3A6AB72B68CC59058" xlink:type="locator"/>
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<link:label id="lab_us-gaap_StockholdersEquity_CFCDDD34436D8AA1809472B68CC5199C_totalLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquity_CFCDDD34436D8AA1809472B68CC5199C" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total Stockholders' Equity </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_CFCDDD34436D8AA1809472B68CC5199C" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquity_70946F05EFE0AEA7E3B172B68CC55E7A_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquity_70946F05EFE0AEA7E3B172B68CC55E7A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities and Equity </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_70946F05EFE0AEA7E3B172B68CC55E7A" xlink:type="locator"/>
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<link:label id="lab_us-gaap_RestrictedStockMember_457FA094D775E613F3F4E7F7A0497642_terseLabel_en-US" xlink:label="lab_us-gaap_RestrictedStockMember_457FA094D775E613F3F4E7F7A0497642" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Restricted Stock </link:label>
<link:label id="lab_us-gaap_RestrictedStockMember_457FA094D775E613F3F4E7F7A0497642_label_en-US" xlink:label="lab_us-gaap_RestrictedStockMember_457FA094D775E613F3F4E7F7A0497642" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restricted Stock [Member] </link:label>
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<link:label id="lab_us-gaap_StatementClassOfStockAxis_338BF0D2D3507B3CF3F1E7F7A04AC657_terseLabel_en-US" xlink:label="lab_us-gaap_StatementClassOfStockAxis_338BF0D2D3507B3CF3F1E7F7A04AC657" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Class of Stock </link:label>
<link:label id="lab_us-gaap_StatementClassOfStockAxis_338BF0D2D3507B3CF3F1E7F7A04AC657_label_en-US" xlink:label="lab_us-gaap_StatementClassOfStockAxis_338BF0D2D3507B3CF3F1E7F7A04AC657" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Class of Stock [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_338BF0D2D3507B3CF3F1E7F7A04AC657" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ClassOfStockDomain_4998B704CA53CC4F9140E7F7A04A1902_terseLabel_en-US" xlink:label="lab_us-gaap_ClassOfStockDomain_4998B704CA53CC4F9140E7F7A04A1902" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Class of Stock </link:label>
<link:label id="lab_us-gaap_ClassOfStockDomain_4998B704CA53CC4F9140E7F7A04A1902_label_en-US" xlink:label="lab_us-gaap_ClassOfStockDomain_4998B704CA53CC4F9140E7F7A04A1902" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Class of Stock [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_4998B704CA53CC4F9140E7F7A04A1902" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ClassOfStockDomain_4998B704CA53CC4F9140E7F7A04A1902" xlink:to="lab_us-gaap_ClassOfStockDomain_4998B704CA53CC4F9140E7F7A04A1902" xlink:type="arc"/>
<link:label id="lab_powl_TimeBasedRestrictedStockUnitMember_F4AA0F7FAF50F6BACF22E7F7A04A5284_terseLabel_en-US" xlink:label="lab_powl_TimeBasedRestrictedStockUnitMember_F4AA0F7FAF50F6BACF22E7F7A04A5284" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Time Based Restricted Stock Unit </link:label>
<link:label id="lab_powl_TimeBasedRestrictedStockUnitMember_F4AA0F7FAF50F6BACF22E7F7A04A5284_label_en-US" xlink:label="lab_powl_TimeBasedRestrictedStockUnitMember_F4AA0F7FAF50F6BACF22E7F7A04A5284" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Time Based Restricted Stock Unit [Member] </link:label>
<link:label id="lab_powl_TimeBasedRestrictedStockUnitMember_F4AA0F7FAF50F6BACF22E7F7A04A5284_documentation_en-US" xlink:label="lab_powl_TimeBasedRestrictedStockUnitMember_F4AA0F7FAF50F6BACF22E7F7A04A5284" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Time based restricted stock unit. </link:label>
<link:loc xlink:href="powl-20200630.xsd#powl_TimeBasedRestrictedStockUnitMember" xlink:label="loc_powl_TimeBasedRestrictedStockUnitMember_F4AA0F7FAF50F6BACF22E7F7A04A5284" xlink:type="locator"/>
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<link:label id="lab_powl_PerformanceBasedRestrictedStockUnitMember_BF6355DF773FB13A28CFE7F7A04A7A50_terseLabel_en-US" xlink:label="lab_powl_PerformanceBasedRestrictedStockUnitMember_BF6355DF773FB13A28CFE7F7A04A7A50" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Performance Based Restricted Stock Unit </link:label>
<link:label id="lab_powl_PerformanceBasedRestrictedStockUnitMember_BF6355DF773FB13A28CFE7F7A04A7A50_label_en-US" xlink:label="lab_powl_PerformanceBasedRestrictedStockUnitMember_BF6355DF773FB13A28CFE7F7A04A7A50" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Performance Based Restricted Stock Unit [Member] </link:label>
<link:label id="lab_powl_PerformanceBasedRestrictedStockUnitMember_BF6355DF773FB13A28CFE7F7A04A7A50_documentation_en-US" xlink:label="lab_powl_PerformanceBasedRestrictedStockUnitMember_BF6355DF773FB13A28CFE7F7A04A7A50" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Performance based restricted stock unit. </link:label>
<link:loc xlink:href="powl-20200630.xsd#powl_PerformanceBasedRestrictedStockUnitMember" xlink:label="loc_powl_PerformanceBasedRestrictedStockUnitMember_BF6355DF773FB13A28CFE7F7A04A7A50" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PlanNameAxis_2270CFC3E2FA61759B86E7F7A04AE36E_terseLabel_en-US" xlink:label="lab_us-gaap_PlanNameAxis_2270CFC3E2FA61759B86E7F7A04AE36E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Plan Name </link:label>
<link:label id="lab_us-gaap_PlanNameAxis_2270CFC3E2FA61759B86E7F7A04AE36E_label_en-US" xlink:label="lab_us-gaap_PlanNameAxis_2270CFC3E2FA61759B86E7F7A04AE36E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Plan Name [Axis] </link:label>
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<link:label id="lab_powl_NonEmployeeDirectorEquityIncentivePlanMember_B0DA9FC22D987174F74AE7F7A04B4F94_terseLabel_en-US" xlink:label="lab_powl_NonEmployeeDirectorEquityIncentivePlanMember_B0DA9FC22D987174F74AE7F7A04B4F94" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Non Employee Director Equity Incentive Plan </link:label>
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<link:label id="lab_us-gaap_VestingDomain_A71FB74CD1EE7EA77FBEE7F7A04B4056_terseLabel_en-US" xlink:label="lab_us-gaap_VestingDomain_A71FB74CD1EE7EA77FBEE7F7A04B4056" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Vesting </link:label>
<link:label id="lab_us-gaap_VestingDomain_A71FB74CD1EE7EA77FBEE7F7A04B4056_label_en-US" xlink:label="lab_us-gaap_VestingDomain_A71FB74CD1EE7EA77FBEE7F7A04B4056" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Vesting [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_VestingDomain" xlink:label="loc_us-gaap_VestingDomain_A71FB74CD1EE7EA77FBEE7F7A04B4056" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VestingDomain_A71FB74CD1EE7EA77FBEE7F7A04B4056" xlink:to="lab_us-gaap_VestingDomain_A71FB74CD1EE7EA77FBEE7F7A04B4056" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationAwardTrancheOneMember_BA0AEBD9524A029211FEE7F7A04B84B0_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationAwardTrancheOneMember_BA0AEBD9524A029211FEE7F7A04B84B0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Immediate Vesting </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationAwardTrancheOneMember_BA0AEBD9524A029211FEE7F7A04B84B0_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationAwardTrancheOneMember_BA0AEBD9524A029211FEE7F7A04B84B0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Payment Arrangement, Tranche One [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationAwardTrancheOneMember" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_BA0AEBD9524A029211FEE7F7A04B84B0" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_BA0AEBD9524A029211FEE7F7A04B84B0" xlink:to="lab_us-gaap_ShareBasedCompensationAwardTrancheOneMember_BA0AEBD9524A029211FEE7F7A04B84B0" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_80144DFB20A312A401BAE7F7A04C3E56_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_80144DFB20A312A401BAE7F7A04C3E56" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Anniversary of Grant Date </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_80144DFB20A312A401BAE7F7A04C3E56_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_80144DFB20A312A401BAE7F7A04C3E56" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Payment Arrangement, Tranche Two [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationAwardTrancheTwoMember" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_80144DFB20A312A401BAE7F7A04C3E56" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_80144DFB20A312A401BAE7F7A04C3E56" xlink:to="lab_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_80144DFB20A312A401BAE7F7A04C3E56" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_A71C038796C348B7784BE7F7A04C2F75_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_A71C038796C348B7784BE7F7A04C2F75" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Vesting period </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_A71C038796C348B7784BE7F7A04C2F75_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_A71C038796C348B7784BE7F7A04C2F75" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_A71C038796C348B7784BE7F7A04C2F75" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_A71C038796C348B7784BE7F7A04C2F75" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_A71C038796C348B7784BE7F7A04C2F75" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_8CDE1E125DCE27254B53E7F7A04CA0AC_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_8CDE1E125DCE27254B53E7F7A04CA0AC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Unvested restricted stock outstanding (in shares) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_8CDE1E125DCE27254B53E7F7A04CA0AC" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_8CDE1E125DCE27254B53E7F7A04CA0AC" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_8CDE1E125DCE27254B53E7F7A04CA0AC" xlink:type="arc"/>
<link:label id="lab_us-gaap_AllocatedShareBasedCompensationExpense_0598B3DDB8946AC92EF6E7F7A04C88BE_terseLabel_en-US" xlink:label="lab_us-gaap_AllocatedShareBasedCompensationExpense_0598B3DDB8946AC92EF6E7F7A04C88BE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Compensation expense </link:label>
<link:label id="lab_us-gaap_AllocatedShareBasedCompensationExpense_0598B3DDB8946AC92EF6E7F7A04C88BE_label_en-US" xlink:label="lab_us-gaap_AllocatedShareBasedCompensationExpense_0598B3DDB8946AC92EF6E7F7A04C88BE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Payment Arrangement, Expense </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_0598B3DDB8946AC92EF6E7F7A04C88BE" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AllocatedShareBasedCompensationExpense_0598B3DDB8946AC92EF6E7F7A04C88BE" xlink:to="lab_us-gaap_AllocatedShareBasedCompensationExpense_0598B3DDB8946AC92EF6E7F7A04C88BE" xlink:type="arc"/>
<link:label id="lab_powl_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualSharesIssuable_C0A4CCDCBBCCEA503ADEE7F7A04D7785_terseLabel_en-US" xlink:label="lab_powl_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualSharesIssuable_C0A4CCDCBBCCEA503ADEE7F7A04D7785" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Shares issued under the plan (in shares) </link:label>
<link:label id="lab_powl_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualSharesIssuable_C0A4CCDCBBCCEA503ADEE7F7A04D7785_label_en-US" xlink:label="lab_powl_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualSharesIssuable_C0A4CCDCBBCCEA503ADEE7F7A04D7785" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share Based Compensation Arrangement By Share Based Payment Award Annual Shares Issuable </link:label>
<link:label id="lab_powl_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualSharesIssuable_C0A4CCDCBBCCEA503ADEE7F7A04D7785_documentation_en-US" xlink:label="lab_powl_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualSharesIssuable_C0A4CCDCBBCCEA503ADEE7F7A04D7785" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Share-based compensation arrangement by share-based payment award annual shares issuable. </link:label>
<link:loc xlink:href="powl-20200630.xsd#powl_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualSharesIssuable" xlink:label="loc_powl_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualSharesIssuable_C0A4CCDCBBCCEA503ADEE7F7A04D7785" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_powl_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualSharesIssuable_C0A4CCDCBBCCEA503ADEE7F7A04D7785" xlink:to="lab_powl_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualSharesIssuable_C0A4CCDCBBCCEA503ADEE7F7A04D7785" xlink:type="arc"/>
<link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_1951D351F597253147A9E7F7A04D84B4_terseLabel_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_1951D351F597253147A9E7F7A04D84B4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Vesting, percentage </link:label>
<link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_1951D351F597253147A9E7F7A04D84B4_label_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_1951D351F597253147A9E7F7A04D84B4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_1951D351F597253147A9E7F7A04D84B4" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_1951D351F597253147A9E7F7A04D84B4" xlink:to="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_1951D351F597253147A9E7F7A04D84B4" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_2E181E9C0D2FE294AEEDE7F7A04DE775_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_2E181E9C0D2FE294AEEDE7F7A04DE775" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Restricted stock issued (in shares) </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_2E181E9C0D2FE294AEEDE7F7A04DE775_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_2E181E9C0D2FE294AEEDE7F7A04DE775" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_2E181E9C0D2FE294AEEDE7F7A04DE775" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_2E181E9C0D2FE294AEEDE7F7A04DE775" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_2E181E9C0D2FE294AEEDE7F7A04DE775" xlink:type="arc"/>
<link:label id="lab_us-gaap_SharesIssuedPricePerShare_D3D71BF8909BCE5C4C21E7F7A04DDDDB_terseLabel_en-US" xlink:label="lab_us-gaap_SharesIssuedPricePerShare_D3D71BF8909BCE5C4C21E7F7A04DDDDB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Shares issued, price per share (in shares) </link:label>
<link:label id="lab_us-gaap_SharesIssuedPricePerShare_D3D71BF8909BCE5C4C21E7F7A04DDDDB_label_en-US" xlink:label="lab_us-gaap_SharesIssuedPricePerShare_D3D71BF8909BCE5C4C21E7F7A04DDDDB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Shares Issued, Price Per Share </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharesIssuedPricePerShare" xlink:label="loc_us-gaap_SharesIssuedPricePerShare_D3D71BF8909BCE5C4C21E7F7A04DDDDB" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SharesIssuedPricePerShare_D3D71BF8909BCE5C4C21E7F7A04DDDDB" xlink:to="lab_us-gaap_SharesIssuedPricePerShare_D3D71BF8909BCE5C4C21E7F7A04DDDDB" xlink:type="arc"/>
<link:label id="lab_us-gaap_LesseeOperatingLeasesTextBlock_A0BF966D2ECBC8CACA18E7F79F995AE4_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeasesTextBlock_A0BF966D2ECBC8CACA18E7F79F995AE4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Leases </link:label>
<link:label id="lab_us-gaap_LesseeOperatingLeasesTextBlock_A0BF966D2ECBC8CACA18E7F79F995AE4_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeasesTextBlock_A0BF966D2ECBC8CACA18E7F79F995AE4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Leases [Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeasesTextBlock" xlink:label="loc_us-gaap_LesseeOperatingLeasesTextBlock_A0BF966D2ECBC8CACA18E7F79F995AE4" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeasesTextBlock_A0BF966D2ECBC8CACA18E7F79F995AE4" xlink:to="lab_us-gaap_LesseeOperatingLeasesTextBlock_A0BF966D2ECBC8CACA18E7F79F995AE4" xlink:type="arc"/>
<link:label id="lab_us-gaap_AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock_5798C6D2C727CD220457E7F7A0251718_terseLabel_en-US" xlink:label="lab_us-gaap_AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock_5798C6D2C727CD220457E7F7A0251718" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Activity in Allowance for Doubtful Accounts Receivable </link:label>
<link:label id="lab_us-gaap_AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock_5798C6D2C727CD220457E7F7A0251718_label_en-US" xlink:label="lab_us-gaap_AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock_5798C6D2C727CD220457E7F7A0251718" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Financing Receivable, Allowance for Credit Loss [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock" xlink:label="loc_us-gaap_AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock_5798C6D2C727CD220457E7F7A0251718" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock_5798C6D2C727CD220457E7F7A0251718" xlink:to="lab_us-gaap_AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock_5798C6D2C727CD220457E7F7A0251718" xlink:type="arc"/>
<link:label id="lab_us-gaap_ScheduleOfInventoryCurrentTableTextBlock_684EB497EDD04ABD48B8E7F7A0258C52_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfInventoryCurrentTableTextBlock_684EB497EDD04ABD48B8E7F7A0258C52" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Components of Inventories </link:label>
<link:label id="lab_us-gaap_ScheduleOfInventoryCurrentTableTextBlock_684EB497EDD04ABD48B8E7F7A0258C52_label_en-US" xlink:label="lab_us-gaap_ScheduleOfInventoryCurrentTableTextBlock_684EB497EDD04ABD48B8E7F7A0258C52" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Inventory, Current [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfInventoryCurrentTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfInventoryCurrentTableTextBlock_684EB497EDD04ABD48B8E7F7A0258C52" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfInventoryCurrentTableTextBlock_684EB497EDD04ABD48B8E7F7A0258C52" xlink:to="lab_us-gaap_ScheduleOfInventoryCurrentTableTextBlock_684EB497EDD04ABD48B8E7F7A0258C52" xlink:type="arc"/>
<link:label id="lab_us-gaap_ScheduleOfProductWarrantyLiabilityTableTextBlock_9AC09E09625DB5E351EFE7F7A0259A5D_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfProductWarrantyLiabilityTableTextBlock_9AC09E09625DB5E351EFE7F7A0259A5D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Activity in Product Warranty Accrual </link:label>
<link:label id="lab_us-gaap_ScheduleOfProductWarrantyLiabilityTableTextBlock_9AC09E09625DB5E351EFE7F7A0259A5D_label_en-US" xlink:label="lab_us-gaap_ScheduleOfProductWarrantyLiabilityTableTextBlock_9AC09E09625DB5E351EFE7F7A0259A5D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Product Warranty Liability [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfProductWarrantyLiabilityTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfProductWarrantyLiabilityTableTextBlock_9AC09E09625DB5E351EFE7F7A0259A5D" xlink:type="locator"/>
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2 Previous Filings that this Filing References

  As Of               Filer                 Filing    For·On·As Docs:Size             Issuer                      Filing Agent

10/12/12  Powell Industries Inc.            8-K:3,5,9  10/09/12    2:150K                                   Donnelley … Solutions/FA
11/01/04  Powell Industries Inc.            8-A12B/A               4:412K
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