Issue:
Application
Product Line:
HD Safety Switch
Resolution:
For safety switches, the standard for design and testing of the number of switching operations is governed by UL98 and NEMA KS-1.There are two separate tests: (1) endurance test, and (2) horsepower-overload test. The below table shows the minimum number of operations required (OFF to ON to OFF) by UL and NEMA. For the endurance test, however, Square D F-series safety switches exceed the UL and NEMA requirements by up to 3 times the total (see below table).
NUMBER OF OPERATIONS:
* endurance test done at switch rated Load current
** horsepower test - make/break motor inrush/locked rotor current at rated HP
Application
Product Line:
HD Safety Switch
Resolution:
For safety switches, the standard for design and testing of the number of switching operations is governed by UL98 and NEMA KS-1.There are two separate tests: (1) endurance test, and (2) horsepower-overload test. The below table shows the minimum number of operations required (OFF to ON to OFF) by UL and NEMA. For the endurance test, however, Square D F-series safety switches exceed the UL and NEMA requirements by up to 3 times the total (see below table).
NUMBER OF OPERATIONS:
* endurance test done at switch rated Load current
** horsepower test - make/break motor inrush/locked rotor current at rated HP
Released for:Schneider Electric USA
