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What is the rating of the number of switching operations of Square D, 100 A, general duty, F-Series safety switches?
Issue:
Product Design Features

Product Line:
General Duty Safety Switches

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):
Endurance Test Number of OperationsHP Test Number of Operations
Test StandardAt Rated Load*No LoadTotal (L+NL)At Rated HP**
UL600040001000050
NEMA600040001000050
Square D6000240003000050
*Endurance test performed at switch rated load current
**Horsepower test - make/break motor inrush/locked rotor current at rated HP

Schneider Electric USA

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