Issue:
Application

Product Line:
HD Safety Switch

Cause:
Application

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 30 and 60 A F-Series Safety Switches exceed the UL and NEMA requirements by more than 3 times the total (see below table):

NUMBER OF OPERATIONS
Square D Safety Switches (F-series)
30A-60A, Heavy Duty

Endurance Test # of Ops				HP Test # of Ops
Test Standard	At Rated Load*	No Load	Total (L + NL)	At Rated HP**
UL	6000	4000	10000	50
NEMA	8000	7000	15000	50
Square D	8000	42000	50000	50

* endurance test done at switch rated load current
** horsepower test - make/break motor inrush/locked rotor current at rated HP
For 100A series F Heavy Duty safety switches, see FA99790
For 200A series F Heavy Duty safety switches, see FA99791
For 400A series E Heavy Duty safety switches, see FA99792
For 600A series E Heavy Duty safety switches, see FA99819
For 800A series E Heavy Duty safety switches, see FA99821
For 1200A series E Heavy Duty safety switches, see FA99822

Released for: Schneider Electric USA