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What is the rating of the number of switching operations of Square D, 30 - 60A, General Duty, E-Series Safety Switches? These ratings are also sometimes referred to as Endurance operations and Horsepower-overload operations.

Issue:
Application

Product Line:
GD 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. (see below table):

NUMBER OF OPERATIONS Square D Safety Switches 30 - 60A, General Duty (E-series):
Endurance test number of operations:
test standards rated Load* No-Load total (L + NL)
UL 6000 4000 10000 
* endurance test done at switch rated Load current
HP test number of operations:
at rated HP**
50
** horsepower test - make/break motor inrush/locked rotor current at rated HP
 
Number of switching operations for other General Duty safety switches:
For 30-60A series F General Duty safety switches, see FA99707
For 100A series F General Duty safety switches, see FA99734
For 200A series F General Duty safety switches, see FA99735
For 400A series E General Duty safety switches, see FA99736
For 600A series E General Duty safety switches, see FA99737
For 800A series E General Duty safety switches, see FA99761
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