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