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 performed at switch rated load current
**Horsepower test - make/break motor inrush/locked rotor current at rated HP
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 Operations | HP Test Number of Operations | |||
| Test Standard | At Rated Load* | No Load | Total (L+NL) | At Rated HP** |
| UL | 6000 | 4000 | 10000 | 50 |
| NEMA | 6000 | 4000 | 10000 | 50 |
| Square D | 6000 | 24000 | 30000 | 50 |
**Horsepower test - make/break motor inrush/locked rotor current at rated HP
Released for: Schneider Electric USA
Need help?
Product Selector
Quickly and easily find the right products and accessories for your applications.
Get a Quote
Start your sales inquiry online and an expert will connect with you.
Where to buy?
Easily find the nearest Schneider Electric distributor in your location.
Help Center
Find support resources for all your needs, in one place.
