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 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
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
