What are the standard test that a UL489 circuit breaker must pass?
Issue:
UL Requirements
Product Line:
Circuit Breakers UL 489
Resolution:
For electronic trip circuit breakers and uncompensated thermal-magnetic circuit breakers rated 40°C, the test sequences are as shown below:
200% calibration at 25°C (77°F)
135% calibration at 25°C (77°F)
Calibration of adjustable instantaneous trip
Overload
Tungsten lamp load
100% calibration at 40°C (104°F)
Temperature and 100% calibration at 25°C (77°F)
Endurance
200% calibration at 25°C (77°F) repeated
135% calibration at 25°C (77°F) repeated
Interrupting ability (Y sequence)
Interrupting ability (Z sequence)
200% trip out at 25°C (77°F)
Dielectric voltage withstand
UL Requirements
Product Line:
Circuit Breakers UL 489
Resolution:
For electronic trip circuit breakers and uncompensated thermal-magnetic circuit breakers rated 40°C, the test sequences are as shown below:
200% calibration at 25°C (77°F)
135% calibration at 25°C (77°F)
Calibration of adjustable instantaneous trip
Overload
Tungsten lamp load
100% calibration at 40°C (104°F)
Temperature and 100% calibration at 25°C (77°F)
Endurance
200% calibration at 25°C (77°F) repeated
135% calibration at 25°C (77°F) repeated
Interrupting ability (Y sequence)
Interrupting ability (Z sequence)
200% trip out at 25°C (77°F)
Dielectric voltage withstand
Released for: Schneider Electric USA
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