What are the standard test that a UL489 circuit breaker must pass?

How can we help you today?

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