Circuit breaker using bimetal of thermal-magnetic trip to...

Details Circuit breaker using bimetal of thermal-magnetic trip to... Circuit breaker using bimetal of thermal-magnetic trip to...

H - Electricity

01

H

H01H 71/16 (2006.01) H02H 1/00 (2006.01)

Patent

CA 2162350

In a circuit breaker having a thermal-magnetic trip, the voltage across the bimetal is used to sense load currents. This voltage signal representative of current through the bimetal can be used as an input to an arcing fault detector. The signal is converted to a bandwidth limited di/dt signal. If the magnitude of the di/dt signal exceeds a threshold indicative of the onset of an arc a predetermined number of times within a given interval. the circuit breaker is tripped. The voltage across the bimetal can also be used in other devices requiring a measure of load current such as, for example, a meter or an overcurrent alarm.

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