Circuit breaker responsive to repeated in-rush currents...

Details Circuit breaker responsive to repeated in-rush currents... Circuit breaker responsive to repeated in-rush currents...

H - Electricity

01

H

H01H 47/00 (2006.01) H02H 1/00 (2006.01) H02H 1/04 (2006.01) H02H 3/33 (2006.01) H02H 3/44 (2006.01)

Patent

CA 2116496

Abstract of the Disclosure A circuit breaker responds to sputtering arc faults by counting the times that a bandwidth limited di/dt signal exceeds a threshold magnitude within a selected time internal In the exemplary circuit breaker, if the threshold is exceeded twice within a one second interval, a trip solenoid is energized. The di/dt sensor can share a sensing coil with a ground fault detector. Alternatively, the resistance of the neutral lead within the circuit breaker is utilized to sense current which is converted to a bandwidth limited di/dt signal for level detection and counting of sputtering arc events.

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