Magnetically latched ground fault circuit interrupter

Details Magnetically latched ground fault circuit interrupter Magnetically latched ground fault circuit interrupter

1975-10-24

1977-12-13

Miller, J D

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361114, 361155, H02H 328

Patent

active

040632997

ABSTRACT:
A ground fault circuit interrupter (GFI) in which a load circuit is energized through a normally closed magnetically latchable circuit breaker. When no fault exists that is of sufficient magnitude to actuate the GFI, the latching coil of the circuit breaker is ineffective, whereby the circuit breaker remains closed. The coil is connected to the amplified DC output of a ground fault sensing circuit and is energized in a certain sense to open the circuit breaker upon the occurrence of a fault, the circuit breaker then being magnetically latched open. A capacitor is continuously DC charged in a certain sense by the AC supply line through a rectifier. To reset the circuit breaker the capacitor is selectively connected across the coil to discharge a pulse of a sufficient magnitude in a proper sense to reversely energize the coil enough to release the magnetic latch and allow the circuit breaker to reclose. The GFI is tested by closing a circuit that simulates a fault of the low magnitude which is to be sensed. Where additional circuits are protected by the same GFI they may be provided with resetting and testing equipment that are slaved to the GFI.

REFERENCES:
patent: 3376477 (1968-04-01), Weinger
patent: 3617808 (1971-11-01), Yoder
patent: 3683239 (1972-08-01), Sturman
patent: 3721862 (1973-03-01), Brennen et al.
patent: 3761774 (1973-09-01), Laughinghouse et al.
patent: 3769548 (1973-10-01), Pardue
patent: 3840783 (1974-10-01), Eckart

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