Circuit breaker having an electronic fault sensing and trip init

Details Circuit breaker having an electronic fault sensing and trip init Circuit breaker having an electronic fault sensing and trip init

1978-03-15

1980-06-24

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

H02H 308

Patent

active

042098181

ABSTRACT:
A circuit breaker having an electronic fault sensing and trip initiating unit which provides increased versatility and ability to coordinate the circuit breaker with other interrupting and protective devices in a wide variety of electrical distribution systems. Electronic circuits and components are provided to vary the ampere rating of the breaker, to adjust current carrying capacity, to provide a long time delay trip, a short time delay trip and an instantaneous trip depending on the amplitude of high fault currents, to provide a ground fault trip, to shorten or lengthen the trip time for short time delay faults and for ground faults, and to provide shunt trip capability. The tripping mechanism is magnetic and mechanical, and includes a plunger movable between a trip and non-trip position controlled by an electronic switch in the electronic circuitry, and a toggle mechanism which is unlatched by the plunger when it moves to the trip position. A bimetal trip mechanism is provided as back-up protection if the ambient temperature not sensed by the electronic circuitry exceeds a pre-determined level.

REFERENCES:
patent: 3786311 (1974-01-01), Hobson, Jr. et al.
patent: 4105965 (1978-08-01), Russell
"New Molded-Case Circuit Breakers Having Easy Selection of Continuous Current Rating," Westinghouse Engr., vol. 33, No. 4, Jul. 1973, pp. 106-111.

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