Electrical circuit breaker protection device

Details Electrical circuit breaker protection device Electrical circuit breaker protection device

1990-02-12

1992-03-10

Stephan, Steven L.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 93, H02H 308

Patent

active

050953982

ABSTRACT:
An equipment protection device for a multi pole circuit breaker includes a trip coil, having a plunger with a tang, in an adapter housing that is attached to the breaker housing for tripping the breaker load contacts by means of the tang. The tang extends through an aperture in the side of the breaker. The trip coil is controlled by a toroid that is in a remote housing, displaced from the breaker housing and which includes a sensing winding on the magnetic core of the toroid. A ground fault carrying conductor is passed through the toroid window and connects the neutral of the breaker panel to an earth ground. A test button on the adapter housing completes a circuit for supplying current to a test winding on the toroid to simulate a ground fault condition. The trip coil has two independent windings that are individually connected to the load contacts of the breaker such that either winding can operate the trip coil.

REFERENCES:
patent: 3812400 (1974-05-01), Gryctko et al.
patent: 3855502 (1974-12-01), Pardue et al.
patent: 3999103 (1976-12-01), Misencik et al.
patent: 4208689 (1980-06-01), Dunham
patent: 4568899 (1986-02-01), May et al.
patent: 4641217 (1987-02-01), Morris et al.
patent: 4667263 (1987-05-01), Morris et al.
patent: 4933801 (1990-06-01), Glennon
patent: 5016135 (1991-05-01), Zylstra

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