Circuit breaker including magnetic trip mechanism

Details Circuit breaker including magnetic trip mechanism Circuit breaker including magnetic trip mechanism

2005-04-12

2005-04-12

Donovan, Lincoln (Department: 2832)

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

C335S172000

Reexamination Certificate

active

06879228

ABSTRACT:
A circuit breaker includes separable contacts and an operating mechanism having a cradle for opening and closing the separable contacts. A trip mechanism cooperates with the cradle of the operating mechanism to trip open the separable contacts. The trip mechanism includes a bimetal conductor, which is electrically connected in series with the separable contacts. The trip mechanism is responsive to a predetermined condition of current flowing in the bimetal conductor. The trip mechanism also includes a magnetic yoke coupled to the bimetal conductor, an armature pivotally mounted to the magnetic yoke, and a spring biasing the armature away from the magnetic yoke. The spring is set apart from the bimetal conductor. The spring is coupled to the armature and engages the magnetic member.

REFERENCES:
patent: 5381120 (1995-01-01), Arnold et al.
patent: 5805038 (1998-09-01), Palmer et al.
patent: 5872495 (1999-02-01), DiMarco et al.
patent: 6255924 (2001-07-01), Turner et al.
patent: 6259341 (2001-07-01), Juds et al.
patent: 6633211 (2003-10-01), Zindler et al.

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