Overcurrent trip for circuit breakers

Details Overcurrent trip for circuit breakers Overcurrent trip for circuit breakers

1998-11-17

1999-10-26

Picard, Leo P.

Electricity: electrothermally or thermally actuated switches

With diverse art-type actuator for single switch

Bimetallic with other

337333, 337299, 337 3, 337 12, 335 36, 335 35, 335145, H01H 7512, H01H 3752, H01H 3702

Patent

active

059735856

ABSTRACT:
An overcurrent trip (1) for circuit breakers or motor safety switches has a very short reaction time. The short reaction time is achieved by connecting a bimetal snap-action disk (8) to the heating device (7) in such a way that its central region is always in contact with the heating device (7), irrespective of creeping movement. This heating device (7) is formed by a ferromagnetic core (5) on which the magnet winding (12) is directly fitted, without a further yoke, which magnetic winding simultaneously serves as the heating winding. The bimetal snap-action disk (8) is held on this heating device (7) with the aid of the electromagnetically actuated rod (21), while a plunger (43) which coaxially surrounds the electromagnetically actuated rod is moved by the bimetal snap-action disk (8).

REFERENCES:
patent: Re33400 (1990-10-01), Fuji et al.
patent: 4288769 (1981-09-01), Howell
patent: 4288770 (1981-09-01), Gillette
patent: 4595895 (1986-06-01), Fujii et al.
patent: 4641001 (1987-02-01), Fujihisa et al.
patent: 5006826 (1991-04-01), Knoben et al.
patent: 5103198 (1992-04-01), Morel et al.
patent: 5107235 (1992-04-01), Torres-Isea
patent: 5499007 (1996-03-01), Flohr

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