Trip device for an electrical switch and an electrical switch wi

Details Trip device for an electrical switch and an electrical switch wi Trip device for an electrical switch and an electrical switch wi

1990-01-03

1991-04-09

Picard, Leo P.

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

335172, 335 23, 335179, H01H 7512

Patent

active

050068261

ABSTRACT:
Trip device of the suction or pull-in armature type, having a yoke (18; 35) supporting a fixed permanent magnet (22) and a movable elongated armature (23) having a head member (25). The armature (23) and the yoke (18; 35) forming a first magnetic circuit for holding the armature (23) in a first position with the permanent magnet (22), in which first position the head member (25) protrudes outside the yoke (18; 35). For moving the armature (23) electromagnetically and/or electrothermally to a second position in which the head member (25) protrudes further outside the yoke (18; 35), the yoke (18; 35) is provided with electrothermal bimetal device (33; 37). For moving the armature (23) to the second position independently of the polarity of an electrical current, a second magnetic circuit is provided, consisting of a further yoke and one or more magnet windings (30), or consisting of a pair of mutually magnetically separate branches (44, 45; 50, 51) magnetically connected in series with the first magnetic circuit, and one or more magnet windings (46) for mutually oppositely magnetizing the branches (44, 45; 50, 51).

REFERENCES:
patent: 3534304 (1970-10-01), Robinson
patent: 4288770 (1981-09-01), Gillette
patent: 4595895 (1986-06-01), Fujii et al.
patent: 4731692 (1988-03-01), Dvorak et al.
patent: 4808952 (1989-02-01), Berner et al.

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