Shunt trip device

Details Shunt trip device Shunt trip device

1993-09-13

1995-05-09

Donovan, Lincoln

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Plural magnets or flux sources

335177, H01H 900

Patent

active

054143969

ABSTRACT:
A shunt trip device includes an armature 18 pivotally mounted on a frame 12 of a ferro-magnetic material. A "U"-shaped member 20 is mounted on the frame 12 via a spacer 30 of a non-magnetic material. The member 20 and a portion of a post 16 of the frame 12 and the armature 18 define a first magnetic circuit. A limb 22 and a bridge portion 26 of the member 20 together with a part 14.1 and the post 16 of the frame and the armature 18 define a second magnetic circuit. A limb 24 and the bridge 26 of the member 20 together with the part 14.1 and the post 16 of the frame 12 and that portion of the armature 18 between the post 16 and the limb 24 define a third magnetic circuit. A coil 34 is carried on the limb 22 of the member 20 and permanent magnetic 22 is sandwiched between the portion 26 of the member 20 and the part 14.1 of the frame 12.

REFERENCES:
patent: 3614689 (1971-10-01), Canonne
patent: 4808952 (1989-02-01), Berner et al.
patent: 4931758 (1990-06-01), Bagalini
patent: 5006826 (1991-04-01), Knoben et al.

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