Flux-transfer trip device for a circuit breaker

Details Flux-transfer trip device for a circuit breaker Flux-transfer trip device for a circuit breaker

1974-12-23

1976-03-16

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Tripping means

335229, 335254, H01H 920

Patent

active

039449572

ABSTRACT:
This trip device comprises a permanent magnet of cobalt-rare earth material and a plunger which is normally held in a withdrawn position by the permanent magnet. A tripping coil surrounds the plunger and, upon energization, develops tripping flux that opposes the holding flux from the permanent magnet, thereby to effect release of the plunger. In a position between the tripping coil and the permanent magnet, flux-diverting structure of highly permeable magnetic material is provided for shunting a portion of the tripping flux through a shunt path bypassing the permanent magnet. This shunt path contains a relatively large non-magnetic gap for limiting the tripping flux through the shunt path sufficiently to cause 30 percent or more of the tripping flux to pass through the permanent magnet in a direction opposite to the direction of the holding flux. When the tripping coil is deenergized, this non-magnetic gap limits the holding flux through the shunt path to 10 percent or less of the total holding flux of the permanent magnet.

REFERENCES:
patent: 3693122 (1972-09-01), Willard
patent: 3755766 (1973-08-01), Read, Jr.

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