Electromagnetic trip device with tripping threshold adjustment

Details Electromagnetic trip device with tripping threshold adjustment Electromagnetic trip device with tripping threshold adjustment

1989-01-18

1990-07-03

Picard, Leo P.

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

335174, H01H 7510

Patent

active

049394924

ABSTRACT:
The tripping adjustment range of a magnetic trip device with a plunger core is increased by providing, in the movable plunger core, a groove whose edges define polar surfaces bounding air-gaps with the edges of the yoke in such a way as to generate in the minimum adjustment position a force which is added to the attractive force of the movable core by the stationary core, and inversely a force in the maximum adjustment position which is subtracted from the attractive force of movable plunger core. The trip device excitation coil is offset with respect to the yoke to increase the adjustment range, and a return device with adjustable stop and decreasing return force as the movable core approaches the stationary core, contributes to increasing this tripping threshold adjustment range.

REFERENCES:
patent: 905136 (1908-12-01), Barnum
patent: 1354810 (1920-10-01), Canfield
patent: 3505623 (1970-04-01), Gryctko
patent: 4278959 (1987-07-01), Nishimiya et al.
patent: 4603312 (1986-07-01), Conner

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