Contact control assembly for a circuit breaker

Details Contact control assembly for a circuit breaker Contact control assembly for a circuit breaker

1977-06-08

1979-04-10

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

335176, 335193, 335201, H01H 7302

Patent

active

041491297

ABSTRACT:
The following specification describes a magnetic assembly for use in controlling the main contacts of a circuit breaker. The magnetic assembly includes a yoke, an armature for attraction to the yoke to move an operating lever and a pivotable adjustment arm. The lever operates the trip crossbar, which opens the main contacts and is in turn pivotably carried by the adjustment arm. One end of the operating lever is held against longitudinal movement relative the trip crossbar, when the adjustment arm is pivoted to calibrate the circuit breaker. The lever therefore pivots on the adjustment arm to move the armature towards or from the yoke to control the armature air gap without altering the lever travel distance to the crossbar. The armature is also mounted on the lever for relatively linear movement in relationship to the yoke. The main contacts include a stationary contact, which is engaged by the mass of a spring supported floating arc quenching magnet that serves to absorb the shock of contact closure for reducing contact bounce.

REFERENCES:
patent: 1053489 (1913-02-01), Frost
patent: 3588412 (1971-06-01), Koennecke et al.
patent: 3849619 (1974-11-01), Patel
patent: 3943473 (1976-03-01), Khalid

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