Narrow multi-pole circuit breaker having bodily movable instanta

Details Narrow multi-pole circuit breaker having bodily movable instanta Narrow multi-pole circuit breaker having bodily movable instanta

1975-03-04

1976-05-25

Miller, J. D.

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

335 38, 335174, H01H 75100, H01H 77100

Patent

active

039597520

ABSTRACT:
A plurality of single pole circuit breakers stacked side-by-side are interconnected by a tie rod connecting the magnetic armatures of their respective instantaneous trip means. When one pole is caused to trip because of a fault condition a driving cam formation on the releasable cradle of the faulted pole engages the armature moving it in the tripping direction substantially beyond the point required for releasing the cradle latch in the faulted phase. Substantial movement beyond cradle release is permitted even though the magnetic air gap at the armature is small in that after this gap is closed the magnet is moved bodily in the tripping direction. This added movement assures that the tie rod shall transmit sufficient motion to all non-faulted poles to cause tripping thereof.

REFERENCES:
patent: 2703351 (1955-03-01), Hulbert
patent: 3147353 (1964-09-01), Leonard
patent: 3204063 (1965-08-01), Nash et al.
patent: 3288965 (1966-11-01), Klein
patent: 3401363 (1968-09-01), Vyskocil et al.
patent: 3908154 (1975-09-01), Gryctko

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