Circuit breaker trip indicator and auxiliary switch combination

Details Circuit breaker trip indicator and auxiliary switch combination Circuit breaker trip indicator and auxiliary switch combination

1979-09-04

1981-02-17

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Tripping means

335229, H01H 920, H01F 708

Patent

active

042517893

ABSTRACT:
A plunger is normally held in a retracted, non-indicating position by a permanent magnet against the force of a spring biasing the plunger to an extended, indicating position protruding through an indicator cap. An electromagnet is selectively energized to develop flux in opposition to the magnet holding flux, whereupon the plunger pops to its indicating position. The cap internally mounts a pair of contacts which are bridged by a plunger mounted shorting ring incident with the plunger assuming its indicating position, thereby completing an external electrical indication circuit.

REFERENCES:
patent: 3693122 (1972-09-01), Willard
patent: 3755766 (1973-08-01), Read, Jr.
patent: 3783423 (1974-01-01), Mater et al.
patent: 3893052 (1975-07-01), Kotos et al.
patent: 3944957 (1976-03-01), Kotos et al.
patent: 4072918 (1978-02-01), Read, Jr.

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