Automatic trip device for circuit interrupter

Details Automatic trip device for circuit interrupter Automatic trip device for circuit interrupter

1980-04-24

1982-08-10

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Tripping means

335128, 335276, H01H 920

Patent

active

043440550

ABSTRACT:
An automatic trip device for a circuit breaker includes a U-shaped stationary iron core disposed around a current-carrying conductor. The stationary core includes a semicircular recess on one leg thereof having V-shaped bearing surfaces formed at each end of the recess. A movable iron core is positioned across the legs of the stationary core and includes semicircular projection fitted into the recess of the stationary core. A shaft extends through the projection and pivots at each end in one of the V-shaped bearing surfaces. Tension springs connected between the stationary core and one end of the movable core produce opening rotational bias on the movable core. Electromagnetic force produced by an over-current flow through the conductor causes closing rotational movement of the movable core. The disclosed construction results in elimination of undesireable sound vibrations produced in prior art devices under conditions of current flow below overload level.

REFERENCES:
patent: 2284621 (1942-06-01), Kuhn et al.
patent: 3296564 (1967-01-01), Cellerini

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