Current limiting type circuit breaker

Details Current limiting type circuit breaker Current limiting type circuit breaker

1986-03-13

1987-02-17

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

335195, H01H 7710

Patent

active

046443070

ABSTRACT:
A current limiting type circuit breaker includes first and second contact arms each pivotally mounted so as to be driven to an open position by an electromagnetic repulsive force, a trip device responsive to an output from a means for detecting a fault to drive the second contact arm to the open position, magnetic substances placed at opposite sides of the contact arms so that the magnetic resistance for magnetic fluxes occurred around the contact arms is decreased, and an attracting stationary conductor placed near the free end of the second contact arm in the open position. The attracting stationary conductor is connected in series with the first contact arm. When an excessive current flows through the contact arms, an electromagnetic attractive force is generated between the attracting stationary conductor and the second contact arm, which force increases the rate at which the second contact arm is moved to the open position.

REFERENCES:
patent: 3815059 (1974-06-01), Spoelman

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