Molded case circuit breaker having movable contact finger releas

Details Molded case circuit breaker having movable contact finger releas Molded case circuit breaker having movable contact finger releas

1995-06-19

1996-05-14

Donovan, Lincoln

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

335147, 218 22, 218 27, H01H 7500

Patent

active

055171648

ABSTRACT:
A subframe is coaxially pivotally mounted with a movable frame of the operating mechanism of a molded case circuit breaker and is locked to the frame by a bell crank pawl which is pivotally mounted on the subframe. A leaf spring assembly rigidly attached to the subframe overlies the movable contact finger to engage the same in the circuit ON condition of the circuit breaker to provide desired contact force. The bell crank pawl is released upon an incrementally small amount of initial movement of the movable contact arm in response to blow-open magnetic repulsion forces to release the movable contact finger for pivotal opening movement relative to the movable frame of the circuit breaker operating mechanism.

REFERENCES:
patent: 3505622 (1970-04-01), Strobel
patent: 3559119 (1971-01-01), Koennecke et al.
patent: 5430420 (1995-07-01), Maier

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