Molded case circuit breaker with movable upper electrical...

Details Molded case circuit breaker with movable upper electrical... Molded case circuit breaker with movable upper electrical...

H - Electricity

01

H

306/60

H01H 71/10 (2006.01) H01H 77/10 (2006.01)

Patent

CA 1230626

A molded case circuit breaker includes a movable upper electrical contact having a base por- tion with a slot formed therein for releasably re- ceiving a portion of an elongated spring biased lock- ing pin disposed in a rotatable cross bar of an oper- ating mechanism of the circuit breaker. The locking pin is biased in the slot by a pair of tension springs secured to the cross bar, enabling the upper electrical contact to move in unison with the cross bar. Upon the occurrence of a high level short cir- cuit or fault current of sufficient magnitude, the pin is displaced from the slot enabling the independ- ent rotational movement of the upper contact arm. During such movement, an elongated leaf spring is downwardly deflected and then released by the base portion. Subsequently, the upper electrical contact is prevented from contacting the lower electrical contact by the engagement of the leaf spring with the base portion. A subsequent trip operation of the operating mechanism removes the latching feature of the leaf spring.

472676

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