Molded case circuit breaker with resettable combined...

Details Molded case circuit breaker with resettable combined... Molded case circuit breaker with resettable combined...

H - Electricity

01

H

306/81

H01H 83/12 (2006.01) H01H 71/12 (2006.01)

Patent

CA 1234852

39 51,597 ABSTRACT OF THE DISCLOSURE A molded case circuit breaker includes a manually resettable undervoltage trip mechanism for initiating a trip operation of the circuit breaker upon an undervoltage condition. The undervoltage trip mechanism includes a solenoid having a fixed electrical coil surrounding a pair of separable mov- able ferromagnetic plungers. Disposed between and captured by the two plungers is a compression spring for physically separating the two plungers upon the occurrence of an undervoltage condition. Upon such an undervoltage condition, one of the plungers is positioned to engage and rotate a trip lever for ini- tiating a trip operation of the circuit breaker. The other plunger is secured to an elongated manually depressible reset button that extends through the molded case of the circuit breaker. After a trip operation, the reset button can be depressed to rees- tablish physical engagement between the first and se- cond plungers, enabling the circuit breaker to be re- set.

471664

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