Circuit breaker

Details Circuit breaker Circuit breaker

H - Electricity

01

H

H01H 71/24 (2006.01) H01H 71/74 (2006.01)

Patent

CA 2153755

A circuit breaker having electrical contacts operable between a closed position in which a circuit is completed through the conductor and an open position in which the circuit through the conductor is interrupted. The circuit breaker includes a latchable operating mechanism operable to open the electrical contacts when unlatched and a trip bar rotatable from a biased position to a trip position to unlatch the operating mechanism. A magnetic trip assembly is provided including a frame, a stationary magnetic structure mounted to the frame and a movable armature which is attracted to the stationary magnetic structure by abnormal current through the conductor to rotate the trip bar to a trip position. The movable armature includes a nib extending angularly therefrom, the nib defining a detent. The armature is pivotably mounted to the stationary magnetic frame by a pin. A spring biased plunger supported by the frame engages into the detent to bias the armature away from the stationary magnetic structure to form a gap therebetween. The plunger disengages from the detent when the armature is attracted to the stationary magnetic structure by the abnormal current through the conductor to allow the movable armature to rotate about the pin and trip the trip bar to interrupt the circuit.

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