Make-and-break mechanism for circuit breaker

Abstract

In a make-and-break mechanism for use in a circuit breaker, an alarm output plate,, which is disposed so as to be slidable in the vertical direction along the frame (cover plate),of the make-and-break mechanism, is secured to the engaging projection,of the cover plate,through a pair of right and left guide holes,formed therein. At the same time, one end of a handle spring,, which, in the trip operation, is used to rotate an operation handle,to a trip display position, is caught on the alarm output plate,. In case where a latch receiver,is driven or rotated by the overcurrent detect portion of the make-and-break mechanism and the secured condition of a latch is thereby removed, the electric circuit of the circuit breaker is broken due to the stored energy of a main spring,and, in this case, the alarm output plate,is driven or slided in the lateral direction and thus the secured condition of the alarm output plate,is removed, so that the alarm output plate,is driven in the upward direction due to the spring force of the handle spring,to thereby operate an alarm contact.