SOLENOID OPERATOR CIRCUIT FOR MOLDED CASE CIRCUIT BREAKER

The invention relates to a control circuit for controlling the energization of a handle operator/adapted for use with a circuit breaker to effect movement of the circuit breaker handle from one position thereof to another. … The control circuit employs a monostable multivibrator including a normally non-conducting switch (426) which, upon initial closure of a contact switch (422), is rendered conducting to supply an energizing pulse to an operating solenoid (424) of the handle operator, and including timing means (442-448) for rendering the switch (426) nonconducting again after a predetermined time interval sufficient for the handle operator to complete movement of the circuit breaker handle (42). The timing means automatically increases said time interval in proportion to any drop in the energizing voltage sensed.