Rolating actuator for circuit breakers suited for in advance actuation of an undervoltage tripping unit

摘要

Rotating actuator of a molded case circuit breaker comprising a disk (14), moved by a shaft (12) of a rotating knob, which is provided with a slot (16), bounded by a protruding cam (18) actuating a lever (48) engaged in a slot (54) of a slider (56) having the duty of actuating the contacts of a auxiliary contact unit (60) of the circuit breaker to the purpose of feeding an undervoltage tripping unit thereof before the beginning of a closing operation of the circuit breaker and of preventing an unwanted tripping of the circuit breaker due to lack of voltage on the same undervoltage tripping unit. <IMAGE>