Magnetic trip device for circuit breaker

A magnetic trip device for a circuit breaker, comprising:

• an actuator coil part that has a plunger configured to move to an advanced position or a retracted position according to the magnetization or demagnetization of a coil;
• an output plate that is rotatably provided on the movement path of the plunger to rotate in a first direction by the pressing of the plunger;
• a micro switch that has an operation lever portion protruding outwardly and is configured to output an electrical signal indicating a state of the circuit breaker according to whether or not the operation lever portion is pressed;
• a switch driving lever mechanism that is configured to rotate to a first position for pressing the operation lever portion or a second position for releasing the operation lever portion so as to open or close the micro switch;
• a driving lever bias spring that is provided at a predetermined position to elastically bias the switch driving lever mechanism to rotate to the second position;
• an automatic reset mechanism that is configured to press the plunger of the actuator coil part to the retracted position in connection with a main switching shaft of the circuit breaker subsequent to a trip operation;
• and
• a driving lever latch that is configured to rotate to a restraining position for preventing the switch driving lever mechanism from rotating to the first position so as to allow the micro switch to maintain a trip indicating state subsequent to a trip operation even when the plunger is moved to the retracted position by the automatic reset mechanism, and a release position for allowing the switch driving lever mechanism to rotate to the first position, and the driving lever latch is provided adjacent to the switch driving lever mechanism.