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 a 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 outward 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 and 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 press 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 interlocking with a main switching shaft of the circuit breaker subsequent to a trip operation;
• 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 even when the plunger is moved to the retracted position by the automatic reset mechanism so as to allow the micro switch to maintain a trip indicating state subsequent to a trip operation, and a release position for allowing the switch driving lever mechanism to rotate to the first position, and provided adjacent to the switch driving lever mechanism;
• and
• an avoiding portion that is formed on the output plate to avoid contacting with the switch driving lever mechanism for a mutually independent operation between the switch driving lever mechanism and the output plate.