Operating Mechanism for Motor protector (3056029)

1. When a large current passes through the coil, according to the principle of electromagnetic induction, a strong magnetic field is generated around the coil, the iron core is magnetized, and a strong attraction is generated to the armature; when the electromagnetic force exceeds the tension of the reset spring, the armature moves rapidly toward the iron core to eliminate the gap between the two; the movement of the armature is transmitted to the contact system of the protector through the mechanical lever, so that the main circuit contact (such as the contactor or circuit breaker contact) is forced to disconnect within milliseconds, cutting off the power supply to the motor.
2. When the overload current passes through the heating element, the heat generated accumulates over time (the greater the overload current, the faster the heat is generated), causing the temperature of the bimetallic strip to continue to rise; due to the different thermal expansion coefficients of the two metals, after the temperature rises, the side with a larger expansion coefficient will bend toward the side with a smaller expansion coefficient, resulting in obvious mechanical deformation; when the deformation of the bimetallic strip reaches the threshold, it will push the mechanical linkage mechanism to quickly separate the moving and static contacts of the protector, cut off the power supply to the motor, and prevent the motor winding from burning due to long-term overheating (exceeding the insulation tolerance temperature).