First of all, the current flowing into the heat element appears heat, and then the metal sheet with different expansion coefficients will appear deformed, and when the deformation reaches the preset distance, it will push the connecting rod, disconnect the control circuit, and then cause the contactor to lose power, so that the main circuit is disconnected, and realize the overload protection of the motor.
Thermal overload relay can be switched on and off no-load and load current; When the system fails, it can cooperate well with the protection and automatic device, and can quickly cut off the fault current, prevent accidents, and ensure the normal operation of the system.