The circuit diagram shared in this paper shows the wiring diagram of the motor forward and reverse control, and it is a double interlock with the button plus contactor to assist the electric shock. With the self-holding control mode, the control loop voltage is the line voltage. In principle, there is no problem, and basic functions can be realized. However, the normally closed contact of the thermal relay is generally connected between the contactor coil and the power supply "2". The purpose of this is to disconnect the normally closed contact after the thermal relay is activated. At this time, the entire control circuit except one end of the SB1 (" 1") and one end of the normally closed contact of the thermal relay ("2") is energized, the other components are not charged, especially the coil of the contactor is uncharged, which effectively reduces the risk of electric shock due to inspection action. It can also completely cut off the coil. Because the thermal relay action is usually caused by the main circuit current being too long, so that the bimetal temperature in the relay reaches the action value and then protects the action and cuts off the main circuit to protect the motor and the contactor. 
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