The protection characteristics of the thermal relay are close to the overload characteristics of the motor in order to give full play to the overload capability of the motor.
When using a thermal relay to protect the motor from overload, connect the thermal element to the stator winding of the motor, connect the normally closed contact of the thermal relay in series with the control circuit of the electromagnetic coil of the AC contactor, and adjust the setting current adjustment knob to make the person The font lever is at an appropriate distance from the push rod. When the motor works normally, the current passing through the heat element is the rated current of the motor, the heat element heats up, and the bimetal is bent after being heated, so that the push rod just touches the herringbone lever, and cannot push the chevron lever. The normally closed contact is in a closed state, the AC contactor remains closed, and the motor operates normally. If the motor is overloaded, the current in the winding increases, the current in the thermal relay element increases, the temperature of the bimetal rises higher, the bending degree increases, the herringbone lever is pushed, and the herringbone lever pushes the normally closed contact. The contact is disconnected and the AC contactor coil circuit is disconnected, the contactor is released, the power of the motor is cut off, and the motor is stopped to be protected.
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