How to wire the pump coil overheating protector?
The overheating protection device of the water pump motor is usually a thermal relay, the thermal element of the thermal relay is buried in the three-phase water pump motor coil, when the coil is overheated, the thermal relay will open the contact, the contact is connected in series to the circuit of the contactor coil; When the motor is overloaded, the coil overheats, the thermal relay will open the contacts, the contactor coil is de-energized, and the motor is disconnected from the power supply. In general, the upper port of the thermal relay is connected to the lower port of the contactor, and the lower port is connected to the motor, and the protection current can be set. The overheating protection device on the three-phase asynchronous motor is generally --- thermal relay; But its thermal element is directly buried in the coil of the motor, and when the coil overheats, the thermal relay acts and opens the contacts, so it is enough to connect its contacts in series in the circuit of the contactor coil. When the motor is overloaded, the coil overheats, the thermal relay acts, the contacts open, and the contactor coil is de-energized, disconnecting the motor from the power supply. The auxiliary normally closed point string of the overheating protector is connected to the coil loop of the AC contactor
