Long-term over-current, frequent start-up, under-voltage, and phase-failure of the motor can cause over-current. The thermal relay is an overcurrent relay with overload protection characteristics. It is a protective device that uses the thermal effect of current to cut off the circuit. It is used in the control circuit as an overload protection and phase-failure protection of the motor, which can not only ensure that the motor does not exceed the allowable overload, but also can ensure the maximum overload capacity of the motor. Of course, we must first ensure the normal operation of the motor.
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