Protector for electric motor

The utility model relates to a protector for the electric motor. The utility model is characterized in that the surface of the exposed winding of the terminal of a motor, the terminal of an iron core slot, and a bamboo cleat on the slot are coated with a protective layer with synthetic resin emulsion paint. A wave detecting and setting circuit connected with each mutual inductor of the motor is arranged in the circuit of the protector. The output terminal of the wave detecting and setting circuit is connected with a phase failure and a three-phase unbalance memory protection circuits. The protection circuits are connected with an executive circuit. The utility model has effective protection, when the motor has the abnormal situations of the overloading, the locked rotating, the phase failure, the three-phase unbalance, etc., and has the functions of fault memory indication and alarm, improving the service life more than 15 to 20 years.