Starting control circuit of low-voltage high-power motor

The utility model provides a start control circuit of a low-voltage high-power motor, and belongs to the technical field of soft start control circuits. The problems of low-voltage high-power motor soft start, high fault rate of ancillary facilities, inconvenience in fault checking and the like are solved; comprising a main loop and a control loop, a three-phase power supply wire inlet end on the main loop is connected to a soft starter after passing through a main circuit breaker, and terminals U1, V1 and W1 in the soft starter are connected in parallel with terminals U, V and W in the soft starter and a three-phase power supply end of a low-voltage high-power motor through a bypass contactor KM1; a starting terminal of the soft starter is connected with a normally open contact of the intermediate relay KA3; the control loop comprises a power supply loop, an instrument control intertripping/starting button loop, a contactor state control loop, a circuit breaker state control loop, a stop button loop, a power