Thermal relay connecting circuit in starlike-triangular starting circuit of motor

The utility model discloses a thermal relay connecting circuit in a starlike-triangular starting circuit of a motor, which comprises an alternating-current contactor (KM1), a thermal relay (FR), a motor coil (L1), a triangular contactor (KM2) and a starlike contactor (KM3), wherein the thermal relay (FR) is connected in the circuit between the alternating-current contactor (KM1) and the motor coil (L1) in series, and the main contact of the triangular contactor (KM2) is connected on the circuit between the thermal relay (FR) and the motor coil (L1) in parallel. For the connecting circuit, the current flowing through the thermal relay is 1/1.732 time of that of the traditional circuit, therefore, the ampere rating of the thermal relay is smaller than that of the thermal relay of the traditional circuit, which can shrink the volume of a power control box body and reduce the sectional area of a cable.