Motor temperature protection device

The utility model specifically relates to a motor temperature protection device. A fuse 1RD, a start button SA, a stop button SB, a relay KM, normally-closed temperature control switch KSD1, a normally-closed temperature control switch KSD2, a normally-closed temperature control switch KSD3 and a fuse 2RD are serially connected successively between the U phase and the W phase of a three-phase power source, wherein the stop button SA is connected in parallel with a normally open contact KM2 of the relay KM; the normally-closed temperature control switch KSD1 is installed on the U-phase stator coil of a three-phase motor, the normally-closed temperature control switch KSD2 is installed on the V-phase stator coil of the three-phase motor, the normally-closed temperature control switch KSD3 is installed on the W-phase stator coil of the three-phase motor; and a normally open contact KM1 of the relay KM is arranged on the power line of the three-phase motor and serially connected with a plastic switch ZK. The moto