Open-phase protection switch with overheating detection function

The open-phase protection switch comprises a connecting device, a temperature measuring device and a transformer pile head, the connecting device comprises three sets of fixing mechanisms which are transversely arranged at equal intervals, one side between every two adjacent fixing mechanisms is provided with a connecting mechanism, and the other side between every two adjacent fixing mechanisms is provided with a temperature measuring device. A pop-up mechanism is arranged on one side of the connecting mechanism, a telescopic mechanism is arranged on the other side, located on the connecting mechanism, of the fixing mechanism, a telescopic column is arranged on one side of the telescopic mechanism, a locking mechanism is arranged at the outer end of the telescopic fixing mechanism located at the outer end, the temperature measuring device comprises a temperature measuring head, and one end of the temperature measuring head is fixedly connected with a third spring. The bottom of the transformer pile head is e