Overheating protection circuit and power supply change-over device employing same

The utility model discloses an overheating protection circuit and a power supply change-over device employing the overheating protection circuit. The overheating protection circuit comprises a thermo-sensing assembly, a switch and a control unit, wherein the thermo-sensing assembly senses the temperature of a power cord, the switch is connected with the power cord, and the control unit controls the switch to disconnect a power supply when the temperature of the power cord is higher than a default value. The overheating protection circuit and the power supply change-over device employing the overheating protection circuit can realize timely disconnection of the power supply in case of an excessively high temperature of the power cord, so as to prevent sparkling and remind users of real-time and corresponding handling.