Abstract: A automatic unlock device for tourniquet, includes a lock structure for setting the tourniquet in tight state, an unlock device for unlocking the lock structure and setting the tourniquet in loose state, and a control circuit for controlling the unlock device. The unlock device is connected with the lock structure, the drive part of the unlock device is connected with the control circuit, and the drive part drives the unlock device to lock or loose the lock structure. When in use, the lock structure is buckled with the unlock device to reduce the length of the tourniquet, that is, in tight state. Simultaneously, the control circuit can be manually or automatically set the unlocking time and start timing. When the time is up, the control circuit outputs a control signal to the drive part to drive the unlock device releasing the lock structure.

Abstract: A thermal protection plug, provides a temperature sensor I, which is directly contact with the neutral wire terminal, so as the heat transferring from neutral wire terminal to the temperature sensor keeps prompt and improve the response delay to cut-off the power switch. And because the negative pole of DC is collinear with the neutral wire terminal, it means that the temperature sensor I can use a low voltage isolation sensor and it is safer even though the breakdown between the shell and the pins of the temperature sensor I.