Single -fire wire switch

The utility model discloses a single -fire wire switch is suitable for the connection between live wire and load, include: the input of being connected with the live wire inlet wire, the output of being connected with the load, electric unit is got in the circular telegram of connection between input and output, and including main switch circuit, trigger circuit with get the circuit, main switch circuit is suitable for the break -make according to the on -off control load of main switch, and trigger circuit is suitable for the break -make that triggers the main switch, gets the circuit and is suitable for the power supply to battery management unit and the control unit according to main switch circuit and trigger circuit's on -off control, get the battery management unit of electric unit connection with the circular telegram, including battery measurement circuit and group battery, the battery measurement circuit is suitable for and charges to the group battery when getting the circuit and supply power to it,