The utility model relates to a power supply auxiliary assembly technical field, specific anti -electricity -theft and alarm device supplies power that says so, its characterized in that is equipped with the controller, a memory, power supply circuit, radio communication circuit, the display circuit, the display, warning circuit, audible -visual annunciator, the zero line detection circuitry that opens circuit, current sampling circuit, the supply control circuit, wherein the controller respectively with the memory, power supply circuit, radio communication circuit, the display circuit, warning circuit, current sampling circuit, the supply control circuit is connected, the output of display circuit is connected with the display, warning circuit's output is connected with audible -visual annunciator, the output that the zero line opens circuit detection circuitry is connected with current sampling circuit, the zero line opens circuit detection circuitry including the zero line inlet wire end that inserts the ammeter and the detection line of zero line leading -out terminal, detection line while ground connection, be equipped with current transformer among the current sampling circuit, compared with the prior art, the utility model, has the advantage that is showing that waits rational in infrastructure.