Patent ID: 8354589

Claim:
A power cable comprising: an input terminal configured for connecting to a power source, at least one output terminal configured for connecting to at least one electrical device, a switch connected between the input terminal and the at least one output terminal via a power transmitting wire, a voltage comparing device connected to the switch, a voltage setting device connected to the voltage comparing device, the voltage setting device comprising: a first jumper comprising two conductive sheets, a second jumper comprising another two conductive sheets, and a jumper cap configured for selectively and electrically bridging the two conductive sheets of the first jumper or the two conductive sheets of the second jumper, a voltage sampling device connected between the input terminal and the voltage comparing device and configured for sampling a voltage of the power source, the voltage comparing device configured for comparing a preset voltage stored in the voltage setting device and the sampled voltage sensed by the voltage sampling device, to turn on or turn off the switch according to the compared result between the preset voltage and the sampled voltage, and a power supply connected with the input terminal and the voltage comparing device and configured for reducing the voltage of the power source to a rated voltage for the voltage comparing device to power the voltage comparing device.