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The high-voltage disconnector ensures the safety of high-voltage electrical appliances and devices during maintenance and plays the role of isolation voltage. It can not be used to cut off and input load current and short-circuit current. It can only be used for some switching operations that do not produce strong arc, that is to say, it does not have arc extinguishing function; It can be divided into indoor type and outdoor type according to the installation location. It can be divided into single column type, double column type and three column type according to the number of insulating pillars. Optional equipment is available for each voltage level. In addition, the parts of the high-voltage distribution device that need power failure can be reliably isolated from the live parts to ensure the safety of maintenance work. All contacts of the high-voltage disconnector are exposed in the air and have obvious breaking points. The disconnector has no arc extinguishing device, so it cannot be used to cut off the load current or short-circuit current. Otherwise, under the action of high voltage, the breaking point will produce strong arc and it is difficult to extinguish by itself, which may even cause arcing (phase to ground or phase to phase short circuit), burn the equipment and endanger personal safety, This is the so-called serious accident of "pulling disconnector with load".

High voltage disconnector can also be used to switch some circuits to change the operation mode of the system. For example, in a double bus circuit, a high-voltage disconnector can be used to switch the running circuit from one bus to another.