The isolating switch is a switching device without arc extinguishing function. When in position, there is an insulation distance and an obvious disconnection mark between the contacts that meet the specified requirements; when in the closed position, it can carry the current under normal circuit conditions and The current under abnormal conditions (such as short circuit) within the specified time. It is usually used as a high-voltage isolation switch, that is, an isolation switch with a rated voltage above 1kV.

The main functions of the isolating switch include:

Circuit isolation: In the maintenance of electrical equipment, to provide an electrical interval, and is a visible disconnect point, to ensure the personal safety of maintenance personnel.

Circuit switching: In a double bus circuit, an isolating switch can be used to switch the running circuit from one bus to another.

Operation of small current circuit: isolation switch can also be used to operate some small current circuit.