The high-voltage load switch has a dual identity, because its function can be both a high-voltage circuit breaker and a high-voltage isolating switch, and it is an electrical appliance in between.

Although it has a simple arc extinguishing device, it can also switch on and off a certain load current and over-negative current, but it cannot disconnect the short-circuit current, so it is generally used in series with a high-voltage fuse, and the fuse is used for short-circuit protection.

It is a product that integrates the advantages of large breaking capacity, safety and reliability, long electrical life, frequent operation, compact structure, small size, light weight, and basically does not require maintenance, but its environmental conditions have certain restrictions. First, it uses an altitude of 2000m and below, ambient temperature: -25℃~+40℃, relative humidity: daily average value is not more than 95%, monthly average value is not more than 90%, and secondly, it should be placed in non-conductive dust, Places with corrosive gas and water vapor, and places without fire and explosion hazards. Finally, it cannot have severe vibrations, and it cannot be placed in places with severe vibrations.

In addition, it has some features:

A. The power supply can be isolated, with obvious disconnection points, and it is mostly used for fixed high-voltage equipment.

B. It has an arc extinguishing device and a certain opening and closing speed, and can pass through the normal working current and the specified short circuit in the closed state.

C. It is strictly forbidden to connect and disconnect the circuit with load, and it is often used in series with high-voltage fuses. (The function is close to that of a high-voltage circuit breaker, which can simplify power distribution devices and relay protection, and reduce equipment costs)