Current Breaking Characteristics Of High Voltage Disconnect Switches

hv isolator switch can only operate when there is no current in the circuit, which means that it does not have the ability to interrupt current, especially it cannot interrupt fault current. The high voltage electrical isolator circuit breaker does not have an arc-extinguishing device in its structure. When it is disconnected under energized load or short circuit conditions, it will generate a continuous electric arc, causing equipment damage and potential safety hazards. Therefore, it must be used in conjunction with circuit breakers or other disconnecting devices.

Although the isolator high voltage does not directly bear the task of breaking the load current, its mechanical structure and insulation configuration must meet the requirements of stable isolation under high voltage environment. During design and selection, engineers choose suitable products based on voltage level, installation location, and operating method to ensure reliable physical isolation distance and contact status indication in the current-free state.