High-voltage circuit breaker (or high-voltage switch) can cut off or close the no-load current and load current in the high-voltage circuit, and cut off the overload current and short-circuit current through the action of the relay protection device when the system fails. Perfect arc-extinguishing structure and sufficient current-breaking capability can be divided into: oil circuit breaker (multi-oil circuit breaker, oil-less circuit breaker), sulfur hexafluoride circuit breaker (SF6 circuit breaker), vacuum circuit breaker, compressed air circuit breaker And so on. Ningbo Royalux Lighting Co., Ltd. , https://www.royaluxlite.com