Why Are High-voltage Disconnect Switches Not Equipped With Dedicated Arc-extinguishing Devices?

High Voltage Disconnect Switch (Knife Switch) is mainly responsible for disconnecting circuits that are de-energized or unloaded, so as to facilitate subsequent inspection or maintenance. Compared with circuit breakers or load switches with arc extinguishing devices, disconnect switches have a simpler structure, with contacts exposed to the air and a clearly visible isolation point. Because they are mainly used in no-load or extremely low current conditions, the generation, propagation, and extinguishing of arcs during traditional current interruption processes are not the primary considerations.