Why Are The Withstand Voltage Requirements For Vertical Fuse Disconnect Switches So Stringent?

As a critical component in a power system that must be disconnected from energized systems and isolated from subsequent facilities, the contacts of the vertical fuse switch disconnector circuit must still withstand transient voltage surges from the system and the environment after disconnection. Since the nhrt40 vertical fuse switch disconnector circuit is mostly vertically arranged, once disconnected, the contacts and their supporting insulation structure will be exposed to potential overvoltage, arcing, and even flashover risks.