The high-voltage live parts are cast in epoxy resin material, integrating the vacuum interrupter chamber and other components into a single unit. They are connected through fully insulated solid busbars. It has the advantages of full insulation, full sealing, and maintenance-free. It is not affected by external environmental conditions and is suitable for harsh environments such as high altitudes, high temperatures, and high humidity. The main switch and disconnect switch can be operated electrically, meeting the requirements of remote control, remote measurement, and remote signaling in the smart grid.