THG solid insulated ring main unit integrates three core technologies: external solid sealing, insulated busbar, and modular unit miniaturization, and belongs to the new generation of environmentally friendly distribution equipment. The product operates without toxic substance emissions, and there are no safety hazards such as gas leaks, explosions, or internal arcing. It has outstanding advantages such as excellent insulation performance, high overall structural strength, and maintenance free. It can be applied to scenarios such as radial, mainline, ring network power supply switching stations, and terminal distribution stations, and is the preferred solution for power distribution projects in urban commercial areas and residential communities.