Trc-12 series fully insulated and fully closed loop network switch equipment is SF6 gas-insulated metal common box type closed switch equipment. The equipment can be composed of load switch unit, load switch fuse combination unit, vacuum circuit breaker unit, bus feeder unit and other modules. Adopt a series of advanced technology and material. With excellent electrical and mechanical properties, the environment and climate influence is small, small size, easy to install, easy to operate, no maintenance, and has a flexible combination. Clear and intuitive design ensures simple and direct operation. Feeder wiring capacity is large, suitable for various wiring systems.