The QLG series ring main unit is an SF6 gas-insulated metal-clad switchgear independently developed and produced by our company. This equipment uses SF6 gas as both the insulating and arc-quenching medium. The load switch, vacuum circuit breaker, and live busbar are all sealed within a closed stainless steel container pressurized with SF6 gas. Externally, it adopts American or European standard bushings to connect to incoming and outgoing cables via cable joints, forming a fully insulated, fully enclosed structure that effectively resists flooding and is resistant to contamination, making it suitable for various harsh environments. It is widely used in 12kV ring networks or terminal power supply systems.