Switchgear HB-12 Environmental Gas-Insulated Ring Main Unit "HB-12 Environmental Gas-Insulated Ring Main Unit" is an innovative and environmentally friendly metal-enclosed switchgear. It utilizes eco-friendly gases such as dry air or nitrogen for insulation, resulting in minimal or no greenhouse gas emissions. With a material recyclability rate exceeding 90% after the product's lifecycle, it minimizes environmental impact. The insulation components, except for the casing, primarily avoid the use of epoxy resin materials that are difficult to degrade, truly achieving green and sustainable objectives. Both the circuit breaker and load switch in this unit employ vacuum arc extinction technology, offering strong environmental adaptability, compact size, space-saving design, no need for SF6 gas detection and protection, reliable and safe operation, maintenance-free features, and intelligent capabilities. It represents the future direction of development for ring main units.It is designed for use in a 12kV, three-phase AC, 50Hz system with a single busbar or segmented busbar configuration. It serves as a complete distribution device for industrial and civil cable ring networks and distribution terminal projects. The unit is employed for the reception and distribution of electrical energy in urban residential distribution, small-scale secondary substations, switching stations, cable branch boxes, compact substations, industrial and mining enterprises, shopping malls, airports, subways, wind power generation, hospitals, sports stadiums, railways, tunnels, and other locations.