HXGN10-40.5 (F) (F R)/630-20 50-31.5 indoor HV SF6 switchgear (hereinafter shorted as RMU) is a 50Hz AC three-phase indoor HV power distribution equipment. It is a combination electrical apparatus with load switch and ground connection switch and the bus of his return circuit seal up in the metal case aspect, adopting spring conduce motive construct, with SF6 gas regards to arc and insulation dielectric. It is suitable in 40.5kV ring supply of power supply circuit or double radiation power supplies, and can change the one radiation power supply method originally. It can recover transformer return circuit.Fed promptly when the circuit breaks down, it has raised the reliability and utilization ratio. Especially, it is suitable in power supply with great load density and the industry business zone or rural area villages and towns of cable feed network. At the same time, RUM is safe in use, easy to install and saves place for loading in box type substation. Load switch or the load switch- fuse combinations in RMU also can be used as complete switchgear by self.