... requirement. HXGN15-12 Metalclad Ring-Main Switchgear(Ring main unit, RMU)is suitable for use in AC 50/60Hz12kV ... suriable the following applications: power distribution forurbanresidentialareas,smallsecondarytransformerstations,switchingstations,factories/mines,shopping malls,airports,subways,wind power generation,hosptials,sports arenas,railways ... such as GB3906 and IEC298. SM66 Ring main unit