SF6 Insulated Switchgear ring main unit maintenance -free,compact and independent of altitude,dewdrop,contaminant, chemical Technical characteristicsThe main technical characteristicsItemUnitC ... /Earthing switchtime 50002000 50002000 100002000Resistance of the main circuitμΩ≤120-≤120Pressure of compressed gasRated pressure ... .05≤0.05≤0.05 24kV, RMU, Switchgear, GIS, SF6 Ring Main Unit, 110408