1.GN27 40.5 indoor hv isolating switch 2.three-phase ac 50 Hz ac voltage switch equipment 3.used for 35 kV ... .5 series high voltage indoor disconnect switch is three-phase ac 50 Hz ac voltage switch equipment, used for 10 ~ 110 KV ... current A 1250,1600,2000,2500,3150 3 Rated short-time withstand current kA 31.5/4s,40/4s 4 Rated ... isolation in the lines. GN27-40.5 Indoor High Voltage Switch Disconnector