3 Phases Electric Isolator Switch for Switchgear 112kV,1000-4000A, 50Hz,3 phases 2.. L/C,T/T 3.Various Types 12kV 3 Phases Electric Isolator Switch for Switchgear 1. Features of Main Structure1.1 Type GN30-12Q/1000, 1250, 1600, 2000, 2500, 3150 or 4000 isolating switch is a new type rotary isolating switch. The main body of the isolating switch is fixed at two sides of a bottom frame by two ...