GW4 Outdoor AC high voltage isolation switch is a two-column three-phase AC 50Hz outdoor high voltage switchgear for power system voltage 10-220kV, the supply voltage at no load for hours together circuits, as well as being on the high voltage bus overhaul , circuit breakers and other electrical equipment and charged high voltage lines for circuit isolation. Pollution prevention isolating switch which can meet the requirements of users in the region re-contamination, and can effectively address the isolation switch in the operation of the flashover problem.

Isolation switch is open double-column horizontal type, the composition of each single stage by the dock, post insulators, outlet and contact other parts of the seat, the two pillars of the insulating porcelain mounted parallel to each other on both ends of the bearing base, and the base vertical . Leading electrical part were installed in the two pillars above the porcelain insulator, porcelain insulator with pillars do 90°rotation.