GW1-12 Outdoor AC HV voltage disconnect switch (disconnect switch for short) is used to open and close circuit with voltage but no-load 50HZ 12(40.5)kV power system. It accords with standard: IEC129-1984 AC Disconnect Switch and Earthing Switch. There are with earthing and without earthing two types, for earthing type, it can be matched with CSJ type manual mechanism to avoid error, there is no necessary to hang an earthing line. There are normal and anti-pollution two types, the anti-pollution type used in serious pollution area.