Features: provided with three working positions including connected, isolated and grounded; meet the following requirements: GB3804 and GB1985; 3 position switchgear consists of load switch and fast grounding switch; the switch axle is connected with the mechanism axle through the movable fit of magnetic fluid in front of the gas box of the switch cabinet; in the breaking process of load current, there is a special airway to carry out “blowing arc extinction” for arc, to ensure safe and reliable breaking performance; the insulation partitions are used between phases to avoid the short circuit between phases; the switch is placed in a stable environment filled with SF6 gas, to meet the GB / T11022 standard maintenance-free requirements.