1) The isolation switch adopts double-column mid-open and contact in-turn structure, which has the ability of self-cleaning contact and improves the contact reliability;

2) The rotating part of the isolation switch is designed according to the requirement of maintenance free. Rotary seat is designed to seal structure, water vapor, dust, harmful gas can not enter, so that the bearing, lithium base key disulfide lithium base grease always work in a good environment, bearing never rust stream grease can not be lost, never dry solid, so that the operating moment of the isolation switch will not increase after long-term operation. Stainless steel shaft pin and oil-free self-lubricating bearing are used to match the structure. The steel parts adopt hot dip galvanizing to ensure the isolation switch operation is flexible, light, reliable and never corrode.