Silicone Rubber Insulator Turn Arm as insulation gasket and insulation sleeve isolation arm are insulating materials, the arm and ground contact are reliably insulated from each other. The insulation structure is only simple insulation flat gasket and coaxial insulation bushing, not only very convenient processing, simple installation, can greatly save the purchase cost, improve assembly efficiency, at the same time, there is no insulation arm fracture risk, high reliability.