Voltage Switchgear is a key device in the power system, characterized by its high reliability, compactness, intelligence and safety. Its materials include high-strength metal casing, SF6 gas or solid insulation material and copper conductive parts. Its advantages are efficient protection, space saving, low maintenance cost and strong adaptability. It is widely used in industry, commercial buildings, infrastructure and energy fields, and is an indispensable and important equipment in modern power systems.