GIS-40.5 series gas-insulated metal-enclosed switchgear (C-GIS) is a new generation of gas-insulated switchgear C-GIS products developed by our company. Metal armor gas seal, low-pressure SF6 gas is used as the insulating medium inside, high-voltage components are waterproof and dustproof, not affected by the environment and altitude, completely maintenance-free, using permanent magnet or spring operating mechanism, solid-sealed pole vacuum interrupter, and greatly reduced parts. It can operate reliably in harsh environments such as basements, plateaus, frozen soil, and coastal areas with high altitudes, humidity, and salt spray, meeting the needs of new energy, plateaus, subways, high-speed railways, and urban power distribution projects with tight land use. It has the characteristics of high reliability, maintenance-free, strong adaptability, and small footprint. It adopts intelligent control and protection units, has powerful control, protection, measurement, and communication functions, and fully realizes the requirements of distribution network automation. This product is mainly used in power distribution systems such as power plants, small and medium-sized power stations, substations, high-rise buildings, industrial and mining enterprises, subways, and electrified railways to control, accept, distribute, protect, and monitor power supply systems and electric energy.