This product absorbs the advanced technology from abroad, and is designed and developed by itself in view of the high accident rate and bulky volume of the existing air-insulated switchgear of the same type in China. It has the advantages of small cabinet volume (only 50% of the volume of ordinary switch cabinet), good circuit breaker performance, high reliability, and reliable and simple "five prevention" interlocking mechanism. As a power plant, substation and industrial and mining enterprises to receive and distribute electric energy, it can control, protect and detect circuits, and can also be used in places with frequent