In order to improve the reliability of power supply, users can obtain power from two directions, usually connecting the power supply network into a ring. This power supply mode is referred to as ring network power supply. The high voltage switchgear is commonly used as the ring network cabinet. Ring network cabinet is a group of high-voltage switchgear installed in the steel plate metal cabinet or made into a spaced ring network power supply unit of electrical equipment, its core components consist of load switches, fuses. The utility model has the advantages of simple structure, small volume, low price, improved power supply parameters and performance, and power supply safety, etc. It is widely used in urban residential areas, high-rise buildings, large-scale public buildings, factories and other load center distribution stations and box substations.