The primary components are fully enclosed within an aluminum alloy housing, with built-in isolating switches, circuit breakers, current transformers, voltage sensors, operating mechanisms, etc., significantly reducing the installation space of the product and making on-site installation and maintenance easier. The use of a rotating arc chamber combined with environmentally friendly gas for comprehensive vacuum arc extinction is more environmentally friendly, with better insulation and arc extinction performance, and the operation is not affected by environmental factors, improving arc extinction efficiency and electrical life. The product housing is made of aluminum alloy die-casting, with a one-piece molding, lighter weight, and better sealing effect.