Indoor AC high-voltage gas-insulated metal-enclosed switchgear (hereinafter referred to as "inflatable counter") is a new generation of switching equipment, the main switch can be used both permanent magnetic actuator vacuum circuit breaker can also use a vacuum circuit breaker spring mechanism, the entire cabinet with air insulation and sulfur hexafluoride gas compartment combination of both compact and can be expanded to apply to distribution automation. Inflatable cabinet with compact structure, flexible operation, reliable interlocking characteristics of a variety of different applications (especially harsh environments place), different user requirements can provide a satisfactory technical solution. Latest sensor technology and the use of protective relays, coupled with advanced technical performance and lightweight flexible assembly program, fully meet the needs of different users. Inflatable cabinet for a small secondary substation power system, opening and closing, box-type substation, residential areas, industrial and mining enterprises, shopping malls, especially for electricity requires high airport, subway, railway and so on. RMU (Ring Main Unit) is a group of high-voltage switchgear mounted on metal or non-metallic insulation made of assembled cabinet or interval-type ring network power supply unit of the electrical equipment, the core part of the load switch and fuse, a simple structure , small size, low price, can improve power supply parameters and performance, and security of electricity supply and so on. It is widely used in power distribution stations and box-type substation in urban residential area, high-rise buildings, large public buildings, factories and enterprises and other load centers. It works high voltage switches and circuit breakers similar. General interrupter device equipped with a simple, but its structure is relatively simple. The picture shows a puffer type high-voltage load switch, their work is: When opening, in opening action of the spring, the spindle is rotated clockwise, on the one hand by the slider-crank mechanism so that the piston moves upward, the gas compression; another Transmission system via two four-bar linkage consisting of the main knife to open, and then push the knife so that the arc interrupter contacts open, the cylinder of compressed air to blow out the arc through the nozzle. Closing, through the spindle and drive system, the main knife and arc knife while turning it clockwise first arc contact closure; spindle continues to rotate