The C-GIS inflatable cabinet three position vacuum circuit breaker is an intelligent switchgear designed specifically for 12kV, 24kV, and 40.5kV power systems, integrating control, protection, and isolation functions. It is particularly suitable for harsh scenarios that require frequent operation and high short-circuit current breaking. Adopting inflatable cabinets (SF ?/N ? insulation) and vacuum arc extinguishing technology, it is suitable for the distribution needs of industrial and mining enterprises, power plants, and substations, in compliance with GB/T1984-2014, JB/T3855-2008, and DL/T403-2000 standards, with a mechanical life of over 20000 times and a breaking capacity of up to 40kA. The integrated structure of the three in one design (closing opening grounding) and the mechanism circuit breaker enables fast maintenance and compact installation, with a protection level of IP67 and a tolerance for extreme environments ranging from -40 ° C to+70 ° C.