3AE-SION vacuum circuit breaker is the latest generation of products developed and produced by Siemens in combination with 30 years of vacuum product design and operation experience and for the Chinese power market. It integrates the latest German technology and represents the latest development direction of vacuum switches. The circuit breaker adopts large creepage insulation design and is equipped with the latest developed large creepage vacuum arc chamber, which is more suitable for the technical standards and full insulation operating conditions of China's power system.