Harbin HongYing Company located in Harbin, Heilongjiang of China. VCM-12 series solid sealed high-voltage vacuum circuit breaker is a small type of vacuum circuit breaker. The mature APG technology is used to solid sealed vacuum arc-extinguish chamber and main circuit in the insulating cylinder for completely solving the voltage dropping of insulating parts influenced by circumstance, so as to ensure the application of vacuum arc-extinguish chamber suitable for rather poor conditions. This kind of breaker is of new type spring operating mechanism with the features of reliable stability, simple operation, high ratio of input moment and high mechanism efficiency.