VS1 series HV vacuum circuit breaker is HV indoor switchgear with rated 12KV,tri-phase AC 50HZ, and product is introduced the technology of Swish ABB company combined with development of domestic industry,and producig capability,the whole operating mechanism,which adopts complex insulating material,pollution-proof,strong insulation.Operating mechanism of VS1 series HV vacuum circuit breaker is type of spring energy storage,and can be operated by AC and operated by manual.