Yuanky ZW8‑12G series outdoor high voltage vacuum circuit breaker adopts total insulation structure with stable performance and high insulation strength. This combined circuit breaker is assembled by vacuum circuit breaker and isolating knife, it can also serve as disconnecting switch, and equipped with CT23 spring energy storage mechanism supporting electric-driven and manual operating modes. It has rated short-circuit breaking current options of 6.3kA,12.5kA and 20kA, rated current covers 630A and 1250A, the mechanical life can reach 10000 times. It has excellent insulation performance and precise operating parameters including contact gap, tripping & closing time, and the primary and secondary current ratio of current transformer ranges from 50-1250/5, suitable for outdoor power grid protection and control.