ZW8-12 series outdoor high voltage vacuum circuit breaker is rated voltage 12kV, three-phase AC 50Hz outdoor high voltage switchgear equipment, mainly used to breaking closing rural power off load current, City and small power system, overload current, short circuit current. The overall structure of the three-phase common tank type, three-phase vacuum interrupter in a metal box, use SMC insulation and white insulation and ground insulation, reliable performance, high dielectric strength. ZW8-12G is a combination of ZW8-12 breaker and isolation knife combination, called a combination of circuit breakers, disconnect switches can be used as can also be self-powered with built-PT with an external PT. This series of actuator for the CT23 type spring energy storage actuator, divided into electric and manual together. Model and its meaning The main technical parameters No. Name Unit Data 6.3KA 12.5KA 20KA 1 Rated voltage kV 12 2 Maximum working voltage kV 12 3 Rated current A 630 4 rated load short-circuit breaking current kA 6.3 12.5 20 5 rated short-circuit current ( peak) kA 16 31.5 50 6 Rated peak withstand current kA 16 31.5 50 7 1min rated short withstand current kA 6.3 12.5 20 8 Rated insulation level Power frequency withstand voltage (dry) kV 42 Lightning impulse withstand voltage (peak) 75 Rated operating sequence -0.3S- 9 points in 10 combined points -180S- closing mechanism rated short life times 1,000,011 switching current switching times times 3012 operating mechanism rated switch voltage V 110,220 13 Operating mechanism rated sub-gate voltage V 110,220 14 touch Head open from mm 11 ± 1 15 Overtravel (contact spring compression length) mm 3 16 Three-phase points, closing at different stages of ms ≤2 17 Contact closing bounce time ms ≤2 18 Average opening speed m / s s 0.015-0.05 minimum operating voltage 0.03-0.06 s 0.025-0.05 22 21 Closing time of each phase of the main circuit resistance (combined disconnection at 1.0 ± 0.2 19 Average closing speed m / s 0.7 ± 0.15 20 Opening time maximum operating voltage Main loop resistance) μΩ ≤120 (≤200) 23 static and dynamic contact permission attrition accumulation thickness mm 3