... poles type high-voltage vacuum breaker 1.24kV,630A,1250A 2.long life,reliable 3.passed test, ... high-voltage vacuum breaker ,apply for rated voltage 24kV, frequency 50Hz three-phase AC power system, ... GB1984"AC high voltage circuit breakers';, DL/T403"12 ~ 40.5kV Indoor AC high-voltage circuit breaker ... post then become the way of solid sealing insulation, represents the highest level of the design and ...