ZN63(VS1)-12 = ABB VD4 ZN63 (VS1) -12 indoor high voltage vacuum circuit breaker is a three-phase AC 50Hz, rated voltage of 12kV ... for frequent operation place. Adopting VET operating mechanism and circuit breaker integrated , design can be used as a fixed installation ... 8 × 10-3MPa.4. Earthquake intensity: not more than eight.5. No fire, explosion hazard, serious filthy, chemical corrosion, as well ...