ZW20-12(F) Series Three Phases Electrical Vacuum Circuit Breakerintelligent outdoor circuit breaker / pole-mounted circuit breaker / eletrical vacuum circuit breakerZW20-12(F) Series Three Phases Electrical Vacuum Circuit BreakerEnvironmental Conditions:Altitude:2000 metersAmbient temperature:outdoors -30℃~+55℃The highest annual average temperature is 20℃Maximum daily average temperature is 30℃Relative humidity:95% (25℃)Seismic capacity:ground level acceleration 0.3gGround vertical acceleration 0.15g/While acting for three sine waves/Safety factor 1.67 More» click» https://www.henganshun-electric.com/product-detail/ZW20-12-F---Series-Three-Phases-Electrical-Vacuum-Circuit-Breaker_34924.htmlclick» https://www.us764.com/news/
