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24kv ZW32 Outdoor Air Circuit Breakers for mining, industrial enterprises, substation Air Circuit Breakers Technical parameter Table 1 Circuit Breaker's Main Technical Data 　 　 　 Data NO Item Unit 24kv 1 Rated voltage kV 24 2 Rated frequency Hz 50 3 Rated current A 630/1250 4 Rated short circuit breaking current 　 kA 20/25 5 Rated peak withstand current 　 kA 50/63 6 Rated short time withstand current/ lasting time kA/s 20/4 , 25/4 7 Rated short circuit closing current(peak)