... mainly applies the ZN12-12 vacuum circuit breaker, but also can be equipped with ZN22B-12 vacuum circuit breaker and 3AF, 3AH vacuum circuit breaker of Siemens. 12kv ... )Rated currentA630,1250,1600,2000,2500,3150,4000,5000specified short circuit drop-out currentKA20, 25, 31.5,40,50,63Rated ... short circuit making currentKA50, 63, 80,100,130,160Rated short-time ...