Medium volt vaccum circuit breaker (vcb) description operation range : 5kv - 40.5kv operating current range : 630,1250,2000,3150,4000a sc breaking current range: 25,31.5,35,40,50,63ka(ik) rated duration of sc : 3sec short time withstand current: 2.5 * ik type : indoor outdoor , fixed withdrawable application : distribution networks industrial distribution rapid auto-reclosing applications switching duties for capacitor, motors, auxillary, generator units for power plants.