... poles 2) Embedding the interrupter in resin makes the circuit-breaker poles particularly sturdy and protects the interrupter against shocks, ... 1) Rated voltage: 12/17.5kV 2) Rated current: 630, 1250, 1600, 2000, 2500, 3150A 3) Rated short circuit breaking current: ... 25, 31.5, 40KA 4) Mechanical life: 30,000, 20,000, 10,000 times Medium Voltage Vacuum Circuit Breaker