MCB ( miniature circuit breaker ) case and cover Specification Electrical featuresRated current InA1, 2, 6, 10, 16, 20, 25, 32, 40, 50, 63 PolesP1,2,3,4 Rated voltage UeV230/400 Insulation voltage UiV500 Rated frequencyHz50/60 Rated breaking capacityA3000, 4500Rated impulse withstand voltage (1.2/50) UimpV4000 ..