... YCW1 series intelligent air circuit breakers (hereinafter called ACB) are applied for the network circuit of AC 50Hz, rated voltage 400V, 690V and rated ... , 6300Rated frequencyHz505050Rated operation voltage UeV400,690400,690400,690Rated insulation voltage UiV800800800Arcing distancemm000Rated impulse withstanding voltage Uimp V800080008000Rated operation short circuit breaking capacity Ics(O ...