... protecting cables and equipments against overload and short circuit.2. General rules for choosing MCB:a. Technical data of the network ... b. There are 3curve characteristics for magnetic operation: B curve(3-5 In)protection and control of the circuits against length ... 6,10,16,20,25,32,40,50,63PolesP1,2,3,4Rated Voltage UeV230/400Insulation Voltage UiV500Rated FrequencyHz50/60Rated Breaking CapacityA3000 ...