 Eight turbo-generators drove the 380V, 50 Hz electrical system in addition to four Diesel generators located outside each end of the armored citadel for a total capacity of 10,000 kW.The armor scheme of the battlecruisers was quite complex with armor plates of no less than 25 different thicknesses used.Although only designed to withstand cruiser shellfire no less than , or 29% of the total displacement was devoted to armor.