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In case of a power outage, the kinetic energy accumulated in the outer rotor or accu-rotor) supplies the load until the diesel engine is running at its rated speed. Within seconds the diesel engine becomes the source of power and this is how your critical loads are always fully secured. All this happens, without the slightest interruption or aberration to the load. The Kinetic Energy Accumulator At the heart of the NO-BREAK KS is its kinetic energy accumulator: a clever but simple system to store and retrieve kinetic energy. It consists of two rotating parts: the outer rotor runs mechanically-free around the inner rotor. The inner rotor, driven by the main shaft, rotates at 1500 rpm (50 Hz) or 1800 rpm (60 Hz). It contains two sets of windings; a three-phase AC winding and a DC winding.