An excitation Support System (SBO) consists of two (2) items: the Reservoir Assembly, and the Power Current Transformer(s) which must be ordered separately. The Excitation Support System makes it possible for the voltage regulator to deliver full forcing output during generator overload or generator short circuit conditions. The Excitation Support System is an ideal accessory for large motor starting applications. (See Bulletin SP-5 or consult with the factory for technical and/or ordering data).