St-series generator is of drip-proof, salient pole rotating field self-excitaltion and constant voltage type. The alternator inside is used with high quality electric magnetic and electrical materials. Stator insulation is of Class E (or B). rotor insulation is of Class B. These generators are excellent in appearance. they are consolidate in construction and easy to maintain. Dimensions are adopted IEC standard, they are suitable for Australia, Europe, America and other countries if the end covers are model B.