... C. Alternator, 3) Stamford Type of Electric Generator, 4) Three Phase optional, IP23, Class H, 5) Rated voltage 400V, 110-690V ... power networks or other genetator sets, 9) Balance rotor with single or two sealed ball bearings available, 10) Convenient installation ... 1) Rated voltage 400V, 110V-690V for option 2) Three phase, single phase for option 3) Drip-leak-proof structure: IP22 protection class ...