... OEM manufacturing 3.H class insulatio open diesel generator, stamford alternator 20-1000kw, watercooled, brushless, 400V-230V voltage, 50Hz, 1500RPM ... winding avoids excessive neutral currents.C. Dynamically balanced rotors with sealed-for life ball bearing and single construction.D. Class"H" ... for your inquiry and further cooperation! Stamford BRUSHLESS THREE-PHASE A.C. SYNCHRONOUS ALTERNATORS