... manufacturing 3.H class insulatio open diesel generator, stamford alternator 20-1000kw, watercooled, brushless, 400V-230V voltage, 50Hz, 1500RPM AlternatorA ... standard 2/3 pitch winding avoids excessive neutral currents.C. Dynamically balanced rotors with sealed-for life ball bearing ... speed, over load and over current.B. Operation display a. Unit voltage, tri-phase load current and frequency display ...