... -1 2. three-phase alternator 3. safety usage 4.ACalternator STC series alternator are used in town,countyside,worksites,villages and ... °C)Relative air humidity: not exceed 90%TECHNICAL DATA:MODEL: STC-40OutputKVA50KW40Voltage (V)400/230Curernt (A)72.2Power factor (cos)0 ... .8Speed (r/min)1500Freq. (Hz)50Pole Number4 STC-40 AC Synchronous Alternator