1)sx440 avr for 3 phase AC generator 2)3 phase 4 wire,4 pole 3)Brushless,self-excited,double bearing 4)AVR controll, ... SX460 AVR. Brushless, Self-excited, Synchornous.Bearing: Single or Doulbe for option.Frequency: 60Hz is available.Brush: Brushless and Brush available ... rectifier is protected by a surge suppressor against surges caused, for example, by short circuit or out-of-phase paralleling. ...