Phase Control Regulator STL-F-3 1.for brush-type generator 2. is applicable to T2S,T2X,TZH,TFX series 3.1 year warranty Phase Control RegulatorAVR ... STL-F-3 Sensing input Voltage:220/400VAC , 1 phase 2 wire Frequency:50 ... ~60HzExciting voltage:20~100VDCPartial current: STL-F-1 15A , STL-F-2 25A , STL-F-3 30 ...