... protection 3) MCU control, no brush, no wea ST Step-down transformer Specifications Specifications :1.Input voltage:rated voltage +/-10% 2 ... Control Transformer(BK,SBK),power transformer,electric transformer,JBK Machine Tool Control Transformer, Transformer,BKC,JBKDG & SGPower Transformer,Dry type transformer ... :≥95%4.Waveform distortion:no additional waveform distortion ST Step-down transformer