HBK5 control transfomer (voltage transformer power transformer) is to use in circuit 50/60Hz, output voltage less than 220V... HBK5 Control Transformer/ voltage transformer/ power transformer ApplicationHBK5 series control transfomer is suitable to use in circuit 50/60Hz,input voltage less than 500V,output voltage less than 220V,for various machines,common power supply,signal power supply etc. ...