... JBK-5 control transformer which based on domestic BK series machine tool control transformer, adopt strongpoint of national and international similar products ... circuit of 50-60 Hz and input voltage up to 1000V. Its used as a power supply for the machine tool control electrical ... wave.There are following models (power rating) for your option: 50,100, 150, 200, 250, 300, 400, 500, 630, 800, 1000, 1250 ...