The HZ12A series power supply cut off the switch is applicable to communicate the 50 Hzs(60 HZs) electric voltage 380 Vs(660 Vs) of power supply within the tool machine electricity control electric circuit connect and cut off it with, also can be the total switch of the power supply of the electricity control box( cabinet) of the machine equipmentses, such as foundry, spinning, light work and chemical engineering...etc. and start directly, the Y- start, pour fluently start the alternate current motive etc. the electricity sensitive faculty load of start the switch. The sign is up to standard:GB14048.3-93