The control box is suitable for the occasions of factories, mines, enterprises, shopping malls, hotels, schools, airports, ports, hospitals, high-rise buildings, living quarters, etc. AC 50HZ, rated working voltage 380V low-voltage power grid system, as power, lighting distribution and motor control, suitable for indoor wall hanging and outdoor floor installation. Electrical equipment. It is also used in AC 50HZ, power system with voltage below 500V as fire pump control, submersible pump control, fire fan control, fan control and lighting distribution control. The control modes include direct start control, star triangle step-down start control, self-coupling step-down start control, frequency converter start control, soft start control, etc. In all kinds of control modes, disconnectors and fuse switches can also be used as isolation breakpoints. The atlas commonly used in the painting line of the steam drive shaft are the standard atlas of 99D303-2 common fans and 01D303-3 common pumps.