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, lighting distribution control, etc. The control mode of motor painting line includes direct start control, star triangle step-down start control, self-lotus root step-down start control, frequency converter start control and soft start control. Start-up control and other control modes can also use disconnector switch and fuse switch as isolation breakpoint. Conventional atlas include 99D303-2 fan standard atlas and 01D303-3 pump standard atlas.