The distribution box has the characteristics of small volume, easy installation, special technical performance, fixed position, unique configuration function, unrestricted site, common application, stable and reliable operation, high space utilization rate, small land occupation, and environmental protection effect. It is a control center that commands the reasonable distribution of electrical energy among various components in the power supply line, a reliable control link that accepts the upper power supply, correctly feeds out load electrical energy, and is also the key to obtaining user satisfaction with power supply quality. Improving the operational reliability of power distribution boxes is the goal of creating high-quality engineering.