Generally speaking, the small power distribution boards in the market are basically small in size, simple in installation, special in technical performance, fixed in position, unique in configuration function, not limited by site, widely used, stable and reliable in operation, high in space utilization, small in land occupation and with environmental protection effect. It is the control center for commanding various components in the power supply line to reasonably distribute electric energy, the control link for reliably receiving the upper end power supply and correctly feeding out the load electric energy, and the key to obtaining the satisfaction of users with the power supply quality. Improve the operation reliability of the power small power distribution board.