Summary: XL-21 series power distribution box(cabinet) is one of the dynamic control device widely used in the low-voltage distribution system.Due to its easy to install,flexible to use,maintenance is simple,and there are economical and luxury for users to choose from,to meet needs of users. It’ssuitable for power system with AC50 HZ,rated voltage 380v,rated current under 630A ,as power distribution ,lighting power distribution and power control and so on. Installation of electrical component is beam or plate;system with agile combination,easy reliable installation,has stong generality,moreover easy to maintain and repair. Accord with IEC60439-1 ,GB7251.1 and other standard requirement.