The new XL-21 power box is widely used in power plants and industrial and mining enterprises. It is used for power or lighting distribution in three-phase three wire, three-phase four wire, three-phase five wire and other distribution systems with three-phase AC below 500V. It is installed indoors against the wall, operated in front of the screen, and maintained in front of the screen. The box is a fully enclosed structure, assembled from C profiles or 8MF profiles. The box adopts a new type of rotating load isolation switch, which can be operated with load. The front door is equipped with voltage and current indicating instruments, as well as signal lights, buttons, conversion switches and other main components. This distribution box adopts self-designed new components, with a compact structure, beautiful and elegant appearance, and convenient maintenance. Multiple wiring schemes are available for users to choose from, making it an ideal product to replace the old XL-21 power box.