The newly developed Liebert MPX is a configurable, modular power distribution unit for server racks. It was particularly created for the purpose of responding to changing requirements in a fast-moving data centre environment. Frequent server additions or relocations make special demands of the power distribution unit, which are excellently met with this modularity in particular. For this purpose, modules are simply attached to the mounting rail, a process that can be undertaken even during operation. This guarantees the required power distribution flexibility. Design and function of the power distribution unit form a clear, modular structure. It assures a high degree of functionality and quality within the smallest of spaces.