A power interconnect system for electronic assemblies, for providing electrical connections between a power supply and a remote electrical conductor element, such as a power bus bar. An electrically insulating block is connected to a bus bar, and holds captive a power coupling connector element for engaging and connecting the bus bar to a power supply. The power coupling connector element includes a conductive end and an insulative end to prevent the supply from shorting out or shocking a maintenance person in contact with the insulative end even when the system is powered up. The conductive end has a larger diameter than the insulative end and the entire power coupling connector element is held captive within the block of insulating material when mounted to a power bus bar, to prevent the power coupling connector element from becoming loose within an electronic assembly.