An electronic assembly with a first substrate and electrical connector terminals mounted on the first substrate. The electrical connector terminals have contact fingers and tracks. A bus bar may be aligned by the tracks such that contact surfaces on the contact fingers press against contact surfaces on the bus bar. The bus bar may slide in the tracks such that, when the bus bar is mounted in an electronic system including the electronic assembly, the electrical connector terminals enable the electronic assembly to slide relative to the bus bar. The electronic system may be implemented as a rack, and the electronic assembly may be or include a printed circuit board on which the electrical connector terminals are mounted. The printed circuit board may be slid in and out of the rack while power is supplied from the bus bar to components on the printed circuit board.