A terminal block connects individual conductors point to point, organizing and isolating each circuit separately. Same panel, different jobs entirely. Distribution blocks and device terminal blocks Distribution blocks and device terminal blocks feature a compact and modular design. It is the modular, finger-safe alternative to open copper busbar systems used in industrial panels since the 1950s. Purpose: Distribution Block: The primary function of a distribution block is to distribute electrical power from a single. It typically consists of a metal strip or bar that connects the wires through one or more screw terminals.