Abstract: A terminal block is disclosed having a pair of detachable tab portions enabling the terminal block to accommodate a mounting arrangement involving either a round-shaped housing unit resembling a DIN-style module or an oval-shaped housing unit resembling a U.S.-style module. In a first configuration of the terminal block, the detachable tab portions are removed to permit the terminal block to be mounted within a round-type terminal connector head. In a second configuration of the terminal block, the detachable tab portions remain connected to the terminal block to permit the terminal block to be mounted within an oval-type terminal connector head.