Abstract: A multi-pin terminal adapter for connection to a printed circuit board comprises a generally rectangular substrate having a row of transversely extending guide grooves distributed in equally spaced relation over each of its four sides. A multiplicity of contact pins each extend discretely in and through the guide grooves for connection with the printed circuit board. The substrate has a cavity dimensioned to receive an integrated circuit for connection between the multi-pin terminal adapter and a relay socket which is releasably connected to the substrate.