A connector connects first electrodes of circuits to pair of cables having different sizes, such as different sized conductors or different sized insulators around same sized conductors. The connector has two parts connected by a hinge. The two parts include recesses that form two different sized openings in a closed position of the connector, for receiving the different sized cables in a non-interchangeable way. Forks or pins of different sizes stick out from the recesses for contacting the conductors of the cables.