Abstract: An electrical interconnect or switch device for interconnecting electrical and electronic elements on a printed circuit board uses a carbon/graphite trace is used to connect electrical contact pads on a ceramic or similar substrate. The substrate surface has a plurality of electrically conductive contact pads and a plurality of isolation regions defined on the substrate surface such that each of the contact pads is separated from the remaining contact pads by at least one of the isolation regions. Each of the contact pads may be electrically connected to one or more of the circuit elements on the printed circuit board and a trace means, preferably a carbon/graphite pencil lead, is used to selectively electrically interconnect two or more of the contact pads by tracing between the selected contact pads across at least one of said isolation regions, thereby electrically interconnecting the circuit elements associated with the selected contact pads.