IS200STCIH4A is a DIN Rail Contact Input Card manufactured by General Electric as part of Mark VI Series used in gas turbine control systems. It was conceived as a tiny board with fifty-one screw connectors and a terminal board running along one long side. E1 and E2 are the labels on the terminal ring on either side of the terminal board. A single 37-pin (female) D-type connector and a single three-position female plug are situated opposite the terminal strip on the board. On the short edges of the board, there are two round apertures cut into the board, one opposite the other. Over 80 resistors, capacitors, diodes, and a single integrated circuit are scattered across the board.