The RC 1 is a very compact and universal relay card with alternating (NC/ NO) relay function. Connection of the relay is provided via screw terminal with wire protection. Control signal and supply is connected via 15 cm cable. Transistor control of the relay means a very low control signal is required (1 mA). An activated relay is indicated via a LED. On the back of the device there is a self-adhesive pad for ease of installation.