The C3RY-8 is a 3-Series control card that provides eight isolated, low-voltage relay closures. Each relay is rated 1 Amp at 30 Volts. The card is designed to install in a control card expansion slot of a 3-Series Control System model PRO3 or AV3[1], or 3-Series Card Interface model CEN-CI3-1 or CEN-CI3-3.