Phoenix Contact 2900324 A PLC-Interface for railway applications is designed to handle high continuous currents and is comprised of a basic terminal block with push-in connections and plug-in miniature relays. The interface comes in various sizes ranging from 0.7 x UN to 1.25 x UN, is rated for the temperature class TX, allowing operation between -40°C and +70°C, and features only one changeover contact. It also accepts input voltage of 24 V DC.