This Zelio Logic SR3 compact smart relay / programmable controller uses a supply voltage of 24V direct current. It has 26 inputs / outputs with screw-clamp terminals. It has compact design, allowing installation on DIN rail. It also offers simple programming, display and diagnosing of malfunctions display and navigation buttons. Its simple ladder programming makes it adapted for non-specialists. SR3B261BD Zelio2,MODULAR CLOCK,26I/O,24DC,DISPLAY