The SR2B121BD is a compact smart relay from the Zelio Logic range, designed for small-scale automation systems. It operates with a rated supply voltage of 24V DC and features 8 discrete inputs, 4 of which can be configured as 0-10V/0-24V analog inputs. The unit provides 4 normally open (NO) relay outputs with a thermal current rating of 8A each. Programming is supported via ladder logic (up to 240 lines) or FBD (up to 500 blocks), with a cycle time of 6-90 ms. Equipped with a local display, a real-time clock, and screw terminal connections, this relay is ideal for industrial control applications requiring simple logic, timing, and monitoring.