The ABB 1SVR440721R0300 is a CL-LMR.C18DC2 logic relay — a compact programmable controller for small automation tasks that don't justify a full PLC.
The 12 digital inputs handle sensor or switch signals at 24 V DC, which is the standard control voltage for industrial panels. The 6 relay outputs give you isolated dry contacts for driving contactors, solenoid valves, or indicator lamps — no need for external interposing relays on smaller loads. The 24 V DC supply rail is shared with the input side, so one panel power supply feeds both the logic and the field wiring.
