The Siemens SIRIUS 3UG4631-1AA30 is a voltage monitoring relay with digital setting, designed to detect both overvoltage and undervoltage conditions on AC/DC systems. It operates from a 24 V rated supply (50/60 Hz) and fits a standard 22.5 mm DIN-rail slot with snap-on mounting — no tools needed for installation. The LCD display shows the measured value and setpoint, making commissioning straightforward without a separate meter.
The 24 V rated supply is the relay's own operating voltage — not the monitored circuit. The measurable voltage range on AC starts at 0.1 V up to 60 V, so this relay is suited for low-voltage AC/DC monitoring, not 400 V mains. The output contacts are rated 1 A at 24 V, 0.2 A at 125 V, and 0.1 A at 250 V — these are signal-level switching capacities, not motor-load contacts. Use them to drive a PLC input, alarm annunciator, or contactor coil via an interposing relay if needed.
The 22.5 mm width matches standard terminal-block spacing, so it fits neatly alongside other SIRIUS control gear. IP20 means finger-safe terminals but no protection against moisture — install inside a panel with at least IP54 enclosure. Wire termination accepts solid or stranded conductors 20–14 AWG, two per terminal.