The Siemens SIRIUS 3UG4582-2AW31 is an insulation monitoring relay with analog setting — a dedicated device for detecting insulation degradation in ungrounded AC/DC systems. It monitors AC/DC networks (measurable voltage 0-250 V AC) across a line frequency range of 15-400 Hz, making it suitable for both standard 50/60 Hz power and higher-frequency circuits like motor drives or generators. The adjustable full-scale value (0.85-1.1) sets the insulation threshold, and the delayed switching feature (1 s) prevents nuisance tripping on transient leakage.
Snap-on fastening onto 35 mm DIN rail; 22.5 mm width fits one standard module slot. Mounting position any — no orientation restrictions. Spring-loaded terminals accept 0.5-1.5 mm² finely stranded with ferrule, or 2x (20-16) AWG solid / 2x (18-16) AWG stranded. IP20 rated for enclosed panel use. Zero clearance required upwards, forwards, backwards, downwards, and at the side — the relay can be packed tight against other modules without derating.