The Siemens SIRIUS 3UG4631-1AW38-0AB1-ZX95 is a voltage monitoring relay with digital setting, designed for 22.5 mm DIN-rail mounting. It operates on an 18-27 V AC/DC supply and monitors a measured voltage range of 24 to 240 V AC/DC. The quiescent current principle means the relay is energized in the normal state and drops out on fault, providing fail-safe indication. A built-in noise pulse delay of 0.1 s and hysteresis of 0.1 V prevent nuisance tripping on transients. The single change-over contact (1 CO) is rated for automatic reset, and connections are via screw terminals.
The 22.5 mm width fits standard DIN-rail terminal-block spacing, so it occupies one slot in a crowded panel. The 18-27 V AC/DC supply range covers common 24 V control loops; the wide 24-240 V AC/DC measurement range lets it monitor single-phase or DC bus voltages across a variety of line voltages without a separate PT. The 0.1 s delay and 0.1 V hysteresis are adjustable via digital setting, giving the commissioning engineer control over response to sags or swells without false trips on motor-start dips.
The product brand name is SIRIUS. The substance prohibitance date is 05/01/2012.