The Siemens SIRIUS 3RP1540-1AN31 is a single-function time relay with an adjustable ON-delay range of 0.05 to 600 seconds, powered by 200-240 V AC at 50/60 Hz. Its 5 A thermal current rating and 1 changeover contact handle control-signal switching in motor starter and conveyor interlock circuits. The 22.5 mm width and screw/snap-on mounting onto 35 mm DIN rail mean it fits standard panel layouts without extra bracketry.
What the ratings mean for fit
The 200-240 V AC control supply is the standard European industrial voltage — common across SIRIUS contactor coils and PLC power supplies — so this relay shares the same bus without a separate transformer. The 0.05-600 s adjustable time range covers short blast-timer sequences (conveyor jog) through long pump-drain delays; the 150 ms recovery time means it resets fast enough for cyclic operations under 7 cycles per minute. Contact ratings at 24 V (1 A,), 125 V (0.2 A,), and 250 V (0.1 A,) define the switching limit for each voltage — use the 24 V figure for PLC digital inputs, the 250 V figure for contactor coils within that current.
Panel integration
Mounts in any position on 35 mm DIN rail via the screw-and-snap mechanism. The 22.5 mm width occupies one standard module slot; depth of 91 mm and height of 83 mm fit within typical 120 mm deep enclosures. Terminal tightening torque is 0.8-1.2 N·m for stranded wire 20-14 AWG. Basic insulation means it is suitable for control circuits within an earthed enclosure, not for direct line-side isolation.