The Siemens 3RP1540-1AB31 is a SIRIUS timing relay with a single adjustable ON-delay range from 0.05 to 600 seconds, triggered at 24 V DC. Its 5 A thermal current rating (Ith) governs the contact capacity for resistive loads at the rated voltage — at 24 V DC it switches 1 A, derating to 0.2 A at 125 V and 0.1 A at 250 V. The recovery time of 150 ms means the relay resets fast enough for rapid-cycle applications like conveyor indexing or pump sequencing.
Mounts via screw and snap-on onto 35 mm DIN rail (EN 60715) in any orientation — no derating for sideways or inverted positions. The 22.5 mm width and 91 mm depth fit standard sub-distribution boards and control panels; clearance at all sides is 0 mm, so it can be packed tight against adjacent devices. Terminals accept 20–14 AWG solid or stranded wire; tighten to 0.8–1.2 N·m.