The Siemens 3RH1344-2BB40 is a SIRIUS auxiliary contactor — a 24 VDC-controlled, 4-NO switching block sized for Size S00 contactor systems.
Rated 10 A at AC-12 (resistive loads at 24 V), and 1 A at 110 V or 0.27 A at 220 V — that's the switching capacity for its auxiliary contacts under different control voltages. The 4 NO contacts are instantaneous (no make-before-break or delayed switching), so it's a straight on/off relay block for signal-level or pilot-duty circuits. Coil holds at 24 VDC nominal, pulling 3.2 W to close and the same 3.2 W to hold — no inrush spike to stress a DC supply.
That covers most cabinet layouts without needing a special bracket. Depth is 114 mm, which fits standard 120 mm deep enclosures. Wire termination accepts 2x (0.25 … 2.5 mm²) solid or 2x (0.25 … 1.5 mm²) fine-stranded with ferrules — standard for control wiring.
Shock resistance is 10g / 5 ms and 5g / 10 ms — robust enough for industrial panels on conveyors or machine tools. Surge voltage withstand is 6 kV, covering common transient events in industrial mains.