The Siemens 3RH1344-2AF00 is a SIRIUS auxiliary contactor in frame size S00, carrying four normally-open instantaneous contacts and no delayed or leading/lagging switching elements. This is the part for extending control-circuit contact density on a contactor or relay base — it mirrors the main contactor's coil state to additional signal paths. Rated for 10 A at 24 V, 6 A at 230 V, and 1 A at 690 V, the contact ratings cover the typical control-voltage range found in IEC panels. The 4 NO arrangement gives you four independent make contacts that close when the coil picks up — no overlap with NC or changeover contacts on this variant.
Mounting and integration
Mounts via screw and snap-on to DIN rail. The 45 mm width matches the S00 footprint — one standard 45 mm module on the rail. Mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward, so it fits in tight enclosures where the rail orientation isn't perfectly vertical. Terminals accept 2x solid conductors from 0.25 to 2.5 mm². Depth is 114 mm, height 60 mm — check clearance to the gland plate if the panel is shallow.
Lifecycle and compliance
RoHS compliance date is 01.07.2006, covering the EU RoHS directive. The reference code per IEC 81346-2 is K (contactor/relay). Protection class on the front is IP20 — suitable for enclosed panel use, not for washdown or outdoor exposure.
Contact reliability and operating conditions
Contact reliability is specified as one incorrect switching operation per 100 million operations at 17 V, 1 mA — this matters for PLC-level signal switching where dry-circuit reliability is a concern. The mechanical life is rated at 10 million operations typical. Operating temperature range is -25 to +60 °C; storage and transport range is -55 to +80 °C. Shock resistance is 10g / 5 ms and 5g / 10 ms. Pollution degree 3, meaning it tolerates conductive pollution in industrial environments where occasional condensation occurs.