What it is — and what the ratings mean for fit
The Siemens 3RH1344-1BE40 is a SIRIUS auxiliary contactor in frame size S00, designed for control-circuit switching in motor starter and contactor assemblies. It carries four normally-open instantaneous contacts with no delayed, lagging, or make-before-break switching — a straight 4 NO block for straightforward signal extension or interlocking. The headline rating is 10 A at AC-12, which covers resistive and solid-state loads in control circuits — think PLC outputs, relay coils, and indicator lamps. The same contacts are rated 6 A at 230 V, 3 A at 400 V, and 1 A at 690 V, so the voltage-dependent switching capacity is clearly defined per IEC 60947-5-1. For DC switching, the 60 V rated value with an initial make current of 0.8 A and full-scale 1.1 A means this is primarily an AC-rated block; DC derating applies below 60 V. Contact reliability is specified as one incorrect switching operation per 100 million cycles at 17 V, 1 mA — that is the dry-circuit performance for low-level signals, not the power-switching endurance. The mechanical life is 10 million operations, typical for a S00 auxiliary block.
Mounting, wiring, and panel integration
Fastening is screw and snap-on mounting — clips directly onto a DIN rail or screws to a backplate. The mounting position is flexible: +/-180° rotation on a vertical surface, and can be tilted forward/backward by +/-22.5°. Dimensions are 45 mm wide, 57.5 mm high, 111 mm deep — the S00 footprint. The screw terminals accept solid conductors: 2x 0.5 to 1.5 mm², 2x 0.75 to 2.5 mm², or 2x 4 mm². That's enough for two 4 mm² per terminal, which covers most control-circuit wiring without piggyback ferrules. Front protection is IP20 — finger-safe from the front, but not sealed against dust or moisture. Pollution degree 3 means it is rated for conductive pollution in industrial environments, so no additional conformal coating required in a standard panel.
Coil and environmental limits
The DC magnet coil draws 3.2 W for both closing and holding — a continuous-duty coil that does not need a drop-out economizer. 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 — sufficient for most industrial machinery but not for high-g mobile equipment. Surge voltage resistance is rated at 6 kV — the impulse withstand for the auxiliary contact circuit.
Lifecycle and compliance
For compliance documentation: this is a Siemens SIRIUS component, so it carries CE marking under the Low Voltage Directive and typically comes with a manufacturer declaration of conformity. UL/CSA listings are common for the SIRIUS line, though not explicitly stated in this evidence set. The substance prohibition date confirms RoHS compliance from mid-2006 onward.