Integrator note — SIRIUS 3RH2344-2AP00-0KA0
The Siemens SIRIUS 3RH2344-2AP00-0KA0 is a size S00 auxiliary contactor with 4 normally open (NO) instantaneous contacts, rated for a 230 V AC coil at both 50 Hz and 60 Hz. It snaps onto a standard 35 mm DIN rail or screws into the panel — the S00 frame takes up 45 mm width and 121 mm depth, so it fits the typical motor-starter row without crowding the next device. The coil holds across 0.8 to 1.1 times rated voltage at 50 Hz, 0.85 to 1.1 at 60 Hz; dropout below that range is clean, which matters for safety-circuit interlocking where a held-in contactor is a hazard.
Rated currents and switching capability
The 4 NO contacts carry 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V — these are thermal current ratings for the contact block, not motor-starting duty. For DC switching, the same contacts handle 4.7 A at 60 V, dropping to 0.26 A at 600 V. The arcing time of 10 to 15 ms and AC switching time of 4 to 15 ms give the control engineer a window for coordinating with upstream PLC scan cycles or safety relay debounce timing. Mechanical endurance is rated at 10 million operating cycles.
Panel fit and environmental limits
Mounting position is flexible — the contactor can be rotated ±180° on a vertical surface and tilted ±22.5° forward or backward, which helps when laying out a dense panel where wire routing forces an angle. Required clearances are tight: 10 mm upwards, forwards, and downwards, 6 mm at the sides. Operating temperature spans -25 to +60 °C, storage from -55 to +80 °C. Pollution degree 3 means it is rated for industrial environments with conductive dust or occasional condensation — no conformal-coating worry for most cabinet builds.