The Siemens 3RT2344-1AB00 is a SIRIUS contactor in size S3, with a 24 VAC coil and screw-type terminals for the magnet coil. This is an active-production part, so it's a straight line-item for a BOM — no last-time-buy scramble. The 24 VAC coil is common in European panel designs where a control transformer supplies the coil bus.
Dimensions are 96 mm wide, 140 mm high, 152 mm deep — fits standard S3 contactor footprints in a 400 mm deep enclosure.
Contact ratings and switching
Main contact switching capacity: 10 A at 24 V AC, 6 A at 60 V AC, 6 A at 230 V AC, 3 A at 400 V AC, 2 A at 500 V AC, 1 A at 690 V AC. The arcing time is 10–20 ms; the operating time (AC) is 10–21 ms. Terminals accept solid or stranded wire: 2x (0.5–1.5 mm²) and 2x (0.75–2.5 mm²) for auxiliary circuits; main power terminals take stranded 6–70 mm².
The contactor is part of the Siemens SIRIUS family, which carries UL, CSA, CE, and other global approvals — documentation (RoHS, REACH, UL, IEC) is available from Siemens.