The Siemens 3RH2344-1CU00-0KA0 is a SIRIUS auxiliary contactor, size S00, with 4 normally-open instantaneous contacts. Dimensions are 57.5 mm high, 45 mm wide, 117 mm deep.
Contact ratings — what they mean on the line
Rated operational current is 10 A at 24 V, 6 A at 230 V AC, 3 A at 400 V AC, and 1 A at 690 V AC. These are the thermal continuous currents the contacts can handle at those voltages — not surge, not motor inrush. For DC switching: 4.7 A at 60 V, 1.2 A at 220 V, 0.5 A at 440 V, and 0.26 A at 600 V. That DC curve drops fast as voltage rises; don't expect 10 A DC at line voltage. That's a lot of cycles for a signal-level contactor — well into the millions before the spring stack or linkage wears.
Integration — clearances and wiring
That's tight-side-by-side spacing — you can gang multiple units on the rail without breathing room. Pollution degree 3, so it's rated for the conductive-dust environment of an industrial panel. Terminals accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm² solid or stranded. That covers most control-circuit wiring sizes. Fastening method is screw and snap-on — the screw terminals hold the wires, the snap-on clips lock it to the DIN rail.
Compliance — RoHS date and environmental
RoHS compliance date is 07/01/2006 — the part was designed to meet the original RoHS directive cutoff. That's standard for Siemens SIRIUS gear; the declaration covers the substance prohibitions in place at that date. Relative humidity minimum is 10 %. No upper bound listed in this record, but typical industrial contactors handle up to 95 % non-condensing.