The Siemens 3RH2140-2BP40 is a SIRIUS auxiliary contactor in size S00, carrying 4 normally-open instantaneous contacts. It's the signal-switching sidekick to a main contactor or starter — extends the control circuit without adding another power device. Rated 10 A at both 24 V and 230 V, so it handles typical PLC-level loads and small valve solenoids across the common control voltages without derating at the low end.
Mechanical life of 30 million operations means this contactor will outlast most machines it's installed in — the contacts, not the mechanism, will be the wear item. Coil draws 4 W DC both closing and holding — no inrush spike to sag your 24 VDC supply, and the constant draw simplifies thermal management in a dense panel.
Accepts 2 x 0.5 to 4 mm² solid or stranded wire per terminal — standard for control wiring up to 10 A. The auxiliary switch block can be extended with additional contact modules if the 4 NO built-in isn't enough for your feedback or interlock scheme.
RoHS compliance dated October 2009, so it meets the EU directive for new installations. No REACH or UL marking is stated in the available documentation.