The Siemens 3RH2140-2BW40 is a SIRIUS auxiliary contactor, size S00, with four normally open instantaneous contacts and a 48 VDC coil. Rated switching capacity varies by voltage: 10 A at 24 V and 230 V, 3 A at 110 V and 400 V, 2 A at 500 V, 1.2 A at 220 V, 1 A at 690 V, 0.5 A at 440 V, and 0.26 A at 600 V. These are the AC ratings that govern contact life in motor control or signal switching — match the voltage on your line to the right column. The coil draws 4 W closing and holding power, a steady DC load that stays constant once picked.
RoHS compliance date is 10/01/2009. No UL or CSA listing is stated in the available data, but the SIRIUS platform typically carries those for industrial control panels — verify with your local Siemens support if a specific agency mark is required for your jurisdiction.
The S00 footprint is compact: 45 mm wide, 70 mm tall, 73 mm deep. Maximum switching frequency is 10,000 cycles per hour AC; DC arcing time runs 7 to 13 ms.