The Siemens 3RH2140-2KB40 is a SIRIUS coupling relay — size S00 frame — built to switch auxiliary circuits in control panels. It carries 4 normally-open instantaneous contacts, rated 10 A at 24 V and 10 A at 230 V, with a 24 VDC coil drawing 2.8 W closing power. The built-in suppressor diode handles the coil's inductive kick, so you don't need to add one externally.
The S00 footprint — 45 mm wide, 70 mm tall, 73 mm deep — fits tightly in a crowded enclosure.
Switching capability by voltage
Rated operational current varies by voltage and load type: 10 A at 24 V AC/DC, 4.7 A at 60 V, 3 A at 110 V, 1.2 A at 220 V, 10 A at 230 V, 3 A at 400 V, 0.5 A at 440 V, 2 A at 500 V, 0.26 A at 600 V, and 1 A at 690 V. Mechanical endurance is 30 million operations; electrical switching frequency is 10,000 cycles per hour at AC, with arcing time 10–15 ms. That's a lot of cycles for a relay this size — good for high-duty auxiliary circuits like signal lamps or PLC inputs.