What It Is and What It Does
The Siemens SIRIUS 3RH2140-1BE80 is a Size S00 auxiliary contactor with four normally-open instantaneous contacts, intended for switching control circuits in industrial panels. The 24 VDC coil draws 4 W closing and holding, so the control transformer sizing is straightforward — no inrush spike beyond the holding power.
Key Ratings and What They Mean for Fit
Rated operational current at 24 V is 10 A; at 230 V it's also 10 A, but at 400 V it drops to 3 A, and at 690 V it's 1 A. The 10 A rating at 24 V and 230 V covers most control-circuit loads — relay coils, pilot lights, PLC inputs — while the 3 A at 400 V and 1 A at 690 V handle switching of small contactor coils or valve solenoids in higher-voltage panels. Mechanical life is 30 million operations typical, so it's rated for high-cycle applications like packaging lines or conveyor interlocks where the contactor cycles every few seconds.
Mounting and Integration
Snap-on onto 35 mm DIN rail per EN 60715; also accepts screw fixing. The 45 mm width and 73 mm depth fit standard S00 footprint — four units side-by-side on a 180 mm DIN rail section. Mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward, so it fits tight enclosures where the rail is oriented oddly.