SIRIUS 3RH2131-1BG40 — Auxiliary Contactor, Size S00, 3 NO
The Siemens 3RH2131-1BG40 is a SIRIUS auxiliary contactor in size S00, carrying three instantaneous normally-open contacts — rated 10 A at 24 V and 10 A at 230 V, with derated curves for higher voltages up to 690 V. It fastens via screw and snap-on onto 35 mm DIN rail, occupying a 45 mm wide footprint at 73 mm depth and 57.5 mm height.
Contact Ratings and Switching Capacity
Each NO contact is rated for a full-scale value of 1.1 and an initial value of 0.8 — these are the making and breaking capacity multipliers per IEC 60947-5-1. At 24 V the contact carries 10 A; at 60 V it carries 4.7 A; at 110 V it carries 3 A; at 220 V it carries 1.2 A; at 230 V it carries 10 A; at 400 V it carries 3 A; at 440 V it carries 0.5 A; at 500 V it carries 2 A; at 600 V it carries 0.26 A; at 690 V it carries 1 A. The arcing time spans 10 to 15 ms, and at DC the contact operates with a 7 to 13 ms timing window.
DIN Rail Integration and Clearances
Mounts on 35 mm DIN rail via the integrated snap-on latch plus screw fastening for vibration resistance. Clearance requirements: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the side. Mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward on a vertical surface — useful for tight panel layouts where the contactor must be oriented to match wire routing.
Environmental and Compliance
Operates from -25 to +60 °C and stores from -55 to +80 °C. Pollution degree 3 (conductive pollution or dry non-conductive pollution that becomes conductive due to condensation). RoHS compliance date is October 1, 2009. The coil draws 4 W closing power and 4 W holding power at DC. Mechanical life is typical 30,000,000 operations. Accepts wire sizes 2x 0.5 to 1.5 mm² solid/stranded, 2x 0.75 to 2.5 mm², or 2x 4 mm².