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Siemens 3RH2131-2BM40 — Contactors

Siemens 3RH2131-2BM40 SIRIUS Auxiliary Contactor

MPN3RH2131-2BM40
Active

Siemens SIRIUS auxiliary contactor, size S00, 3 NO instantaneous contacts, 4 W DC coil, screw and snap-on mounting for 35 mm DIN rail, 73 mm depth.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

3RH2131-2BM40 — Identification
ParameterValue
Contactor frame sizeS00
3RH2131-2BM40 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated value @ 400 V3 A
Rated value @ 500 V2 A
Rated value @ 690 V1 A
Rated value @ 230 V10 A
Rated value @ 24 V10 A
Rated value @ 60 V4.7 A
Rated value @ 110 V3 A
Rated value @ 220 V1.2 A
3RH2131-2BM40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RH2131-2BM40 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH2131-2BM40 — Connection & Mounting
ParameterValue
Conductor cross-section, solid or stranded2x (0,5 ... 4 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 2.5 mm²)
Mounting methodscrew and snap-on mounting onto 35 mm standard mounting rail
3RH2131-2BM40 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RH2131-2BM40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RH2131-2BM40 — Mechanical
ParameterValue
Width45 mm
Height70 mm
Depth73 mm
3RH2131-2BM40 — Specifications
ParameterValue
At AC10 000 1/h

Product details

It carries three normally-open instantaneous contacts rated for switching loads across a wide voltage range: 10 A at 24 V and 230 V, 3 A at 110 V and 400 V, 1.2 A at 220 V, and down to 0.26 A at 600 V. That voltage spread means it handles everything from 24 VDC PLC outputs up to 690 VAC control circuits without derating surprises.

Coil and control side

The DC coil draws 4 W during both closing and holding — no inrush spike to size your power supply around. That steady 4 W draw is the same whether the contactor is just pulled in or has been held for hours, so the thermal load on the panel is predictable. The auxiliary switch extension option means you can add more contact blocks on top if the three built-in NO contacts aren't enough for your feedback or interlock scheme.

Switching performance and mechanical life

On DC, the arcing time stretches to 7 to 13 ms — worth noting if you're switching inductive DC loads where arc extinction is slower.

Frequently asked questions

What is the difference between 3RH2131 and 3RH2131-2BM40?

The 3RH2131 is the base series designation for a SIRIUS size S00 auxiliary contactor with three NO contacts. The -2BM40 suffix specifies the exact variant with a 4 W DC coil and screw-type terminals. Other variants like 3RH2131-1AH00 may have different coil voltages or terminal types.

MPN
3RH2131-2BM40