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Siemens 3RH2131-2XB40-0LA2 — Contactors

Siemens 3RH2131-2XB40-0LA2 SIRIUS Contactor Relay, Railway,

MPN3RH2131-2XB40-0LA2
Active

Siemens SIRIUS contactor relay, size S00, 3 instantaneous NO contacts, 24-34 VDC coil with varistor, 73 x 45 x 70 mm, screw and snap-on 35 mm DIN rail, railway applications.

Siemens 3RH2131-2XB40-0LA2 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RH2131-2XB40-0LA2 — Identification
ParameterValue
Contactor frame sizeS00
3RH2131-2XB40-0LA2 — 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
3RH2131-2XB40-0LA2 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RH2131-2XB40-0LA2 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH2131-2XB40-0LA2 — 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 DIN rail
Side-by-side mountingYes
3RH2131-2XB40-0LA2 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RH2131-2XB40-0LA2 — Environmental
ParameterValue
Operating temperature range-40 ... +70 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RH2131-2XB40-0LA2 — Mechanical
ParameterValue
Width45 mm
Height70 mm
Depth73 mm

Product details

Coil and switching ratings

Coil rated at 24-34 VDC; the inrush peak hits 2.3 A, then the holding current settles to a mean 40 mA. The locked-rotor current peak is 0.18 A, and the arcing time runs 10-15 ms. Switching capacity varies by load voltage: 10 A at 24 V and 230 V, 4.7 A at 60 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. The at-DC operating time spans 25-45 ms. These numbers govern what loads this relay can break — match the voltage column to your circuit.

Side-by-side mounting is permitted — no gap needed between units.

Sourcing posture

Frequently asked questions

Where can I buy 3RH2131-2XB40-0LA2 and what is the lead time?

This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm lead-time commitment.

What is the closest functional second-source for 3RH2131-2XB40-0LA2?

The 3RH2131-2AK60 is a peer in the same SIRIUS S00 contactor relay family, but it carries a different coil voltage and suppression variant. The 3RH2131-2XB40-0LA2 is specifically a railway-designated unit with a 24-34 VDC varistor coil — verify coil compatibility before substituting. No official cross-reference exists; the 2XB40-0LA2 is the exact railway-spec order code.

What is the depth of 3RH2131-2XB40-0LA2?

The depth is 73 mm, with a width of 45 mm and height of 70 mm. The size S00 frame fits standard 35 mm DIN-rail panels with the specified clearances.

Will 3RH2131-2XB40-0LA2 drop into a panel specified for 3RH2131-2AK60?

Both are size S00 contactor relays on the same 35 mm DIN-rail footprint with identical dimensions (73 x 45 x 70 mm) and clearance requirements. The physical swap is straightforward, but the coil voltage differs — the 2XB40-0LA2 uses a 24-34 VDC coil with varistor suppression versus the 2AK60's coil. Check the coil circuit before dropping it in.

What compliance documentation does Siemens provide for 3RH2131-2XB40-0LA2?

The substance prohibition date of 10/01/2009 confirms RoHS compliance for the varistor and all materials. The part is designed for railway applications, which implies IEC 60077 / EN 50155 compliance for rolling stock, though the specific certification markings (UL, CSA, CE) are not listed in the spec record. Request the manufacturer's declaration at RFQ time for your compliance file.

MPN
3RH2131-2XB40-0LA2