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Siemens 3RH2131-1XF40-0LA2 — Contactors

Siemens 3RH2131-1XF40-0LA2 SIRIUS Contactor Relay, 72-125 VD

MPN3RH2131-1XF40-0LA2
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Siemens SIRIUS contactor relay for railway applications, 3RH2131-1XF40-0LA2, 72-125 VDC coil, 3 NO instantaneous contacts, screw and snap-on 35 mm DIN rail mounting, size S00.

Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
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Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

3RH2131-1XF40-0LA2 — Identification
ParameterValue
Contactor frame sizeS00
3RH2131-1XF40-0LA2 — 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
3RH2131-1XF40-0LA2 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RH2131-1XF40-0LA2 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH2131-1XF40-0LA2 — Connection & Mounting
ParameterValue
Conductor cross-section, solid or stranded2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Mounting methodscrew and snap-on mounting onto 35 mm standard mounting rail
Side-by-side mountingYes
3RH2131-1XF40-0LA2 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RH2131-1XF40-0LA2 — Environmental
ParameterValue
Operating temperature range-40 ... +70 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RH2131-1XF40-0LA2 — Mechanical
ParameterValue
Width45 mm
Height58 mm
Depth73 mm

Product details

Terminals accept solid or stranded copper: 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², or a single 2x 4 mm². That covers standard panel wire up to 12 AWG. Coil power draw: 4.5 W closing, 0.75 W holding — the holding power is low enough that a 24 VDC control supply can run several relays without overloading a small PSU.

The substance prohibition date of 10/01/2009 aligns with the original RoHS compliance deadline; the part meets RoHS and REACH requirements for railway equipment. Operating temperature range: -40 to +70 °C; storage: -55 to +80 °C — covers the full EN 50155 T1/T2 class range.

Frequently asked questions

What is the closest functional second-source to 3RH2131-1XF40-0LA2?

The closest functional peer is 3RH2122-1BW40 — same S00 size, same 3 NO contact configuration, and same 35 mm DIN rail mounting. The key difference is the coil voltage: the 3RH2122-1BW40 is rated for a different coil voltage range, so verify your control supply before substituting. The 3RH2140-1BP40 and 3RH2122-1BA40 are also S00-size contactor relays but with different coil ratings or contact arrangements.

Will 3RH2131-1XF40-0LA2 drop into a panel specified around 3RH2122-1BW40 without rewiring?

Yes, the mounting footprint is identical — both are S00 size, 45 mm wide, snap onto 35 mm DIN rail, and share the same clearance requirements (10 mm upwards, forwards, downwards; 6 mm side). The terminal layout and wire sizes (2x 0.5–2.5 mm²) are also the same, so no panel rework is needed. Just confirm the coil voltage matches your control circuit.

MPN
3RH2131-1XF40-0LA2