Skip to main content
Log in
Siemens 3RH2122-2XF40-0LA2 — Contactors

Siemens 3RH2122-2XF40-0LA2 SIRIUS Contactor Relay, 72–125 VD

MPN3RH2122-2XF40-0LA2
Active

Siemens SIRIUS contactor relay, size S00, 72–125 VDC coil with varistor suppression, 2 instantaneous contacts, screw and snap-on mounting on 35 mm DIN rail, for railway applications.

Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

3RH2122-2XF40-0LA2 — Identification
ParameterValue
Contactor frame sizeS00
3RH2122-2XF40-0LA2 — 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
3RH2122-2XF40-0LA2 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RH2122-2XF40-0LA2 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH2122-2XF40-0LA2 — 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
3RH2122-2XF40-0LA2 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RH2122-2XF40-0LA2 — Environmental
ParameterValue
Operating temperature range-40 ... +70 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RH2122-2XF40-0LA2 — Mechanical
ParameterValue
Width45 mm
Height70 mm
Depth73 mm

Product details

It carries a 72–125 VDC coil with a built-in varistor surge suppressor, which clips voltage spikes from the inductive coil — no external free-wheel diode needed on the DC side.

Compliance documentation

The substance prohibition date of 10/01/2009 aligns with the EU RoHS and REACH compliance cutover for this product family. The varistor design is a standard component that does not introduce restricted substances. For a full compliance declaration (RoHS, REACH, UL, IEC), the manufacturer provides a declaration of conformity and material data sheet — these are available on request with the RFQ.

Frequently asked questions

What is the closest functional second-source to 3RH2122-2XF40-0LA2?

The closest functional peer is 3RH2122-2BG40, which shares the same S00 frame, two instantaneous contacts, and DIN-rail mounting. The key difference is the coil voltage: 3RH2122-2BG40 uses a 24 VDC coil, while the 3RH2122-2XF40-0LA2 is wound for 72–125 VDC. If your panel was built around 3RH2122-2BG40, the 3RH2122-2XF40-0LA2 will not drop in without a coil voltage change — the mechanical footprint and wiring are identical, but the coil supply must match.

Where can I buy 3RH2122-2XF40-0LA2?

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 delivery commitment.

What compliance documentation does Siemens provide for 3RH2122-2XF40-0LA2?

The part carries a substance prohibition date of 10/01/2009, indicating RoHS and REACH compliance for this product family. A declaration of conformity and material data sheet are available on request with the RFQ.

MPN
3RH2122-2XF40-0LA2