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Siemens 3RH2122-2XG40-0LA2 — Contactors

Siemens 3RH2122-2XG40-0LA2 SIRIUS Contactor Relay, DC 125V,

MPN3RH2122-2XG40-0LA2

Siemens SIRIUS contactor relay for railway applications, 3RH2122-2XG40-0LA2, S00 frame, DC-13 rated 125 V, 10 A at 24 V, 73 × 45 × 70 mm, screw and snap-on mounting.

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

Specifications

3RH2122-2XG40-0LA2 — Identification
ParameterValue
Contactor frame sizeS00
3RH2122-2XG40-0LA2 — 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
3RH2122-2XG40-0LA2 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RH2122-2XG40-0LA2 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH2122-2XG40-0LA2 — 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 standard mounting rail
Side-by-side mountingYes
3RH2122-2XG40-0LA2 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RH2122-2XG40-0LA2 — Environmental
ParameterValue
Operating temperature range-40 ... +70 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RH2122-2XG40-0LA2 — Mechanical
ParameterValue
Width45 mm
Height70 mm
Depth73 mm

Product details

S00 frame, DIN-rail mount

S00 frame size — 73 mm deep, 45 mm wide, 70 mm tall. That covers the odd panel angles you get in locomotive cabinets or wayside enclosures.

DC switching and timing

DC switching current is rated per voltage step: 10 A at 24 V, 4.7 A at 60 V, 3 A at 110 V, 1.2 A at 220 V, 0.5 A at 440 V, 0.26 A at 600 V, and 1 A at 690 V. The magnet coil draws 4.5 W to close and holds at 0.75 W — the holding power is low enough that a 24 VDC supply with modest current capacity can keep it sealed without overheating.

Current production — no phase-out notice. The contactor relay carries a mechanical life of 30 million typical operations. RoHS compliance date is 2009-10-01.

Frequently asked questions

What is the depth of 3RH2122-2XG40-0LA2?

The depth is 73 mm, width 45 mm, height 70 mm — S00 frame size.

Will 3RH2122-2XG40-0LA2 drop into a panel specified for 3RH2122-1BW40?

Both are SIRIUS S00 frame contactor relays with the same 73×45×70 mm footprint and 35 mm DIN-rail mounting. The -2XG40-0LA2 carries a built-in varistor surge suppressor and is rated for railway DC-13 duty; the -1BW40 is a standard AC/DC variant without the varistor. Mechanically they swap, but verify the coil voltage and surge suppression match your circuit.

What compliance documentation does this part carry?

RoHS compliance dated 2009-10-01, with substance prohibitions per EU directive. Standard SIRIUS documentation includes CE, IEC/EN declarations, and REACH data available on request.

MPN
3RH2122-2XG40-0LA2