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Siemens 3RH2122-2LB40-2LA0 — Contactors

Siemens 3RH2122-2LB40-2LA0 SIRIUS Auxiliary Contactor, 24 VD

MPN3RH2122-2LB40-2LA0
Active

Siemens SIRIUS auxiliary contactor, 3RH2122-2LB40-2LA0, size S00, 24 VDC coil, 10 A rated current, screw and snap-on mounting onto 35 mm DIN rail.

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

3RH2122-2LB40-2LA0 — Identification
ParameterValue
Contactor frame sizeS00
3RH2122-2LB40-2LA0 — 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
3RH2122-2LB40-2LA0 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RH2122-2LB40-2LA0 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH2122-2LB40-2LA0 — 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
3RH2122-2LB40-2LA0 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RH2122-2LB40-2LA0 — Environmental
ParameterValue
Operating temperature range-40 ... +70 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RH2122-2LB40-2LA0 — Mechanical
ParameterValue
Width45 mm
Height70 mm
Depth116 mm
3RH2122-2LB40-2LA0 — Specifications
ParameterValue
At AC10 000 1/h

Product details

It carries a 24 VDC coil and is rated for 10 A at 24 V (AC-15 / DC-13 duty), so it handles typical PLC output loads, relay coils, and signal lamps in a control panel.

The S00 footprint — 45 mm wide, 70 mm tall, 116 mm deep — fits alongside contactors in the same rail section.

Ratings and performance

Coil closing power is 13 W at DC, with a built-in varistor surge suppressor across the coil — no external flyback diode needed for DC switching. Mechanical life is typical 30 million operations; switching frequency up to 10,000 cycles per hour at AC.

Frequently asked questions

Where can I buy 3RH2122-2LB40-2LA0?

This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

Will 3RH2122-2LB40-2LA0 drop into a panel specified around 3RH2122-1BA40 without rewiring?

Both are S00 size auxiliary contactors with the same DIN-rail footprint and terminal arrangement, so mechanical fit is identical. The key difference is the coil voltage: the -2LB40-2LA0 runs on 24 VDC, while the -1BA40 is a different coil variant. If the panel was wired for 24 VDC, it drops in without rewiring.

What compliance documentation does this part have?

RoHS compliant with substance prohibition date 10/01/2009. The SIRIUS series typically carries UL, CSA, and CE certifications, though specific approvals are not listed in this evidence set.

MPN
3RH2122-2LB40-2LA0