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Siemens 3RH1122-2KB40-0LA0 — Contactors

Siemens 3RH1122-2KB40-0LA0 SIRIUS Auxiliary Contactor, 24 VD

MPN3RH1122-2KB40-0LA0

Siemens SIRIUS auxiliary contactor, size S00, 4-pole (2 NO + 2 NC), 24 V DC coil with integrated varistor, screw and snap-on mounting, IP20 front.

$33.56Ref. price · indicative, final on quote
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

3RH1122-2KB40-0LA0 — Identification
ParameterValue
Contactor frame sizeS00
3RH1122-2KB40-0LA0 — 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 V6 A
Rated value @ 24 V10 A
Rated value @ 110 V1 A
Rated value @ 220 V0.27 A
3RH1122-2KB40-0LA0 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RH1122-2KB40-0LA0 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH1122-2KB40-0LA0 — Connection & Mounting
ParameterValue
Conductor cross-section, solid2x (0.25 ... 2.5 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.25 ... 1.5 mm²)
Mounting methodscrew and snap-on mounting
3RH1122-2KB40-0LA0 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RH1122-2KB40-0LA0 — Environmental
ParameterValue
Operating temperature range-40 ... +70 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RH1122-2KB40-0LA0 — Mechanical
ParameterValue
Width45 mm
Height60 mm
Depth73 mm

Product details

It carries a 24 V DC coil with an integrated varistor surge suppressor, and its 4-pole contact arrangement gives you 2 normally-open and 2 normally-closed auxiliary contacts. The coil draws 11 W during closing and holds at 4 W, so the control transformer sizing is straightforward — no inrush surprise. Contact ratings are given per voltage: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, and 1 A at 690 V. That covers most control-voltage rails you'll find in a panel.

The mounting position is flexible: +/-180° rotation on a vertical surface, and can be tilted forward or backward by +/-22.5°. That matters when you're shoehorning it into a crowded panel. Terminals accept 2x (0.25 to 2.5 mm²) solid or stranded wire. Depth is 73 mm, width 45 mm, height 60 mm; it's a compact footprint that fits standard S00 contactor spacing.

Operating temperature range is -40 to +70 °C; storage and transport range is -55 to +80 °C. Shock resistance is 10g / 5 ms and 5g / 10 ms. RoHS compliance dated to July 1, 2006. Contact reliability is spec'd at one incorrect switching operation per 100 million operations at 17 V, 1 mA — that's the low-energy dry-circuit performance you need for PLC inputs or signal-level switching.

Frequently asked questions

Will 3RH1122-2KB40-0LA0 drop into a panel built for 3RH2122-1BA40?

Both are size S00 Siemens auxiliary contactors with screw and snap-on mounting, so the footprint and DIN-rail clip are the same. The 3RH2122-1BA40 has a different coil voltage and contact arrangement — verify those against your circuit before swapping.

MPN
3RH1122-2KB40-0LA0