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Siemens 3RH1122-2KF40-0LA4 — Contactors

Siemens 3RH1122-2KF40-0LA4 SIRIUS Auxiliary Contactor, 110 V

MPN3RH1122-2KF40-0LA4

Siemens SIRIUS auxiliary contactor, size S00, 3RH1122-2KF40-0LA4, 110 V DC coil, 4 NO + 2 NC contacts, 10 A rated, screw and snap-on mounting, IP20 front.

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

3RH1122-2KF40-0LA4 — Identification
ParameterValue
Contactor frame sizeS00
3RH1122-2KF40-0LA4 — 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
3RH1122-2KF40-0LA4 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RH1122-2KF40-0LA4 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH1122-2KF40-0LA4 — 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
3RH1122-2KF40-0LA4 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RH1122-2KF40-0LA4 — Environmental
ParameterValue
Operating temperature range-40 ... +70 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RH1122-2KF40-0LA4 — Mechanical
ParameterValue
Width45 mm
Height60 mm
Depth123 mm

Product details

It carries a 110 V DC coil and provides four normally-open and two normally-closed instantaneous contacts, rated at 10 A at 24 V and derated to 6 A at 230 V, 3 A at 400 V, and 1 A at 690 V — a curve that tracks the standard AC-15 / DC-13 load profiles for contactor duty.

Solid and stranded conductors from 0.25 to 2.5 mm² (2x per terminal) fit the clamp terminals.

Coil and surge suppression

The DC coil draws 11 W closing power and holds at 4 W — a low-hold design that reduces heat buildup in a densely packed panel. A built-in varistor provides surge suppression across the coil, rated for 6 kV surge voltage resistance, which protects the PLC output or relay driving it from back-EMF spikes.

Environmental and reliability ratings

Shock resistance tested to 10g at 5 ms and 5g at 10 ms. IP20 on the front protects against finger contact.

Frequently asked questions

What is the depth of 3RH1122-2KF40-0LA4?

The depth is 123 mm, with a width of 45 mm and height of 60 mm.

What wire sizes does 3RH1122-2KF40-0LA4 accept?

Each terminal accepts 2x conductors from 0.25 to 2.5 mm², solid or stranded.

MPN
3RH1122-2KF40-0LA4