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Siemens 3RH2122-1KG40-0LA4 — Contactors

Siemens SIRIUS 3RH2122-1KG40-0LA4 Auxiliary Contactor, 2 NO

MPN3RH2122-1KG40-0LA4
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Siemens SIRIUS auxiliary contactor, size S00, 2 NO + 2 NC, 125 V DC coil, screw and snap-on mounting onto 35 mm standard mounting rail, 45 mm width.

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

3RH2122-1KG40-0LA4 — Identification
ParameterValue
Contactor frame sizeS00
3RH2122-1KG40-0LA4 — 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 V10 A
Rated value @ 24 V10 A
Rated value @ 60 V4.7 A
Rated value @ 110 V3 A
Rated value @ 220 V1.2 A
3RH2122-1KG40-0LA4 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RH2122-1KG40-0LA4 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH2122-1KG40-0LA4 — Connection & Mounting
ParameterValue
Conductor cross-section, solid or stranded2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Mounting methodscrew and snap-on mounting onto 35 mm standard mounting rail
3RH2122-1KG40-0LA4 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RH2122-1KG40-0LA4 — Environmental
ParameterValue
Operating temperature range-40 ... +70 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RH2122-1KG40-0LA4 — Mechanical
ParameterValue
Width45 mm
Height57.5 mm
Depth117 mm
3RH2122-1KG40-0LA4 — Specifications
ParameterValue
At AC10 000 1/h

Product details

It provides 2 normally-open and 2 normally-closed instantaneous contacts, rated for DC switching up to 125 V with a built-in suppressor diode across the coil.

The contacts are rated for DC-13 duty (solenoid loads) at several voltage points: 10 A at 24 V, 4.7 A at 60 V, 3 A at 110 V, 1.2 A at 220 V, and 0.26 A at 600 V. For AC loads, the contacts handle 10 A at 230 V, 3 A at 400 V, and 1 A at 690 V. These are not motor-load ratings — they govern control-circuit switching of contactor coils, relays, and pilot devices.

Integration notes

The 45 mm width and size S00 footprint mean it occupies a single 45 mm DIN-rail slot, leaving space alongside a matching contactor or other S00 devices. Wiring accepts 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², or 2x 4 mm² solid or stranded conductors. The built-in suppressor diode eliminates the need for an external free-wheel diode across the coil, simplifying panel wiring.

MPN
3RH2122-1KG40-0LA4