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Siemens 3RH1122-1KG40-0LA3 — Contactors

Siemens SIRIUS 3RH1122-1KG40-0LA3 Auxiliary Contactor, 2 NO

MPN3RH1122-1KG40-0LA3

Siemens SIRIUS auxiliary contactor, size S00, 2 NO + 2 NC, 125 V DC coil, screw and snap-on mounting, IP20, 45 x 57.5 x 72 mm.

Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
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Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

3RH1122-1KG40-0LA3 — Identification
ParameterValue
Contactor frame sizeS00
3RH1122-1KG40-0LA3 — 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
3RH1122-1KG40-0LA3 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RH1122-1KG40-0LA3 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH1122-1KG40-0LA3 — Connection & Mounting
ParameterValue
Conductor cross-section, solid2x (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
3RH1122-1KG40-0LA3 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RH1122-1KG40-0LA3 — Environmental
ParameterValue
Operating temperature range-40 ... +70 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RH1122-1KG40-0LA3 — Mechanical
ParameterValue
Width45 mm
Height57.5 mm
Depth72 mm

Product details

It carries 2 normally-open and 2 normally-closed instantaneous contacts, rated for a 125 V DC coil. The front face is IP20 rated, so it suits enclosed panel environments where finger-safe access is needed.

Switching capacity and contact ratings

The contacts are rated for switching at multiple voltage levels: 10 A at 24 V, 1 A at 110 V, 0.27 A at 220 V, 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, and 1 A at 690 V. These are the thermal current values for the auxiliary contacts — use them to size the control circuit load, not the main power path. The contactor includes a built-in varistor surge suppressor across the coil, which limits voltage spikes when the coil de-energises. Coil closing power is 11 W DC; holding power drops to 4 W DC, so the coil driver must supply the inrush but can settle to a lower continuous draw.

The unit withstands shock of 10 g for 5 ms and 5 g for 10 ms. The mechanical endurance is 30 million operating cycles.

Wiring and connection data

The terminals accept solid conductors: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm². The screw-type clamping is standard for panel wiring; strip length and torque follow the manufacturer's installation instructions. The auxiliary switch block is field-expandable — the product extension auxiliary switch is listed as yes, so additional contact blocks can be added to the side of the base unit without removing wiring.

Frequently asked questions

What compliance documentation does this brand provide for 3RH1122-1KG40-0LA3?

The part carries a RoHS compliance date of July 1, 2006, indicating it meets the RoHS directive. The brand, Siemens, typically provides CE, UL, CSA, and IEC declarations for the SIRIUS series; specific certificates are available on request.

MPN
3RH1122-1KG40-0LA3