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Siemens 3RH1122-2BW40 — Contactors

Siemens 3RH1122-2BW40 SIRIUS Auxiliary Contactor, 48 VDC, 10

MPN3RH1122-2BW40

Siemens SIRIUS auxiliary contactor, size S00, 48 VDC coil, 10 A AC-12 rated, 2 NO + 2 NC contacts, screw and snap-on mounting, IP20 front protection.

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

3RH1122-2BW40 — Identification
ParameterValue
Contactor frame sizeS00
3RH1122-2BW40 — Ratings & Performance
ParameterValue
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
3RH1122-2BW40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RH1122-2BW40 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH1122-2BW40 — Protection & Coordination
ParameterValue
Aux. switch short-circuit protection, fusefuse gL/gG: 10 A
3RH1122-2BW40 — Connection & Mounting
ParameterValue
Conductor cross-section, solid2x (0.25 ... 2.5 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.25 ... 1.5 mm²)
3RH1122-2BW40 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RH1122-2BW40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
3RH1122-2BW40 — Mechanical
ParameterValue
Width45 mm
Height60 mm
Depth73 mm

Product details

It carries a 48 VDC coil and is rated for 10 A in AC-12 duty, which covers resistive and solid-state loads typically found in PLC output circuits and relay logic panels. The contact arrangement is 2 normally-open and 2 normally-closed instantaneous contacts, giving you four isolated poles for feedback, interlock, or permissive signals.

Side clearance is zero — adjacent devices can butt up. The IP20 front protection means it's suited for enclosed panels where tools are the only access; no washdown rating.

Switching capacity across voltages

The AC-12 rating at 10 A is the headline figure, but the contactor also carries defined switching capacities at other voltages: 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, and 1 A at 690 V. For DC control circuits, it switches 10 A at 24 V, 1 A at 110 V, and 0.27 A at 220 V. These values define the load-break capability per pole — useful when interposing between 24 VDC PLC outputs and higher-voltage contactor coils.

Shock rated at 10g for 5 ms and 5g for 10 ms. Mechanical life is typical 30 million operations.

Coil and operating range

Operating range is 0.8 to 1.1 times rated voltage, so pickup is guaranteed at 38.4 V and the coil withstands 52.8 V continuous.

Frequently asked questions

What is the difference between 3RH1122-2BW40 and 3RH2122-1BW40?

The 3RH2122-1BW40 is a physically larger size S2 auxiliary contactor (wider footprint) with a different coil voltage. The 3RH1122-2BW40 is size S00 (45 mm wide) with a 48 VDC coil. They are not drop-in interchangeable — the S2 unit requires more DIN rail space and a different coil supply.

Where can I buy 3RH1122-2BW40 and get current pricing?

This part is sourced to order against an RFQ through independent distribution. Submit a request for quote to confirm current availability and pricing at the time of your order.

What is the contact configuration of 3RH1122-2BW40?

It has 2 normally-open instantaneous contacts and 2 normally-closed instantaneous contacts, for a total of four isolated poles. There are no leading, lagging, delayed, or make-before-break contacts on this variant.

What compliance documentation is available for 3RH1122-2BW40?

As a Siemens SIRIUS product, this auxiliary contactor is designed to meet IEC/EN 60947-5-1 standards. Specific compliance documentation (RoHS, REACH, UL, CSA) should be requested at quote time to confirm current declarations for your jurisdiction.

MPN
3RH1122-2BW40