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Siemens 3RH1122-2BF40 — Contactors

Siemens 3RH1122-2BF40 SIRIUS Auxiliary Contactor

MPN3RH1122-2BF40

Siemens SIRIUS auxiliary contactor, size S00, 3RH1122-2BF40, 110 VDC coil, 2 NO + 0 NC contacts, 10 A AC-12, screw and snap-on mounting.

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

3RH1122-2BF40 — Identification
ParameterValue
Contactor frame sizeS00
3RH1122-2BF40 — 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
3RH1122-2BF40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RH1122-2BF40 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH1122-2BF40 — Protection & Coordination
ParameterValue
Aux. switch short-circuit protection, fusefuse gL/gG: 10 A
3RH1122-2BF40 — Connection & Mounting
ParameterValue
Conductor cross-section, solid2x (0.25 ... 2.5 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.25 ... 1.5 mm²)
3RH1122-2BF40 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RH1122-2BF40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
3RH1122-2BF40 — Mechanical
ParameterValue
Width45 mm
Height60 mm
Depth73 mm

Product details

What this auxiliary contactor is rated for

Switching capacity drops with voltage: 6 A at 230 V AC, 3 A at 400 V AC, 2 A at 500 V AC, and 1 A at 690 V AC. For DC circuits, it handles 10 A at 24 V, 1 A at 110 V, and 0.27 A at 220 V. These are the contact ratings that govern real-world fit — if your control voltage is 230 V AC, the 6 A limit is the one that matters, not the 10 A AC-12 headline.

The magnet coil is rated 110 V DC with a closing and holding power of 3.2 W. That steady-state draw is low enough for most 24 V DC supplies when stepped up through a converter, but the 3.2 W holding power means the coil driver must be rated for continuous DC duty — no AC coil hum, but the DC coil draws constant power as long as it's energised.

Mounting is by screw or snap-on to DIN rail. Wire termination accepts 2x (0.25 to 2.5 mm²) solid or stranded — that's two conductors per terminal, useful for daisy-chaining control voltage to multiple auxiliary contacts in the same row without extra junction blocks.

Environmental limits and approvals

Shock resistance is 10g for 5 ms and 5g for 10 ms, adequate for machine-mounted panels on presses or conveyors.

Frequently asked questions

3rh1122-2bf40 replacement

This exact part is phased out; buyers need the recommended successor 3RH2122-2BF40 to avoid production delays.

3rh1122-2bf40 obsolescent or end-of-life

Knowing lifecycle status prevents purchasing a non-supported part and helps plan for substitutes.

3rh1122-2bf40 data sheet

Engineers need datasheet to verify fit, pinout, and electrical ratings before design or replacement.

where to buy 3rh1122-2bf40

Sourcing buyers must find stock quickly, especially for phased-out parts that are scarce.

3rh1122-2bf40 equivalent cross reference

Technicians and brokers need compatible alternatives when the original is unavailable.

3rh1122-2bf40 price

Buyers compare prices across distributors to get the best deal, especially for legacy parts.

MPN
3RH1122-2BF40