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Siemens 3RH2122-1BF40-1AA0 — Contactors

Siemens 3RH2122-1BF40-1AA0 SIRIUS Auxiliary Contactor

MPN3RH2122-1BF40-1AA0
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Siemens SIRIUS 3RH2122-1BF40-1AA0 auxiliary contactor, size S00, 2 NO instantaneous contacts, 110 V AC coil, screw and snap-on mounting on 35 mm DIN rail, 45 x 57.5 x 73 mm.

StockContact for availability
Lead timeIn Stock wk
MOQ1 pcs
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
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Specifications

Identification

3RH2122-1BF40-1AA0 — Identification
ParameterValue
Contactor frame sizeS00

Ratings & Performance

3RH2122-1BF40-1AA0 — 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

Control & Coil

3RH2122-1BF40-1AA0 — Control & Coil
ParameterValue
Control supply voltage typeDC

Contacts & Poles

3RH2122-1BF40-1AA0 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)

Connection & Mounting

3RH2122-1BF40-1AA0 — 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 DIN rail

Durability

3RH2122-1BF40-1AA0 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000

Environmental

3RH2122-1BF40-1AA0 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m

Mechanical

3RH2122-1BF40-1AA0 — Mechanical
ParameterValue
Width45 mm
Height57.5 mm
Depth73 mm

Specifications

3RH2122-1BF40-1AA0 — Specifications
ParameterValue
At AC10 000 1/h

Product details

Contact ratings and switching capacity

The 3RH2122-1BF40-1AA0: This contactor carries 2 normally open instantaneous contacts, rated for switching across a wide voltage range. Higher voltages like 690 V still allow 1 A, making it suitable for mixed-voltage control circuits. Coil is 110 V AC rated, with a closing power draw of 4 W DC and the same holding power.

MPN
3RH2122-1BF40-1AA0