Skip to main content
Siemens 3RH2122-1BF40 — Contactors

Siemens 3RH2122-1BF40 SIRIUS Auxiliary Contactor, 110 V Coil

MPN3RH2122-1BF40
Active

Siemens SIRIUS auxiliary contactor, size S00, 110 V AC coil, 2 NO + 2 NC instantaneous contacts, screw and snap-on 35 mm DIN rail mounting, 73 x 45 x 57.5 mm.

$21.59Ref. price · indicative, final on quote
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

3RH2122-1BF40 — Identification
ParameterValue
Contactor frame sizeS00
3RH2122-1BF40 — 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
3RH2122-1BF40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RH2122-1BF40 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH2122-1BF40 — 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
3RH2122-1BF40 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RH2122-1BF40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RH2122-1BF40 — Mechanical
ParameterValue
Width45 mm
Height57.5 mm
Depth73 mm
3RH2122-1BF40 — Specifications
ParameterValue
At AC10 000 1/h

Product details

It carries 2 NO and 2 NC instantaneous contacts, rated for a 110 V AC coil. At 24 V AC the contacts handle 10 A resistive; at 110 V AC they switch 3 A, and at 230 V AC they hold 10 A — the 110 V AC rating is the one that governs the coil circuit, while the 230 V AC figure covers the load side for common line voltages.

Mounts via screw fixing or snap-on onto 35 mm DIN rail — the S00 frame width is 45 mm, depth 73 mm, height 57.5 mm. That keeps the panel footprint tight; you can fit several side by side on a standard rail section.

The lifecycle status is current production; it's a standard catalog item from the SIRIUS line, not a phase-out or NRND part. RoHS compliance date is October 1, 2009, covering the EU substance prohibitions.

Wiring and Contact Ratings

Terminals accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm² solid or stranded wire — spring-cage or screw terminals are typical for this series, though the evidence specifies screw and snap-on mounting. The instantaneous contacts are rated for 10 A at 24 V AC and 230 V AC, 4.7 A at 60 V, 3 A at 110 V, 1.2 A at 220 V, and derated at higher voltages: 0.5 A at 440 V, 0.26 A at 600 V, 1 A at 690 V.

Frequently asked questions

What is the closest functional alternative to 3RH2122-1BF40?

The 3RH2122-1AC60 is a functional peer — same S00 frame, same 2 NO + 2 NC contact configuration, but with a 60 Hz coil instead of 110 V AC. The 3RH2131-1AH00 adds a third NO contact (3 NO + 1 NC) and uses a 110 V DC coil. The 3RT6017-1AF01 is a power contactor, not an auxiliary, so it's a different class. For a drop-in replacement with the same coil voltage, stick with the -1BF40 variant.

Where can I buy 3RH2122-1BF40 and how is it quoted?

This part is sourced and quoted to order against an RFQ through independent industrial distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for volume or single-unit pricing.

What compliance documentation does Siemens provide for 3RH2122-1BF40?

RoHS compliance is confirmed with a substance prohibition date of October 1, 2009. The product carries pollution degree 3 rating and is designed to meet IEC/EN standards for industrial control equipment.

MPN
3RH2122-1BF40