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Siemens 3RH2122-2BG40 — Contactors

Siemens SIRIUS 3RH2122-2BG40 Auxiliary Contactor, Size S00,

MPN3RH2122-2BG40
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Siemens SIRIUS auxiliary contactor, size S00, 2 NO instantaneous contacts, screw and snap-on mounting on 35 mm DIN rail, 73 mm depth, 45 mm width.

$24.13Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RH2122-2BG40 — Identification
ParameterValue
Contactor frame sizeS00
3RH2122-2BG40 — 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
3RH2122-2BG40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RH2122-2BG40 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH2122-2BG40 — Connection & Mounting
ParameterValue
Conductor cross-section, solid or stranded2x (0,5 ... 4 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 2.5 mm²)
Mounting methodscrew and snap-on mounting onto 35 mm DIN rail
3RH2122-2BG40 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RH2122-2BG40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RH2122-2BG40 — Mechanical
ParameterValue
Width45 mm
Height70 mm
Depth73 mm
3RH2122-2BG40 — Specifications
ParameterValue
At AC10 000 1/h

Product details

Switching capacity and contact duty

The two NO contacts are rated for 10 A at 24 V AC and 230 V AC, 4.7 A at 60 V AC, 3 A at 110 V AC and 400 V AC, 1.2 A at 220 V AC, and 0.5 A at 440 V AC. At 690 V AC the rating is 1 A. These values define the resistive load curve; for inductive or DC loads, derate per the manufacturer's application guidelines. The contactor switches at up to 10,000 operations per hour, with an arcing time of 10 to 15 ms and a DC switching duration of 7 to 13 ms.

The 73 mm depth and 70 mm height fit within the S00 envelope, leaving room for adjacent devices on the same rail.

Coil and environmental ratings

The DC magnet coil draws 4 W closing power and 4 W holding power. The device is rated for degree of pollution 3 and relative humidity minimum 10 %. Substance prohibitance date is 10/01/2009, indicating RoHS compliance from that date.

Frequently asked questions

Where can I buy 3RH2122-2BG40 and how do I get a price?

This part is sourced and quoted to order against an RFQ through independent distribution. Submit an RFQ to receive current pricing and availability confirmation.

What is 3RH2122-2BG40's listed depth and width?

The depth is 73 mm and the width is 45 mm, fitting the S00 frame size.

What compliance documentation is available for 3RH2122-2BG40?

The substance prohibitance date of 10/01/2009 indicates RoHS compliance from that date. The product is part of the Siemens SIRIUS series, which typically provides IEC, UL, and CSA certifications; specific documentation is available upon request.

MPN
3RH2122-2BG40