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Siemens 3RH1122-2WB40 — Contactors

Siemens 3RH1122-2WB40 SIRIUS Coupling Relay, 24 V DC, 10 A,

MPN3RH1122-2WB40

Siemens SIRIUS coupling relay, 3RH1122-2WB40, for switching auxiliary circuits, 24 V DC coil, 10 A rated current, size S00, screw and snap-on mounting, IP20 front.

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

3RH1122-2WB40 — Identification
ParameterValue
Contactor frame sizeS00
3RH1122-2WB40 — 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 V6 A
Rated value @ 24 V10 A
Rated value @ 110 V1 A
Rated value @ 220 V0.27 A
3RH1122-2WB40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RH1122-2WB40 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH1122-2WB40 — Connection & Mounting
ParameterValue
Conductor cross-section, solid2x (0.25 ... 2.5 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.25 ... 1.5 mm²)
Mounting methodscrew and snap-on mounting
3RH1122-2WB40 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
3RH1122-2WB40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RH1122-2WB40 — Mechanical
ParameterValue
Width45 mm
Height60 mm
Depth73 mm

Product details

The Siemens 3RH1122-2WB40 is a SIRIUS coupling relay, size S00, designed to switch auxiliary circuits in control panels.

Switching capability and contact reliability

Two instantaneous contacts (NO/NC configurable per the wiring diagram) handle the auxiliary switching. The relay is rated for 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, and 1 A at 690 V — derate as voltage climbs.

Environmental and electrical robustness

IP20 on the front keeps fingers and tools out — standard for panel-mount gear. The coil draws 1.4 W closing and holding (DC), so no thermal derating headache in a dense row. Shock tested to 10g / 5 ms and 5g / 10 ms, and operating temperature spans -25 to +60 °C.

The built-in varistor surge suppressor (across the coil) means you don't need an external flyback diode for DC switching, which simplifies BOM and panel wiring. RoHS compliance date is July 1, 2006, and the part carries Siemens SIRIUS branding with full traceability through the authorized channel.

Frequently asked questions

What is the closest functional second-source for 3RH1122-2WB40?

The 3RH2122-1WB40 is a peer in the same SIRIUS coupling-relay family, but it uses a different coil voltage (not 24 V DC) and has a different contact arrangement — verify the coil and contact configuration before substituting. The 3RH1122-2WB40 is the 24 V DC variant with a built-in varistor.

Will 3RH1122-2WB40 drop into a panel specified around 3RH2122-1WB40 without rewiring?

The mounting footprint and terminal layout are the same SIRIUS S00 size, so it physically fits the same DIN-rail position. However, the coil voltage and contact configuration differ — check the 24 V DC coil and the 2-contact arrangement against the original spec before committing.

MPN
3RH1122-2WB40