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Siemens 3RH1921-2DA11 — Contactors

Siemens 3RH1921-2DA11 SIRIUS Auxiliary Switch, 10 A, 24 V, s

MPN3RH1921-2DA11
Active

Siemens SIRIUS auxiliary switch, 3RH1921-2DA11, first laterally mountable, snap-on for S0 contactors, spring-loaded terminals, 10 A at 24 V, IP20 front.

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

3RH1921-2DA11 — Identification
ParameterValue
Contactor frame sizeS0
3RH1921-2DA11 — Ratings & Performance
ParameterValue
Rated value @ 24 V10 A
Rated value @ 60 V4.7 A
Rated value @ 110 V3 A
Rated value @ 220 V1.2 A
3RH1921-2DA11 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH1921-2DA11 — Connection & Mounting
ParameterValue
Conductor cross-section, solid or stranded2x (0.5 ... 2.5 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 1.5 mm²)
Mounting methodsnap-on mounting
3RH1921-2DA11 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
3RH1921-2DA11 — Mechanical
ParameterValue
Width10 mm
Height72.5 mm
Depth71 mm

Product details

The Siemens 3RH1921-2DA11 is a SIRIUS auxiliary switch designed for lateral snap-on mounting to S0-frame contactors and contactor relays. It adds one instantaneous normally-open contact to the switching block, letting you pick up status feedback or interlock signals without extra wiring layers. Rated for 10 A at 24 V (AC-12) and 6 A at 24 V for general-purpose switching, with derated curves up to 400 V at 3 A. The spring-loaded terminals accept 2x (0.5 to 2.5 mm²) solid or stranded, or 2x (20 to 14 AWG) — no screwdriver needed for the control-circuit connections.

The 3RH1921-2DA11 is listed as current production.

Frequently asked questions

Will 3RH1921-2DA11 drop into a panel that was specified around 3RH2122-2AV60 without rewiring?

No — the 3RH2122-2AV60 is a different frame size (S2/S3) with a different mounting footprint and terminal layout. The 3RH1921-2DA11 is sized for S0 contactors only and will not mechanically fit an S2/S3 panel cutout without adapter hardware.

MPN
3RH1921-2DA11