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Siemens 3RH1921-1KA02 — Contactors

Siemens 3RH1921-1KA02 SIRIUS Auxiliary Switch, 10 A AC-12, s

MPN3RH1921-1KA02
Active

Siemens SIRIUS auxiliary switch, 3RH1921-1KA02, for S0 contactors, 10 A AC-12, 6 kV surge, IP20, screw terminals, snap-on mounting.

Siemens 3RH1921-1KA02 datasheet (PDF)
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

3RH1921-1KA02 — Identification
ParameterValue
Contactor frame sizeS0
3RH1921-1KA02 — 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
3RH1921-1KA02 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH1921-1KA02 — Connection & Mounting
ParameterValue
Conductor cross-section, solid or stranded2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Mounting methodsnap-on mounting
3RH1921-1KA02 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
3RH1921-1KA02 — Mechanical
ParameterValue
Width10 mm
Height80 mm
Depth71 mm

Product details

It adds one normally-open mirror contact per IEC 60947-4-1, rated for 10 A in AC-12 duty and carrying a 6 kV surge voltage rating. The 10 mm width means it tucks into a tight DIN-rail row without crowding adjacent devices.

Snap-on mounting to the contactor's front or side; a second unit can be mounted laterally, so you can stack two auxiliary blocks on one S0 base without extra brackets. Screw-type terminals accept 2x (0.5…1.5 mm²) solid or 2x (0.75…2.5 mm²) stranded, or 2x (20…16) and 2x (18…14) AWG. Strip length is standard for the terminal — no special tooling needed.

Frequently asked questions

What is the width of 3RH1921-1KA02?

10 mm wide, which fits the S0 contactor profile and allows lateral stacking of a second block.

What compliance documentation is available for 3RH1921-1KA02?

RoHS compliance with a substance prohibitance date of 07/01/2006, IP20 protection on the front, and a 6 kV surge voltage rating. The mirror contact meets IEC 60947-4-1 requirements.

MPN
3RH1921-1KA02