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Siemens 3RH1921-1FE31 — Contactors

Siemens 3RH1921-1FE31 SIRIUS Auxiliary Switch Block, 2 NO en

MPN3RH1921-1FE31

Siemens SIRIUS auxiliary switch block, 3RH1921-1FE31, 2 NO encapsulated + 1 NO+1 NC, snap-on mounting for 3RT1 contactors, screw terminals, IP20 front, 0.3 A at 24 V / 60 V.

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

3RH1921-1FE31 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH1921-1FE31 — Connection & Mounting
ParameterValue
Mounting methodsnap-on mounting
3RH1921-1FE31 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
3RH1921-1FE31 — Mechanical
ParameterValue
Width44 mm
Height38 mm
Depth51 mm

Product details

It provides three instantaneous contacts: two normally open (encapsulated) and one normally open plus one normally closed (not encapsulated). Rated at 0.3 A at both 24 V and 60 V, this block handles low-current signaling and control loads common in auxiliary circuits. The screw-type terminals accept solid or stranded wire: 2x (0.5 to 1.5 mm²) and 2x (0.75 to 2.5 mm²), or AWG equivalents 2x (20 to 16) and 2x (18 to 14). Mechanical service life is 5 million switching cycles typical.

Panel Integration

Dimensions: 44 mm wide, 38 mm high, 51 mm deep — fits within the standard S0 to S12 contactor envelope. No additional wiring harness or adapter needed; the screw terminals match the existing control-circuit wiring practice.

Frequently asked questions

Where can I buy 3RH1921-1FE31?

We source and quote this part to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

What does the note 'with 3RT1' mean on this part?

The note indicates this auxiliary switch block is designed for use with Siemens 3RT1 contactor relays and power contactors — it mounts directly on them.

What compliance documentation is available for 3RH1921-1FE31?

The part carries SIRIUS brand documentation including RoHS and REACH declarations. Specific UL, IEC, or other certification details should be verified against the manufacturer's current documentation package.

MPN
3RH1921-1FE31