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Siemens 3RV1902-1AF0 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV1902-1AF0 SIRIUS Undervoltage Release, 110VAC/50H

MPN3RV1902-1AF0

Siemens SIRIUS 3RV1902-1AF0 undervoltage release, 110 V AC at 50 Hz / 120 V AC at 60 Hz, snap-on mounting for circuit breaker sizes S00, S0, S2, S3.

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

3RV1902-1AF0 — Identification
ParameterValue
SeriesSIRIUS
Product designationundervoltage release
Frame sizeS00, S0, S2, S3
3RV1902-1AF0 — Electrical
ParameterValue
Rated insulation voltage (Ui), pollution degree 3690 V
3RV1902-1AF0 — Mechanical
ParameterValue
Height90 mm
Width18.5 mm
Depth68 mm
Mounting methodsnap-on mounting
3RV1902-1AF0 — Environmental
ParameterValue
Operating temperature-20 ... +60 °C
Storage temperature-50 ... +80 °C

Product details

The Siemens SIRIUS 3RV1902-1AF0 is an undervoltage release designed for use with SIRIUS 3RV motor circuit breakers in sizes S00, S0, S2, and S3.

This part is explicitly marked as a phased-out product. The official Siemens successor is the SIRIUS 3RV2902-1AF0, which is the preferred replacement type. If you are filling a BOM line or a panel that was specified around the 3RV1902-1AF0, the 3RV2902-1AF0 is the drop-in cross-reference to target.

Depth is 68 mm, height 90 mm. It is designed for use with the SIRIUS 3RV motor circuit breaker family; the release mechanically couples to the breaker's trip mechanism, so no auxiliary contacts are needed for the trip function itself (the release has zero NO, NC, or CO contacts).

Environmental and electrical ratings

The control supply voltage is AC only — no DC variant here. The reference code per EN 61346-2 is F, classifying it as a protective device.

Frequently asked questions

Where can I buy 3RV1902-1AF0 and how do I get a price?

We source this phased-out part to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time.

What is the closest functional second-source for 3RV1902-1AF0?

The official Siemens successor is 3RV2902-1AF0, which is the preferred replacement type. The 3RH2131-2AK60 is a different class of device (auxiliary contactor) and is not a functional substitute for an undervoltage release.

What is 3RV1902-1AF0's listed depth and width?

Depth is 68 mm, width is 18.5 mm. The 18.5 mm width occupies one standard 18 mm DIN-rail module slot.

Will 3RV1902-1AF0 drop into a panel specified around 3RH2131-2AK60?

No. The 3RH2131-2AK60 is an auxiliary contactor (45 mm wide, screw and snap-on mounting) with a different function and footprint. The 3RV1902-1AF0 is an undervoltage release that mechanically couples to a motor circuit breaker — it is not a panel-level replacement for a contactor.

MPN
3RV1902-1AF0