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Siemens 3RA2921-2G — Motor Starters

Siemens 3RA2921-2G SIRIUS Link Module, S0, Clip-On

MPN3RA2921-2G

Siemens SIRIUS link module 3RA2921-2G, S0 size, clip-on fastening, spring-type terminals, for 3RV2021 and 3RW3.2/3RW402.

Siemens 3RA2921-2G datasheet (PDF)
StockContact for availability
Lead time3-5 Days wk
MOQ1 pcs
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
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Specifications

Identification

3RA2921-2G — Identification
ParameterValue
Product designationlink module
BrandSIRIUS
Circuit-breaker sizeS0

Mechanical & Connection

3RA2921-2G — Mechanical & Connection
ParameterValue
Mounting / fastening methodclip-on

Product details

The Siemens 3RA2921-2G is a SIRIUS link module — the mechanical and electrical bridge between a 3RV2021 motor-protective circuit breaker and a 3RW3.2 or 3RW402 soft starter (or contactor, depending on the build). It clips onto the S0 frame size, so it mates with the 3RV2021's S0 footprint without extra hardware. The spring-type terminals on this module accept the wiring from the soft starter side, keeping the assembly compact inside a panel.

Clip-On Fit and Panel Integration

Fastening is clip-on. The S0 frame size keeps the stack depth consistent with the 3RV2021 breaker.

Frequently asked questions

Is 3RA2921-2G compatible with 3RV2021 circuit breaker?

Yes, the 3RA2921-2G is specifically designed for the 3RV2021 motor-protective circuit breaker in the S0 frame size. It clips onto the breaker and provides the electrical connection to the soft starter.

MPN
3RA2921-2G