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Siemens 3RW4957-8VX40 — Soft Starters

Siemens 3RW4957-8VX40 SIRIUS Fan, 230 V AC, for Soft Starter

MPN3RW4957-8VX40

Siemens SIRIUS 3RW4957-8VX40 fan, 230 V AC, for 3RW445/446 soft starters, output-side mounting.

Siemens 3RW4957-8VX40 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RW4957-8VX40 — Identification
ParameterValue
Product designationFan
Product brand nameSIRIUS
3RW4957-8VX40 — Other specifications
ParameterValue
Product categoryFan
Design of the productCan be used for 3RW445. and 3RW446. (for mounting at output side)/230 V AC
Substance prohibitance05/01/2012

Product details

Fan for SIRIUS 3RW445/446 soft starters

The 3RW4957-8VX40 is a SIRIUS fan designed to mount on the output side of Siemens 3RW445 and 3RW446 soft starters with BC4 suffix, running on 230 V AC.

This fan bolts to the output side of the soft starter chassis, drawing cooling air across the power semiconductors during heavy motor-starting duty cycles. The 230 V AC supply taps from the control transformer or a dedicated fan circuit — confirm the voltage matches the soft starter's auxiliary supply before wiring.

Compliance and documentation

As a SIRIUS accessory, the fan carries Siemens standard documentation — the product drawing and installation instructions are available through the Siemens Industry Online Support portal.

Frequently asked questions

What soft starter models does the 3RW4957-8VX40 fit?

It mounts on the output side of Siemens 3RW445 and 3RW446 soft starters with the BC4 suffix, running on 230 V AC.

What compliance documentation does Siemens provide for 3RW4957-8VX40?

Full documentation including the product drawing and installation manual is available via Siemens Industry Online Support.

MPN
3RW4957-8VX40