The Siemens 3RW4928-8VB00 is an auxiliary cooling fan module specifically engineered for
the SIRIUS 3RW40 soft starter series, particularly for size S0 devices. This fan enhances heat dissipation and
ensures optimal thermal management during high-duty cycles or in environments with elevated ambient temperatures.
Frequently Asked Questions About 3RW4928-8VB00
1. Why add the fan?
Installs extra cooling to enhance heat dissipation. Recommended for installations with
frequent motor starts or elevated ambient temperatures to maintain performance and extend soft starter life.
2. Is it standard with 3RW402/404?
No—3RW402 series require ordering this fan separately. 3RW403/404 use 3RW4947‑8VB00,
while later models (3RW405‑407, 3RW446) have built-in fans.
3. How does fan operation work?
It auto-starts when the soft starter switches to built-in bypass after motor start,
continues running for 30–60 minutes after stop command, and shuts off if the control power is interrupted.
For older series (E≤04), fan runs continuously upon power-up; newer (E≥05) versions turn off ~30 min after last start.
4. Is it easy to install yourself?
Yes. It's plug-and-play with no extra wiring. Prior to installation or replacement,
ensure all supply power is fully disconnected—operation by authorized personnel only.
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