The VW3A66825 is a vent fan kit Schneider designed specifically for Altivar ATV66 size 5 variable speed drives — the D54N4 through D79N4 and D46M2 frames.
What it fits and why that matters
This fan kit is specific to the ATV66 size 5 enclosure. If you're maintaining an ATV66 installation that's still running, the VW3A66825 is the factory-matching service part for that chassis. The 24 V DC supply means it taps into the drive's own control voltage — no separate power supply needed, just a terminal connection inside the drive bay.
