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Why is the part number VY1ADA604 replacement transformer for the ATV66 smaller than the original one if this is the correct part number?<br />

The smaller transformer used to be in the size 5 drive before 1999 and then they went to a bigger transformer to include 460V 50hz applications. However, the smaller transformer does work when drive is being used in the US with 460V 60hz power.
For replacement the VY1ADA604 can be used in all Altivar 66 drives from ATV66D33N4 to D79N4.
The original transformer has part number W813650660111A01 and the smaller replacement transformer has part number W803849980112/03.

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