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What is the A Suffix mean at the end of an ATV31 drive part number?

Issue:
What is the A Suffix mean at the end of an ATV31 drive part number?
Product Line:
Altivar 31 ATV31

Environment:
All

Cause:
Drive part number omits the A suffix.

Resolution:
The ATV***31A has the start/stop button, run button, and a potentiometer on the front of the drive. The ATV***31 without the "A" at the end of the part number does not have the start/stop, run, and potentiometer on the front of the drive.
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