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What is the difference between ATV61-S387 and ATV61drive.

The difference between an ATV61-S387 and a standard ATV61 is just the firmware.
S387 is a special firmware for step-up solutions with transformer at the output of the drive.
The hardware is exactly the same. Example: ATV61HC22N4D387 = ATV61HC22N4D (=ATV61HC22N4 without DC choke box).
 
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