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What is the S suffix on the ATV212HD22N4S drive?

 
The S suffix is for "Slim Version" of ATV212HD22N4S. The dimensions are
less than a standard ATV212HD22N4. That s why (due to the dimensions of
the product) the switching frequency is 6kHz in continuous operation at 40°
C. You have also more details about the derating on page 32 of
Installation manual of ATV212.

The power dissipated at nominal current on HD22N4S is greater than HD22N4
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