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What is the meaning of S303 in part number ATV28xxxxS303.

ATV28xxxxS303 means: Specific control card with positive and negative logical, Potentiometer integrated. 
Note, ATV28HU72N4S303 can be replaced by ATV312HU40N4. 
For ATV312, positive or negative logic does not play role, because ATV312 is appropriate for both polarities using logic input configuration switch (positions "Source", "CLI" or "Sink"). 
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