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What is the meaning of S303 on ATV28HU41N4S303.

ATV28...S303 means that ATV28 contains specific control card with positive and negative logic, potentiometer integrated. 
And it is possible to replace it by ATV312 because ATV312 is appropriate for both polarities using logic input configuration switch (positions "Source", "CLI" or "Sink"). 

So, Substitute for ATV28HU41N4S303 is ATV312HU22N4.
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