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What is the different between suffix N4 and S6 of the ATV320 drive?

Different between suffix N4 and S6 of the ATV320 drive

Product Line:
Altivar ATV320

All serial numbers

Customer is looking for a replacement for ATV320U22S6, and wanted to know if he can use ATV320U22N4. 

The ATV320U22S6 has 575V 3 phase input voltage, and the ATV320U22N4 has 460V 3 phaes input voltage.  Customer needs to verify the correct 3 phase input voltage to order the correct part number for the ATV32,0 even though they are the same HP. 
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