What does the "X" mean on the ATV61H***M3X?

Issue :
Wondering what does the "X" mean on the ATV61H***M3X?

Product Line :
Altivar Machines, Altivar 61, Altivar 71

Environment :
All models and serial numbers

Cause :
Comparing the ATV61H***M3X with the ATV630****M3

Resolution :
The M3X is a 240V rated drive.
The "X" means that the product does not contain an EMC filter.
The EMC filter is standard for our 480V rated units.

Released for:Schneider Electric USA