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What does the U suffix mean at the end of the ATS48 Softstarts?

Customer has ATS48 part number with the suffix U. 

Product Line:
ATS48, Altistart 48

All models.

To order in the US with English only literature, the part number was changed for a short period of time with the suffix U. 

There is no difference in products ordered with U and without U suffix, the customer will get the same product.
The suffix U is no longer used to order this part number. 

(i.e. ATS48D17YU is the same softstart as ATS48D17Y).

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