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Customer has ATS48 part number with the suffix U.
ATS48, Altistart 48
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).