We do not currently carry the BV302S12010-ZU power transformer from Zettler Magnetics, in fact other than its use on other distributor sites I wasn’t able to find this part number or any indication of what the ZU in the part number stands for. The datasheet links on the other sites all go to the same datasheet we have for BV302S12010 (3388-BV302S12010-ND). On the Zettler Magnetics website I was only able to find the BV302S12010 I was unable to find BV302S12010-ZU.
With that being said I believe the two part numbers refer to the same part BV302S12010, but if not, they do have similar specifications. Please review the datasheets to ensure the alternative will work for your application