With S3 GT-I9305 (LTE), the part is not working. Did not think that it makes a difference. The phone has the docking station as a "connected to computer" interpreted but not loaded or it at least does not appear.
(Is a software / firmware thing of the station because the charger cable invites course properly.)
Have now bought the same / similar model for explicitly GT-I9305 and it is working properly and also indicates the charging process.
So just be careful! Hope this saves some of the possibly bad buy.