Since I see this thread come up from time to time, after SEMA, I'll check with R&D to see what they say about UV protection. There is only so much UV protection any product can provide. Just as important as protecting against UV rays is keeping the surface cleaned & conditioned. Because most people don't pre-clean their vinyl with a dedicated cleaner like Meguiar's #39 Vinyl Cleaner, in order to prevent coating over the dirt with a product that offers no cleaning ability, product like #40 do contain a light chemical cleaner. This is a benefit to the user as it cleans dirt from the surface versus sealing it in.
I can't think of a single detail I've ever done when I've worked on vinyl with the #40 that I didn't turn my white terry cloth towel over to see dirt the #40 removed from the vinyl.
For brand new vinyl, or pre-cleaned vinyl, then a protectant without any cleaning ability would be just fine.
Mike