Comment by bradfa

SELV usually is defined to have both a voltage limit and a volt-amp (ie: power) limit. Generally defined somewhere around 60V peak to peak and 250V*A.

48V is under the SELV voltage limit, even with some margins.

But historically, some countries have had lower limits. I recall Japan being one of them for a while. I'm not confident that SELV is a harmonized standard worldwide, or at least it wasn't until recently, if it is now.