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.
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.