I'm looking at a pretty simple overvoltage/transient protection circuit designed to protect users but I don't understand what the transformer is doing.
The circuit is designed to protect the output from seeing mains or transients generated by mains (2kV+) as the output is technically user accessible.
What I don't understand what the transformer does given its a 1:1 ratio. Surely the mains/transients will get to the output before the fuse blows?
Extra: From my own reading online, it looks like it provides galvanic isolation, but I still don't understand the concept of this keeps a user safe.