Pretty much every PSU I've ever seen has been electronically protected (I think the newest PSU I've had that had a Glass fuse was for a 386 AT box).
The most common thing this applies to is when we overclockers/modders short circuit the PSU wires and you have to wait 30 secs for the PSU to start again, I did this to an old one and the glass fuse EXPLODED quite violently, killed some components (in the psu) too.
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