I opened up an older Legacy brick, one that came with a #993 expansion set. All I found was a fuse in one leg of the secondary, it was a pretty robust fuse. The markings weren't all that clear, so I torture tested it with a 10A current controlled bench supply. It took around 9 amps to pop it. I replaced it with a 2A hold, 4A trip PTC and buttoned it back up. I won't ever have to open that one again...
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