So, I hooked up my new server to update the bios and check some settings, thankfully it didn't go down until after I was done that, but suddenly the entire server rack lost power, and this happened once before but without the new server in.
The breaker on the power bar tripped, and this is a 15 amp breaker. After it cooled down and I was able to reset it, I measured the current draw, and the rack with new server was only drawing a max of 7 amps, it's usually around 5.
It seems to me that the breaker has gotten pretty weak, I'm just wondering if that is in fact a thing, or if I should look for some other cause, though I can't think of anything.
This is a second hand power bar, so it may have been tripped many times before, maybe causing the mechanism to become more sensitive?
It's a larger version of the one in the pictures below. Looking for a replacement breaker now, hopefully, though doubtfully, the local electronics shop will have something compatible. edit: They do! I'm going to pick up two of them to replace both of the old ones if this is the case.
I also have to manage to get the darn thing out lol. edit2: oh man these things, unlike most panel mount ratchet things, are an absolute pleasure to remove.