Does Nobody Ever Wonder Why a Fuse Blows?

Fuses are mechanical connections and die of their own accord. The old glass fuses could get a bit warm if the connections were not clean and there was a lot of current passing and in turn the inside end connections would melt open leaving you with a perfectly looking fuse that was bad. In my service business we probably have changed over 50 thousand fuses in the last 40 yrs. I would bet over 50% were fuses that just got tired.

Unless you've only got one spare fuse in your inventory, I'd just replace it, and then wait and see. There is no telling what caused the fuse to fail, and it may just be that rare "bad fuse". But, it does indicate that there is some sort of problem, which may or may not happen again.

Typically, I'll just replace or reset the fuse/breaker and see what happens....if it trips again, I'll investigate...if not, I'll continue to enjoy my trip!

Same goes for the GFI outlets. Sometimes it's an issue, but sometimes, it's just that the outlet is getting old, and more sensitive....but you also have to be aware that these are safety aids that may save your life, so don't take them lightly.

A good point is made in the OPs comments....they usually trip for a reason...find out why, before you have an electrical fire, that would surely ruin your trip!

If you replace a fuse and it blows again, check it out. On my front jacks I have overloaded in the past and blew a fuse. It was my fault, the rear stabilizers were down and I needed to raise the front a tad more. That was too much and blew the fuse. Replaced and kept that in mind!

I guess it depends on the fuse... auxiliary fuses tend to blow and are low amp so I don't worry too much about them, and my AC circuit breaker will trip if I'm not ordered about turning things on.

On the other hand, when the thermal fuse blew on my heater I made damn sure I had the heater cleaned out before I replaced it and turned it back on.