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Fuse blows but doesn't!


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Here's an interesting thing. Blew a fuse the other day while fettling some electrics on the 110. Distinctly heard it go 'pop'. But when I checked I still had 12v output. So I carried on sorting out, took the car for a drive only to find the circuit would only operate intermittentley. So went back home and checked through everything.

That's when I found that although the fuse had blown it had failed in such a way that it reconnected. Driving along caused the circuit to jiggle open and then closed again. You can see in the photo a slight blackening of the fuse and that the wire has 'slumped'.

It's a funny old world!

 

20210629_194656.jpg

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I've seen the same with light bulbs where the filament had broken but was still making contact and thus working. At least until you hit a bump. Then it would need a friendly tap to light up again. 🙂

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