I have a 12v tyre pump, which has a plug that goes into the car's
lighter socket. The compressor has warnings about not letting it
overheat. But when I pumped an almost-flat tyre up, the compressor was
fine, but the plug died. It had melted inside, and there was now no
contact with the bottom of the 8A fuse.
I purchased a couple of replacements from CPC, and fitted one. It has
worked fine for several months, but yesterday, at the end of a normal
tyre top-up session, there was a faltering of the compressor. I took
the plug apart, and the same fault has occurred. Although the fuse is
8A, the current has to pass through a wire spring, which acts like an
electric fire element, and melts the plastic in which it sits. This may
have been happening a little each time I have used it.
Made in China, if that helps.
I'll be looking for a different brand now, and will tell CPC what I
think of their plug.