This is a standard sized glass fuse like what cars used before the 80s. I can faintly make out 20A, but I’m not sure what to call it in order to find a replacement. The fuse in the picture has not blown, but it is the only one I have. I don’t think it matters, but this happens to protect a transformer for a pool salt generator.
I’m also interested in what purpose the spring serves. I’m sure I can find another 20A fuse, but I’m not sure I can find one exactly like this, so I’d like to know why it is special.
Best Answer
20 amp glass cartridge type slow blow. It has a thermal mass that generates a delay before the solder melts at the left hand end. The spring pulls the mass away from the wire, making sure the two conductors separate and stay separated.