Questions regarding physical fuses. Fuses are a safety device consisting of a strip of wire that melts and breaks an electric circuit if the current exceeds a safe level.
Also known as a fusible link, a circuit element that is designed to fail when the fuse rating is met or exceeded. It works on the principal of heating a precisely thinned piece of metal as the current flows through it. The higher the current the faster it "blows". Fuses typically are low resistance until they blow and then they form a "open" - an unconnected circuit. They usually come in two varieties slow blow and fast blow.
PPTC, PTC, and Polyfuse questions should use the polyfuse Tag.
Please keep in mind that repair questions are typically closed if not within the scope of the Site and FAQ.