Fuse is a short piece of metal, inserted in the circuit, which melts when excessive current flows through it and thus breaks the circuit.
It is inserted in series with the circuit to be protected, under normal operating conditions, the fuse element is at temperature belows its melting point.
Therfore, it carries the normal current without overheating.
however, when a short-circuit or overload occur, the current throught the fuse increase beyond it rated value. This raises the temperature and fuse element melts (blow out), disconnecting the circuit.
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