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The operation of a little fuse is straightforward yet highly effective. Inside the fuse, there is a conductive strip made usually of metal, which is designed to melt at a specific current rating. For instance, if a circuit is designed for 5 amps and the current exceeds this threshold due to a fault or overload, the excessive current heats the metal strip until it melts. This interruption effectively protects the rest of the circuit and connected devices from damage.


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