Question

What is the reason of melting fuse to protect circuit...

Answer 1

When the excessive current flows from the circuit it can cause short circuit but when fuse is inserted in circuit it breaks itself to prevent the short circuit.
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Answer 2

as we know that the heat produced in a conductor is directly proportional to the sqaure of current passing through it . when higher current passes through conductor , fuse gets heated ,as a result it melt it down due to low melting point and due to fusion of fuse wire

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