Fuse is in the form of series in circuit. When occurs short circuit or overload, its metal filaments or sheets which are made of a special metal will generate a lot of heat energy as a result of large current, causing the metal filaments or sheets to skyrock in temperature. Once the temperature is up to melting point, the metal filament or sheet will cut off, electrical power will be cut off correspondingly so as to protect the circuit or the machine.
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