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What is the role of fuse, used in series with any electrical appliance? Why should a fuse with defined rating not be replaced by one with a larger rating?
 
Fuse is used for protecting appliances during . The fuse is rated for a certain maximum current and the fuse wire melts when the current flowing through it  the rated value.
 
The appliance may get damaged, if a fuse is replaced by one with  because the fuse wire will . Therefore, the practice of using fuse of improper rating should always be avoided.