Question

what is the main fuse​

Answer 1

$\: a \: main \: fuse \: is \: a \: safety \: device \: which \: protects \: the \: circuit \: when \: over \: current \: flows$

Hope it helps.

More about:

$it \: is \: made \: up \: of \: copper \: wire \: in \: most \: cases \: and \: has \: a \: low \: melting \: point$

Answer 2

Hey Buddy !☺☺

A main fuse is a fuse which is Connected in series with the electric circuit at its starting point, due to which it prevents the flowing of electric current if it reaches to an extent which is beyond the rated Current of Electric Circuit by breaking the circuit because of its melting.