If the circuit is drawing too much current due to failed components then before putting in the new fuse and causes more damages you should at least check out the circuit first or you can take a chance and install a new fuse.
I thought fuses are used to prevent damage to critical components
No, the most critical (and expensive) components are there to protect fuses.
Sometimes a fuse will protect other parts that haven't blown, sometimes not.
Fuses are mostly there to try to stop everything going up in flames when really bad things happen.
Photos would be a good start
"Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
-David VanHorn
Comment