Just so every one understands the reasons why this happens in the first place and that its' not a 100% guaranteed fix since other component may have not survived the blow.
This fuse is protecting the head driver output devices and print head from catastrophic failure, however it's not 100% effective at doing so. Without the fuse protecting this circuit its could take out every thing along its path...not very pretty and could be prone to fire....there is a saying in the engineering world that is "don,t let the smoke out".
There is a chance that the short (usually liquid migrating into the print head connector) may still exist in the print head cable that would need to be replaced.
There is also a chance that the fuse did not act fast enough and damaged the output devices or print head, but not as common.
If this is the case the fuse will not fix the problem and the board will need to be replaced.
If the print head cable checks out OK and the output devices survived, then the addition of the external fuse should bring it back to life.
If it ever happens again then its easy to change the fuse, and extra one/s will be provided with the modification that hopefully you will never need....
Under no circumstance put a different value fuse other then the one/s provided.