On 29/12/2019 13:01, Scott wrote:

I appreciate that the fuse is intended to protect the lead not the
appliance, but surely there is a side-effect of protecting the
appliance? Is there any benefit in fitting a fuse significantly
larger than needed? Common sense suggests go for maximum protection.

In the event of an internal fault in an appliance containing electronics
then the chances are that one of the components will release its smoke
and permanently disable the appliance much faster than the 'correctly'
rated fuse would blow. So not much point in trying to protect anything
except the lead.