I’m truly dumbfounded that the loss of a single fuse could cripple the entire ship. There’s either more to this story, or someone in their naval design bureau needs a good, hard kick in the seat of the pants.
I’m reminded, btw, of a Swiss tank design in the 70s/80s that had a similarly embarrassing electronic problem. The Panzer 68 had several instances where systems shared circuits. This included the heater sharing circuits with the main gun’s fire controls. So, when a crew tried to warm up on a frosty alpine morning at the firing range, the main gun had a tendency to fire of its own accord shortly thereafter.
The only missing part is that SOMEONE wasn't doing their job.
The fuse blew and disabled the ship so that it's 'complicated cooling system' wasn't destroyed. The FUSE was doing it's job.
Whoever and whatever was responsible for adjusting the system due to changes in the sea water temp and air temp, was not.