Some dumb questions, but these things sometimes don't work like I imagine they would.

Say I have a 3 amp fuse at the battery and a 1 amp blade fuse in series and the one amp feeds power to a single instrument. (with other 1 amp fuses going to other devices)

Is there a scenario where a 1 amp blows and the 3 amp does not? I figure that most shorts will draw more than 3 amps and blow both fuses. Do devices develop "partial shorts"?

Is there a scenario where both fuses blow?

Would it make sense to make the 3 amp "slow blow" and the 1 amp "normal blow"?

What am I missing?