Fuses in general

My glider has multiple batteries with a switch to change between them
during flight. To, hopefully, eliminate loss of logger data during the
brief interruption of power during the switching process there is a large
capacitor to ensure continuity of supply to selected instruments during
switching. Although there is a resistor to limit the inrush current to
the capacitor this type of circuit needs a slow-blow fuse. (Factory wired
in last two years.)