Panel mount fuse holders.

I use 1/4"x1 1/4" fuses (AG3 in fast blow) for long term availability, also stocked at local auto supply without a freight bill.
The littlefuse & buss panel fuse holders from distributors are fine. They fit in a D shaped hole, so I drill undersized then finish out the hole with a rat tail file. A real file from nicholson, not some import toy.
Where taking the cover off is not a **** , fuse clips that mount inside are easier to machine, requiring 1 or 2 holes to be drilled for #6 screws. My projects are checked out on a light bulb box and don't often blow fuses.
 
@Vovk Z: You are right saying Fuse size is dependent on maximum breaking capacity or reliability. It's more a pratical design rule based on general holder capacity and under sizing for security (intensity vs contact size, fire...).

By the way, I also prefer a slow blow fuse before a transformer.
 
As I know there isn't such a strong dependance between a rated current and a fuse size. Fuse size more dependent on maximum breaking capacity or reliability (under large currents/voltages).
Correct. 5x20 (mm) are the ones distributed in the metric market, 1/4" x 1 1/4" are for the US market, also for some Europeran automotive. I have 5x20's in 10 A slow blow, for instance.
Best regards!
 

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