Would you have a “snap-in” fuse holder similar to a CB such that circuits could be added by installing the appropriate fuse-holder in a panel’s empty slot?
We have such panels in Britain. In fact, in many ranges the same panel will accept either breakers or fuse carriers, so there's nothing to stop you fitting a mixture of both.
Fuses often have the edge on interrupt ratings, and under our wiring rules can be used to "protect" a C/B which would otherwise have too low an interrupt rating. For example, the typical domestic C/B is rated 6kA interrupt, which could be exceeded in many locations close to a sub-station, however the cartridge fuse used in the main service will have a much higher rating and will blow should a C/B be unable to break a dead-short condition.
