Wylex fuseboxes with rewireable or cartridge fuses are very common in older properties. Plug in MCBs can be obtained for these, and are simple to install.
However doing so is a waste of money, since the MCB does not offer any additional protection compared with a fuse.
Both devices disconnect the power in the event of an overload or short circuit.
The only advantage of the MCB is that is is quicker to reset - but fuses should fail almost never, and if fuses require replacement often, there is some other problem which no replacement device will fix.
New consumer units will contain one or more RCDs, which will disconnect the power in the event of an earth fault, such as someone touching a live wire.
It is impossible to fit these into old fuseboxes like this.
It would be possible to add an RCD separately before such a fusebox, and there are some installations where this has been done. However adding an RCD in this way does not comply with BS7671, as in the event of a fault on any of the circuits, the entire installation will be disconnected and will remain that way until the fault is located and repaired.
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