A plastic case fusebox with four rewireable fuses.
The cover just clips into place, no tools required to remove it.
The four fuseways are marked 13A SOCKS, LIGHTS, IMERSION, COOKER.
Hopefully that really means 13A Sockets, and they actually meant to spell IMMERSION heater properly.
The front cover is secured with two screws, which can be seen either side of the row of fuses.
Fuses shown from left to right are 30A, 5A, 15A, 30A.
The fuses and bases are colour coded - red for 30A, blue 15A, white 5A. The other 20A type not shown here were yellow.
Fuse shields are fixed with a single screw.
The earth bar is at the top left.
The oval MEM logo is also included.
A label inside warns that unused ways must be covered with a blank shield 00 QLS.
This particular box had all four circuits in use, so this part was not required.
Any of the three types could be fitted, with circuit breakers (MCBs) being the least common as they were the most expensive choice.
While these are still permitted and are perfectly servicable, they are very easy to misuse.
Typical issues include the wrong fusewire being fitted, fusewire being fitted incorrectly, or other types of wire being shoved in.
The fuse here is 15A, colour coded blue.
The contacts behind each shield are identical, so that any rating of device can be installed in any position.
This is to make installing the unit easier - the backplate can be fixed and wiring drawn in without the chassis in place.
Note the fuseway 2nd from left has significant burning damage. This was the 5A lighting circuit, which in this particular property had several severe cable faults which caused the fuse to blow on a regular basis.
The incoming terminals on the switch are recessed to reduce the possibility of fingers or other objects contacting them - both the screws and terminals are live even with the switch in the off position.