Based on the same design as the Wylex fuseboxes, this has a single 60A fuse.
60A, 240V, 50Hz. Cat. No. 108.
Made in England, BS5419:1977.
Utilisation category AC21 (Switching of resistive loads).
This example was used in the common area of a block of flats, and controlled the supply to a single flat (apartment).
The fuse is a cartridge type, 60A.
Inside, the main switch is the same design as used in the smaller fuseboxes, with the supply terminals at the top. Since there is only one fuse, the neutral connection is a single terminal directly below the switch, rather than the horizontal bar used in the other fuseboxes.
The fuse connections are a heavy duty type with additional spring contacts. The outgoing line wire connects to the top terminal.
A small earth terminal is provided at the bottom right - this originally had two screws, one of the screws is missing.
The two metal pieces clamp onto the fuse and form the blades which fit into the fusebox terminals.