The EZ9R8R8DCU is a Schneider Electric Easy9 8+8 way consumer unit (fuse box) commonly used in domestic electrical installations.
Key Technical Specifications

The dual-RCD split board configuration is frequently used in residential properties across the UK to separate upstairs and downstairs lighting and power circuits. This setup prevents a single fault in one part of the house from knocking out all the power (i.e., if one RCD trips, the other side of the board remains operational).
Height 240 mm Width 510 mm Depth 127 mm