Use some or all of the following terms in your search: 'metal clad', '4 gang', 'socket' possibly with the addition of 'industrial'.
It would help greatly if the photograph allowed us to read the text on the RCD in the centre.
A similar, modern, domestic version can be seen at Screwfix 3241F. This is eight gang, but it gives a manufacturer, BG, and Schneider, another manufacturer, pops up in the sidebar.
You will need to look through the catalogues of mainstream, name-brand electrical manufacturers for further inspiration.