Does not look like anything special to me, just an electrical controls cabinet which you can probably find on Amazon or a local electrical supply.
Bud Industries is one US manufacturer that has been around a long time and makes quality products. Hoffman is another source. There are many others, but this should get you started and you can expand your search from there.
You might also search places like CraigsList for used cabinets. You’d be surprised what is out there for much less than new but is in almost new condition. You might end up stripping out some old components you don’t need. but you may gain some items like DIN rails and save yourself some money.
Vendors like DigiKey, Newark Electronics, and McMaster-Carr will have what you need to name just three. Their prices are not always the least expensive, but they usually have items in stock.
Almost all this stuff will be available on Amazon, but sometimes the quality is questionable so beware and read the reviews.