It appears to be a broiler, or what folks in the restaurant trade would call a salamander. Typically used for melting cheese on top of things or giving them a nice browned crust. The wire rack underneath the broiler pan is likely for warming, or for holding deeper/taller bakeware for broiling (you'd remove the broiler pan to make room).

US combination ranges (oven and stovetop in one unit) will often have a warming drawer or broiler underneath the oven, where it simply reuses the oven's heating element.