The Mitsubishi FR-A840-00083-2-60 is a 2.2 kW inverter drive rated for 6 A on a three-phase 400/415V AC supply. It's the kind of box you'd put on a small conveyor pump or a fan motor in a clean indoor panel.
What the ratings mean for your install
At 6 A, that's roughly 2.2 kW on a standard 400V feed. The IP20 enclosure means it wants to live inside a cabinet, not out in the weather or where dust and cutting oil fly. Keep the gland plate sealed and the panel clean, and this drive will do its job.