What the ratings mean for fit
The 3VA1340-5EE32-0AA0-ZD00: The TM220 trip unit gives thermal-magnetic protection: overload (Ir) adjustable from 280 A to 400 A via a dial on the front, and a fixed magnetic short-circuit pickup (Ii) of 10 x In, so 4000 A. That's a steep magnetic setting — typical for motor or transformer feeders where you need to ride through inrush without nuisance tripping. The 3VA1 frame is compact for 400 A; it mounts on a standard DIN rail or panel-mount plate, and the nut keeper kit (the -ZD00 suffix) is a Chinese OEM add-on that holds the terminal nuts captive during assembly — saves time on a panel line.