The adjustable Ir (44–63 A) lets you fine-tune the overload setting to match the continuous load current, which is useful when the actual load is below the breaker's 63 A In rating. The fixed Ii = 10 x In (630 A magnetic pickup) means the instantaneous trip is not adjustable — verify that this setting coordinates with downstream branch breakers, especially if you have long cable runs or high-inrush loads.
Where it fits in a panel
Terminal connections accept copper or aluminum conductors; torque values are marked on the breaker face. The compact frame width (140 mm for 4-pole) saves panel space compared to older frame sizes.