At 415/440 V that figure holds at 121 kA, still comfortably above typical industrial service-entrance fault levels.
The 63 A frame is the deciding spec for BOM fit — if your load calculation lands at 60 A or below, this breaker lands squarely. The 756 A maximum/minimum figure in the spec table is the short-time withstand or instantaneous magnetic trip threshold, not the continuous rating; don't mistake it for the frame size. The undervoltage release (UVR) is factory-fitted on this variant, so if your safety circuit requires a UVR to drop the breaker on loss of control power, this order code saves a field-install accessory. The UVR release design is built into the supplied basic switch 3VA21635HN360AA0.
Footprint is 105 mm wide, 181 mm tall, 86 mm deep — standard 3-pole MCCB envelope for a 63 A frame. Power loss is 6.5 W maximum — negligible for thermal budgeting inside a crowded cabinet.