That 63 A holds flat through 50 °C, then derates to 58 A at 70 °C — so if your panel ambient runs hot, you still get full current up to 50 °C, which covers most enclosed switchgear. The interrupting ratings are the headline: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 500 V and 690 V. Front IP40 — fine for a dry panel, not for washdown.
Width 76.2 mm (3 in), height 130 mm (5.12 in), depth 70 mm (2.76 in). No trip indicator, no voltage trigger, no ground-fault monitoring — it's a straight thermal-magnetic breaker, no frills.