Interrupting capacity and what it means on site
The 3VA2463-5HN32-0AF0: The interrupting rating is the headline: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 9 kA at 690 V.
Thermal derating — the number that actually governs your load
The 630 A continuous rating is at 40 °C ambient. In a hot panel — say 50 °C — the breaker carries 593 A; at 60 °C it's 557 A; at 70 °C it's 520 A. That's a 17% drop from the 40 °C base. If you're packing this into a crowded enclosure or it's sitting near other heat sources, use the derated figure for your load calculation, not the catalog number.
Physical fit and auxiliary configuration
Dimensions: 138 mm wide, 248 mm tall, 110 mm deep. If you need those options, you're looking at a different suffix.