Breaking capacity — the number that decides coordination
At 240 V it interrupts 187 kA; at 415 V it's still 121 kA; at 440 V it drops to 75.6 kA; at 500 V and 690 V it holds at 7.5 kA. That steep fall-off above 440 V is the key selection constraint — if your system fault current at 690 V exceeds 7.5 kA, this breaker won't clear it, and you need a higher-rated frame or upstream current-limiting fuse.
Full rated current holds at 63 A up through 50 °C ambient. At 55 °C it derates to 62 A, at 60 °C to 61 A, at 65 °C to 60 A, and at 70 °C to 58 A. In a sealed, tightly packed panel that runs hot, that derating curve is your real-world ampacity — don't size the load to 63 A if the enclosure ambient is over 50 °C. That 76.2 mm (3-inch) width is the standard 3-pole MCCB footprint — it drops into the same DIN-rail or panel-mount slot as other SENTRON 3VA frames of this size class.