Its continuous current holds at 63 A across the full 40 °C to 70 °C ambient range — no derating needed up to that ceiling, which simplifies panel layout in warm enclosures. The interrupting ratings are the real differentiator: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V. At 415 V, 121 kA means this breaker can clear a fault current that would vaporize a standard 50 kA-rated unit — it's sized for high-capacity transformer secondaries or large motor banks where the available fault current is severe. The 3.7 kA at 690 V is the ceiling for that voltage class; verify your system's prospective short-circuit current at 690 V before specifying.
Dimensions are 105 mm wide, 181 mm high, 86 mm deep — a standard SENTRON 3VA frame footprint. The 86 mm depth leaves clearance for rear-access wiring; verify gland-plate depth against the enclosure's internal usable space. The shunt trip and auxiliary switch wiring exits the top, so allow bend radius above the breaker.