The 63 A rating holds flat from 40 °C through 50 °C, then derates to 56.7 A at 70 °C; if your panel ambient runs hot, that derating curve is what governs the actual load it can carry.
The 187 kA at 240 V is the headline SCCR, but the real-world selectivity planning happens at the 415 V and 440 V levels where it still holds 121 kA. At 500 V it drops to 75.6 kA, and at 690 V to 17 kA.
Dimensions are 105 mm wide, 181 mm high, 86 mm deep — a standard 3-pole MCCB footprint that fits SENTRON 3VA2 mounting plates and busbar adapters. Maximum power loss of 75 W at rated load means the panel ventilation must handle that heat; in a sealed enclosure with multiple breakers, the cumulative dissipation drives the cooling calculation.