Interrupting capacity and thermal derating — the numbers that govern the fit
Per the datasheet, the interrupting capacity at 240 V is 187 kA, at 415 V and 440 V it holds 121 kA, at 500 V it drops to 79 kA, and at 690 V it is 3.4 kA. Above 50 °C the breaker derates linearly: 60.6375 A at 55 °C, 58.275 A at 60 °C, 55.9125 A at 65 °C, and 53.55 A at 70 °C. If the panel ambient runs at 60 °C, the continuous load must stay under 58.275 A — the 63 A nameplate applies only up to 50 °C.
No auxiliary contact is fitted as standard; the shunt trip (STL) is the only integrated auxiliary release.