Its interrupting capacity hits 242 kA at 240 V and 187 kA at 415 V and 440 V — figures that tell you it's built for high-fault panels where selectivity and SCCR headroom matter. The ETU320 electronic trip unit handles the overcurrent release; a shunt trip (STL) is integrated for remote opening.
The 63 A rating holds flat from 40 °C to 50 °C; above that it derates to 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 your panel ambient runs at 60 °C, you lose about 4.7 A — enough to matter on a borderline load. The 242 kA at 240 V is the headline number, but the real-world test is 187 kA at 415 V (common in European industrial distribution) and 121 kA at 500 V.