Its interrupting capacity hits 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 5 kA at 690 V — so at typical 400 V distribution voltages it clears 187 kA faults without cascading upstream. The auxiliary release is a shunt trip (STL) only, and the auxiliary contact package is two HQ-form switches. If your BOM needs undervoltage release or ground-fault alarm, this variant won't carry it without adding external modules.
Thermal derating — where the 63 A holds and where it tapers
At 55 °C it derates to 60.6375 A, at 60 °C to 58.275 A, at 65 °C to 55.9125 A, and at 70 °C to 53.55 A. In a sealed panel with internal temperature rise, expect to size the breaker for the actual ambient at the mounting location — the 63 A nameplate holds only up to 50 °C.
Physical fit — panel footprint
The 86 mm depth includes the shunt trip housing — verify clearance to the gland plate or door if the panel is shallow.