The 63 A rated continuous current (Iu) holds steady from 40 °C up to 50 °C, then derates gradually to 56.7 A at 70 °C, so you size it for the ambient inside the enclosure, not the panel room temperature. The ETU310M electronic trip unit handles the curve; no communication function or phase failure detection on this variant, just straight thermal-magnetic-style protection with an undervoltage release (UVR) integrated.
The 330 kA at 240 V is the headline number, but the real-world duty is lower at distribution voltages: 242 kA at 415 V and 440 V, 187 kA at 500 V, and 52.5 kA at 690 V.
Auxiliary contacts and trip alarm wiring
The trip alarm switch closes on a fault trip, the electrical alarm switch signals when the UVR has operated. The base switch itself is order code 3VA2163-7MS36-0AA0; the integrated auxiliary trip module is 3VA9608-0BB24. If you're replacing just the trip unit or the aux block, those are the sub-component codes to cross.