It's built for high-fault applications: 242 kA breaking capacity at 240 V and 187 kA at 415 V, dropping to 121 kA at 500 V and 9 kA at 690 V. The 630 A rating tells you this is sized for a main feeder or a big motor circuit, not a branch panel.
Push the panel ambient to 50 °C and the breaker derates to 593 A; at 60 °C it's 557 A; at 70 °C it's 520 A.
What the ETU350 trip unit means for coordination
That matters when this breaker feeds sub-feeders: you can set the time delays so a fault on a branch trips the branch breaker first, not this main. If you need those features, you'd look at a different 3VA2 option code.