Its interrupting capacity hits 187 kA at 240 V and 121 kA at 415 V and 440 V, tapering to 75.6 kA at 500 V and 9 kA at 690 V — so on a 480 V distribution board it clears faults up to 75.6 kA without cascading upstream.
At 45 °C it carries 612 A, at 50 °C it carries 593 A, and at 55 °C it carries 575 A — a linear drop of roughly 18 A per 5 °C rise. By 70 °C the continuous rating is 520 A, so a panel builder who expects a 630 A bus at 50 °C needs to size the breaker for the actual ambient, not the 40 °C nameplate.
The 5 670 A rated current (minimum and maximum) is the frame's thermal-magnetic trip setting range — this breaker is adjustable, not fixed at 630 A.