The Siemens 3VA2463-5HM32-0KJ0 is a 3-pole SENTRON molded case circuit breaker rated for 630 A continuous at 40 °C, with a thermal derating curve that drops to 520 A at 70 °C — a straight line the panel designer can bank on for enclosure sizing. The adjustable trip unit spans 945 A minimum to 5670 A maximum, so this breaker is set up as a main or heavy feeder device, not a branch-level component. Short-circuit interrupting capacity hits 187 kA at 240 V, 121 kA at 415/440 V, and still holds 75.6 kA at 500 V; only at 690 V does it drop to 9 kA, which keeps it on the 480 V class switchboard side of the arc-flash boundary.
Below 40 °C you get no upside — the rating is fixed at the 40 °C mark. Above 40 °C the derate is linear: 612 A at 45 °C, 593 A at 50 °C, 575 A at 55 °C, 557 A at 60 °C, 538 A at 65 °C, 520 A at 70 °C. If the enclosure ambient hits 50 °C, the breaker effectively becomes a 593 A device; don't load the bus to 630 A and expect the trip unit to hold.
Environmental and auxiliary release details
No undervoltage release is fitted on this variant. The trip indicator and voltage trigger are present, so the breaker can signal a trip condition externally without relying on the aux switch alone.