630 A MCCB with ETU560 — what the ratings mean for your panel
The Siemens SENTRON 3VA2463-5JQ32-0AJ0 is a 3-pole molded case circuit breaker rated for 630 A continuous current at 40 °C, with an ETU560 electronic trip unit. This is the line protection version — no undervoltage release, no voltage trigger, no phase failure detection built in. What matters for your BOM line is the breaking capacity curve: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 17 kA at 690 V. That means it can interrupt fault currents up to those levels without upstream cascading, which drives the SCCR rating of the entire panel section. The thermal derating is published per 5 °C steps from 40 °C to 70 °C: 630 A at 40 °C, 600 A at 45 °C, 570 A at 50 °C, 540 A at 55 °C, 510 A at 60 °C, 480 A at 65 °C, and 450 A at 70 °C. If your panel ambient runs at 50 °C, you lose 60 A of headroom — plan the load accordingly. The maximum power loss is 162 W, which matters for enclosure thermal rise calculations.
Footprint and panel integration
Dimensions are 248 mm high, 138 mm wide, 110 mm deep. The 138 mm width is standard for a 3-pole 630 A frame in the SENTRON 3VA2 series — it occupies the same mounting footprint as other 3VA2 breakers in this current class, so a panel laid out for a 3VA2 630 A frame accepts this unit without re-drilling the backplate. Front IP40 protection keeps dust out of the trip-unit interface. The auxiliary contact version is 2 auxiliary switches plus 1 trip alarm switch (HP type). That gives you two form-C signals for status feedback and one dedicated alarm contact that changes state only on a trip event — useful for remote annunciation without wiring through the aux contacts.