630 A MCCB with ETU550 — what the ratings mean for your panel
The Siemens 3VA2463-5JP32-0KG0 is a SENTRON molded case circuit breaker rated 630 A at 40 °C ambient, with a maximum breaking capacity of 187 kA at 240 V AC. That 187 kA figure is the short-circuit current it can safely interrupt at 240 V — relevant for high-fault service-entrance or distribution panels where available fault current exceeds typical 65 kA or 100 kA ratings. At 415 V and 440 V it still holds 121 kA, and at 690 V it drops to 9 kA, so the voltage-dependent curve is what governs your SCCR coordination study. Power loss is 162 W max at rated load, so factor that into enclosure ventilation if the panel is densely packed. Ambient operating range is -25 °C to 70 °C, with current derating starting at 40 °C — at 50 °C it's 570 A, at 60 °C it's 510 A, and at 70 °C it's 450 A. The storage range (-40 °C to 80 °C) covers cold warehouses and hot shipping containers.
Panel fit — dimensions and integration
Dimensions are 248 mm high, 138 mm wide, 110 mm deep. That 138 mm width for a 3-pole frame is standard for this class — it mounts on a DIN rail or directly to a backplate via the breaker's own mounting feet. The 110 mm depth leaves room for rear-connection busbars or cable lugs in a typical 600 mm deep enclosure.