The Siemens SENTRON 3VA2463-6JQ32-0HH0 is a 3-pole molded case circuit breaker rated for continuous current Iu of 630 A at 40 °C, with an insulation voltage Ui of 800 V. That 630 A figure is the thermal backbone — it governs the main bus connection and sets the upper bound for the downstream load schedule.
Selectivity and thermal derating — the real coordination numbers
The 630 A rating holds only at 40 °C ambient. Above that, the continuous current derates linearly: 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 the panel ambient runs at 50 °C, this MCCB effectively becomes a 570 A device — that matters when you're coordinating with an upstream feeder breaker or sizing the busbar. Maximum power loss is 162 W, so ventilation inside the enclosure isn't optional; it's a thermal budget line item.
What the auxiliary contacts and releases tell you
Dimensions are 248 mm high, 138 mm wide, 110 mm deep — a standard 3-pole MCCB footprint for 630 A frame size. The 15 000 mechanical endurance cycles (latching) is typical for a 630 A electronic-trip MCCB — it's not a switching device for frequent motor starts, but it handles routine isolation and fault interruption without issue.