The Siemens 3VA2463-6KP32-0HH0 is a 3-pole SENTRON molded case circuit breaker rated for 630 A continuous current at 40 °C, with an ETU850 electronic trip unit. The 630 A figure is the maximum uninterrupted current the breaker can carry under the listed conditions — above that, the trip unit initiates a protective opening. Breaking capacity is the other headline: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 40 kA at 690 V. The front panel carries IP40 protection.
Temperature derating — the curve that governs real-world current
The 630 A rating is valid at 40 °C ambient. Above that, the breaker must be derated: 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, the usable continuous current drops to 570 A — a 9.5 % reduction.
Physical footprint: 248 mm height, 138 mm width, 110 mm depth. The 138 mm width is the 3-pole frame width — verify the mounting cutout in your switchgear matches. The 110 mm depth includes the rear arc chamber and terminal extensions; ensure clearance behind the mounting plate for cable lugs and bus connections.
Maximum power loss is 162 W at rated current. That heat must be dissipated inside the enclosure — factor it into your panel cooling calculation, especially if the breaker is grouped with other high-current devices in a sealed cabinet.