What it is and what the ratings mean
The Siemens 3VA2463-7KP42-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 630 A continuous current at 40 °C, with an ETU850 electronic trip unit. The 4-pole design handles three-phase plus neutral, and the 630 A frame means it feeds a main distribution board or a large motor control center — not a branch circuit. The ETU850 gives you adjustable long-time, short-time, instantaneous, and ground-fault protection, plus a communication function for remote monitoring via the breaker's own bus. Breaking capacity is the headline: 330 kA at 240 V, 242 kA at 415 V, and still 187 kA at 500 V. That means this breaker can interrupt a fault current up to those levels without welding its contacts or rupturing the case — critical for high-capacity transformer secondaries or large motor feeds where the available fault current is high. At 690 V the capacity drops to 9 kA, so if you're on a 690 V system, verify the upstream coordination. The continuous current derates with ambient temperature: 630 A at 40 °C, 570 A at 50 °C, 510 A at 60 °C, and 450 A at 70 °C. If your panel runs hot (say 50 °C inside), you lose about 10 % of the ampacity — size your load accordingly. The insulation voltage is rated 800 V, and the maximum power loss is 162 W, which matters for enclosure heat calculation.
Panel fit and integration
Dimensions: 248 mm high, 184 mm wide, 110 mm deep. IP40 on the front.