630 A MCCB with ETU340 — selectivity and SCCR headroom
The Siemens SENTRON 3VA2463-8HK32-0AA0 is a 3-pole molded case circuit breaker rated for 630 A continuous at 40 °C, with an electronic ETU340 overcurrent release. Its interrupting capacity reaches 440 kA at 240 V, 330 kA at 415 V, and 52.5 kA at 690 V — figures that give the panel designer headroom for high-fault installations where upstream coordination demands a robust SCCR. The 630 A frame means this breaker handles main feeder or large motor-circuit duty in switchboards and distribution panels.
The continuous current derates from 630 A at 40 °C down to 520 A at 70 °C — a curve the panel builder must account for when calculating fill factor and ventilation. Maximum power loss is 162 W, which drives heat dissipation requirements inside the enclosure.