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.
Thermal derating and panel integration
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. Dimensions are 248 mm high, 138 mm wide, and 110 mm deep, fitting standard MCCB mounting footprints in switchgear. Front-face protection is IP40, suitable for enclosed distribution boards where the door provides the environmental seal. Maximum power loss is 162 W, which drives heat dissipation requirements inside the enclosure.