What this MCCB carries and where it fits
The Siemens SENTRON 3VA2463-6HN32-0DH0 is a 3-pole molded case circuit breaker rated for 630 A continuous at 40 °C, built for line protection in distribution panels and industrial switchboards. Its interrupting capacity hits 242 kA at 240 V and still holds 187 kA at 415 V — that's enough to clear high-fault conditions without cascading upstream breakers, which matters when you're feeding a transformer or a busway with stiff utility supply. The breaker ships with an undervoltage release (UVR) factory-fitted, plus two auxiliary switches and a trip alarm switch (HQ) — so you get remote status indication and undervoltage protection out of the box without ordering add-on modules separately. The supplied basic switch is order code 3VA2463-6HN32-0AA0, which is the core breaker body; the -0DH0 suffix denotes the UVR and auxiliary configuration. Dimensions are 248 mm high, 138 mm wide, 110 mm deep — a standard SENTRON 3VA frame size that bolts into existing 3VA panel cutouts and busbar arrangements. If you're swapping an older 3VA frame (say a 3VA2116-5HL32-0AK0), the footprint and mounting centers are the same; the difference is the current rating and interrupting capacity, not the physical fit.
Thermal derating and real-world loading
The 630 A rating is at 40 °C ambient. At 50 °C it derates to 593 A, at 60 °C to 557 A, and at 70 °C to 520 A. If your panel ambient runs hot — common in enclosed switchgear or near furnace lines — size the load to the derated value, not the catalog 630 A. The breaker's maximum power dissipation is 164.5 W (all three poles conducting), which factors into enclosure thermal rise calculations.