What it is and what it does
The Siemens 3VA2463-5HN32-0HH0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection in distribution panels. It carries 630 A continuous at 40 °C across three poles, with a maximum interrupting capacity of 187 kA at 240 V — that figure drops to 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 9 kA at 690 V, so the voltage class of your fault bus decides whether this breaker clears a high-energy arc without venting or welding contacts. The 630 A rating is at 40 °C ambient; above that you derate linearly — 612 A at 45 °C, 593 A at 50 °C, 575 A at 55 °C, 557 A at 60 °C, 538 A at 65 °C, and 520 A at 70 °C. If your panel interior runs hot (say a packed enclosure near a roof in summer), size the load at the 70 °C figure, not the nameplate 630 A.
Fit and integration
The breaker measures 248 mm high, 138 mm wide, and 110 mm deep — a 3-pole frame that fits standard Siemens SENTRON mounting plates and busbar systems. The depth of 110 mm means it clears most 200 mm-deep enclosures with room for rear-connected busbars or a shunt trip (STL) wired behind the base. It ships with a basic switch (3VA2463-5HN32-0AA0) and includes 2 auxiliary switches plus 1 trip alarm switch (HQ configuration) for status feedback to a PLC or annunciator panel. A shunt trip release (STL) is built in — no undervoltage release on this variant, so if you need UVR protection you spec a different suffix. No communication module or ground-fault monitoring on this order code. If you need remote trip indication or GF protection, you step up to the 3VA2 with electronic trip units and communication options.
Lifecycle and sourcing
Maximum power loss is 162 W at full rated current — that heat has to leave the enclosure. If you're retrofitting into a panel originally built for a 5SQ2370-2YA05 frame, check the mounting footprint and busbar centers; the SENTRON 3VA series uses a different bolt pattern than the older 5SQ generation, so a direct drop-in without drilling or a busbar adapter is unlikely.