What this 630 A MCCB carries
The Siemens 3VA2463-5HL32-0KL0 is a SENTRON molded case circuit breaker rated for 630 A continuous at 40 °C, dropping to 520 A at 70 °C — so if your panel runs hot near the backplane, you derate off that 520 A floor, not the 630 A nameplate. Three-pole line-protection design with a shunt trip (STL) release and a full auxiliary switch complement: two auxiliary switches, one trip alarm, and one electrical alarm switch. That means you get both remote status and a dedicated fault signal without adding external relays. Breaking capacity runs 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 9 kA at 690 V — the 240 V figure tells you this breaker handles high-fault upstream feeds comfortably; the 690 V number is the weak link if you're on a 690 V system, so verify your available fault current.
Mounting and integration
Mounts in a standard panel cutout — 248 mm tall, 138 mm wide, 110 mm deep. That depth is tight for shallow enclosures; measure your backpanel clearance before committing the BOM. No communication module onboard, no undervoltage release, and no ground-fault monitoring — this is a straight line-protection breaker with a shunt trip for remote emergency-off circuits. If you need ground-fault or comms, you step up to the 3VA2 with those options.
Thermal derating curve
Rated 630 A at 40 °C ambient, 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 enclosure ambient sits at 50 °C, you lose roughly 6 % of the headline rating — plan your load accordingly. Maximum power loss at rated current is 162 W. That heat has to leave the enclosure; factor it into your ventilation or cooling budget.