Rating and duty — what the numbers mean for the panel
The Siemens SENTRON 3VA2463-6HN32-0DC0 is a 3-pole molded case circuit breaker (MCCB) rated for 630 A continuous current at 40 °C ambient, per the datasheet. That 630 A is the thermal baseline; at 50 °C it derates to 593 A, at 60 °C to 557 A, and at 70 °C to 520 A — so if the panel ambient runs hot, the effective ampacity drops by roughly 1.2 % per degree above 40 °C. The interrupting capacity at 240 V is 242 kA, at 415 V it holds at 187 kA, and at 690 V it drops to 9 kA. For a 480 V distribution board, the 187 kA rating at 440 V is the closest published point — that gives substantial SCCR headroom for most industrial service-entrance applications.
Built-in release and auxiliary switching
This variant ships with an undervoltage release (UVR) and two HQ auxiliary switches integrated — the UVR trips the breaker when control voltage drops below the dropout threshold, which is standard for emergency-stop or safety-shutdown circuits that need a loss-of-voltage trip. The auxiliary switches provide status feedback (open/closed) to a PLC or annunciator without requiring an external limit switch. The base switch is order code 3VA2463-6HN32-0AA0; the -0DC0 suffix adds the UVR and aux package. No communication module is fitted, so this is a standalone line-protection device — no Modbus or PROFIBUS bridge inside the housing.
Physical fit — DIN-rail and enclosure integration
Dimensions are 248 mm height, 138 mm width, 110 mm depth — a standard 3-pole MCCB footprint for 630 A frame size. The 110 mm depth means it clears most 200 mm-deep enclosures with room for rear busbars or cable ladders. Width of 138 mm is the panel cutout dimension; verify gland-plate knockouts match before drilling. No trip indicator on the front face, so status is read from the aux contacts or the handle position.
Temperature derating curve — what the table tells you
The continuous-current rating is published at seven ambient points from 40 °C to 70 °C: 630 A at 40 °C, 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. That is a linear derating of roughly 2.2 A per °C above 40 °C. If the panel is in a non-air-conditioned electrical room that hits 55 °C in summer, the breaker's effective rating is 575 A — not 630 A. The maximum power loss is 164.5 W, which factors into enclosure thermal rise calculations.