What the ratings mean for fit
The 3VA2463-7HN32-0AC0 is a Siemens SENTRON molded case circuit breaker (MCCB) rated for 630 A continuous current at 40 °C — that is the thermal benchmark for sizing in a closed panel. Above 40 °C the breaker derates 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 ambient runs 50 °C, the usable current is 593 A, not the nameplate 630 A. The interrupting ratings span 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 9 kA at 690 V — the 690 V figure drops sharply because arc extinction physics changes at that voltage. This is a line-protection design (not motor-protection), so it is intended for feeder and distribution duty, not direct motor starting. The failure mode to watch is thermal accumulation at the terminals under sustained high load. With a maximum power loss of 162 W, the breaker dissipates heat into the enclosure. If the panel is tightly packed with other heat sources, that 162 W shifts the internal ambient upward, which eats into the derating headroom. Plan the gland plate and ventilation accordingly — the 110 mm depth, 138 mm width, and 248 mm height give you the envelope for DIN-rail or screw-mount integration.
Lifecycle and sourcing reality
The basic switch variant is listed as 3VA2463-7HN32-0AA0 — the -0AC0 suffix indicates the auxiliary switch configuration: two auxiliary switches (HQ type) are fitted. No undervoltage release, no ground-fault monitoring, no communication function are included. If your spec requires those, this is the clean base variant.
Mounting and integration
Three-pole design, 110 mm deep × 138 mm wide × 248 mm tall. The width is the critical panel cutout dimension — 138 mm is standard for a 630 A frame MCCB in the SENTRON 3VA series. Verify the DIN-rail or screw-mount pattern against your existing backplate; the 3VA2463 frame shares the same footprint as other 630 A SENTRON breakers, so a panel cut for a 3VA2163-8HM32-0AA0 will accept this unit without rewiring.