630 A MCCB with ETU350 — what the ratings mean for panel fit
The Siemens 3VA2463-7HN42-0AA0 is a SENTRON molded case circuit breaker rated for 630 A continuous current, configured as a 4-pole unit with an ETU350 electronic overcurrent release. This is a line-protection design — meaning it's intended for feeder or main breaker duty, not motor branch-circuit protection where a different trip curve would be needed. The 630 A rating is the continuous current at 40 °C ambient; the thermal derating table shows it carries 612 A at 45 °C, 593 A at 50 °C, and drops to 520 A at 70 °C — so if the panel ambient runs hot, the effective ampacity is lower than the nameplate figure. Breaking capacity is the other headline number: 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 9 kA at 690 V. That 330 kA at 240 V is exceptionally high — it handles the full available fault current at the secondary of a large distribution transformer without needing a current-limiting fuse upstream. At 690 V the 9 kA figure is modest by comparison, so verify the available fault current at that voltage level before committing the BOM line.
Panel integration — dimensions and mounting
The 3VA2463-7HN42-0AA0 measures 248 mm high by 184 mm wide by 110 mm deep. That 184 mm width for a 4-pole frame is standard for the 3VA2 platform — it occupies the same footprint as other 4-pole units in the series. The 110 mm depth includes the arc chamber and terminals; allow clearance for cable bending radius at the line and load lugs. IP40 on the front means the breaker face is protected against tools and solid objects over 1 mm, but not sealed against moisture — suitable for indoor switchgear, not washdown environments.
Lifecycle and sourcing posture
The lifecycle stage is listed as current — meaning the manufacturer continues to produce this order code without a phase-out notice. No successor has been assigned. For a BOM freeze or a line-down replacement, this part is sourced to order through independent distribution; availability and current pricing are confirmed at quote time against an RFQ.