630 A MCCB with ETU350 — what the ratings mean for your panel
The Siemens 3VA2463-5HN32-0AC0 is a 3-pole SENTRON molded case circuit breaker rated for 630 A continuous current at 40 °C, with an ETU350 electronic trip unit handling line protection. The 187 kA interrupting rating at 240 V tells you it can clear a fault up to that level without upstream fuses — that's the short-circuit current rating (SCCR) the panel label needs. At 415 V and 440 V it still holds 121 kA, and at 690 V it drops to 17 kA, so the voltage you're feeding matters for coordination studies. Thermal derating is built in: at 45 °C it carries 612 A, at 50 °C 593 A, stepping down to 520 A at 70 °C. If your enclosure runs hot, factor the curve — the 630 A nameplate is only valid at 40 °C ambient. Dimensions are 248 mm high, 138 mm wide, 110 mm deep — the 110 mm depth matters for shallow backpanel layouts where gland plates or busbars eat into clearance. IP40 on the front means it's protected against solid objects over 1 mm but not sealed against moisture; keep it inside the enclosure, not on a washdown zone.
Integration and compliance notes
The 3VA2463-5HN32-0AC0 ships with 2 auxiliary switches (HQ type) pre-installed — no separate order for aux contacts on the first fit. No undervoltage release, no ground-fault monitoring, no communication module on this variant; those are add-on accessories if your design needs them. The base switch supplied is 3VA2463-5HN32-0AA0, so the -0AC0 is the fully assembled catalog number with the aux contacts. Rated insulation voltage is 800 V, storage range -40 °C to 80 °C, operating range -25 °C to 70 °C. Maximum power loss is 162 W — factor that into enclosure thermal calculations if you're packing multiple breakers in a single cabinet.