630 A MCCB with ETU350 — panel fit and breaking capacity
The Siemens SENTRON 3VA2463-6HN32-0AF0 is a 3-pole molded case circuit breaker rated for continuous current of 630 A at 40 °C, with an ETU350 electronic trip unit for line protection. The 242 kA breaking capacity at 240 V gives serious fault-current headroom for large distribution panels or transformer secondaries — you're not chasing selectivity curves at this level. The 110 mm depth and 138 mm width keep it within a standard MCCB footprint, so it swaps into existing SENTRON switchboard layouts without re-drilling gland plates.
Thermal derating and operating range
Rated 630 A at 40 °C, it derates to 520 A at 70 °C — that's about 17 % loss across the full ambient span. If the panel runs hot near the 70 °C max, size the upstream transformer or bus accordingly. The -25 °C to 70 °C operating range covers most indoor industrial environments; storage tolerance from -40 °C to 80 °C handles site shutdowns and cold warehouses.
Trip unit and auxiliary contacts
The ETU350 electronic trip unit provides adjustable overload and short-circuit protection curves — no voltage trigger or communication function on this variant, so it's a straight line-protection breaker without remote monitoring. Ships with one auxiliary switch and one trip alarm switch (HQ type), enough for a remote open/closed and fault indication back to the PLC or panel HMI. The integrated auxiliary trip is order code 3VA9608-0BB11 if you need to add a shunt or undervoltage release later.
Breaking capacity across voltages
Breaking capacity drops from 242 kA at 240 V to 40 kA at 690 V — still a strong number for a 630 A frame at the higher voltage. At 415 V and 440 V it holds 187 kA, at 500 V it's 121 kA. That covers most industrial low-voltage networks without needing a current-limiting upstream breaker.