63 A MCCB with ETU350 — selectivity and SCCR headroom
The Siemens SENTRON 3VA2163-7HN32-0AF0 is a 3-pole molded case circuit breaker rated 63 A continuous at 40 °C, with an ETU350 electronic trip unit for line protection. Thermal derating starts above 50 °C: still holds 63 A at 50 °C, drops to 60.6 A at 55 °C, and 53.6 A at 70 °C. The 4 W maximum power loss is low enough that ventilation in a standard enclosure handles it without forced air.
The front face carries an IP40 protection class, so it's fine for dry indoor enclosures but not washdown zones. If you need remote status or shunt trip, you'll add those externally.