The Siemens SENTRON 3VA2440-5HN32-0AJ0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying 400 A continuous current (Iu) at 40 °C through 50 °C, then derating to 384 A at 55 °C, 376 A at 60 °C, 368 A at 65 °C, and 360 A at 70 °C. That means in a 50 °C panel — common for enclosed switchgear — you still get full 400 A; above that, you must downrate the load or the breaker will nuisance-trip on thermal memory. Short-circuit breaking capacity is the headline: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 17 kA at 690 V. For a 480 V distribution panel in North America, the 121 kA at 440 V is the closest published point — well above typical 65 kA or 100 kA available fault current, so this breaker can be applied at the main or a high-fault subfeed without cascading upstream.
Panel integration and auxiliaries
That gives you two NO/NC status contacts for PLC feedback and one dedicated alarm contact that changes state only on a trip event — useful for remote fault annunciation without polling the trip unit. Maximum power loss is 63.5 W.