What this MCCB brings to the panel
The Siemens SENTRON 3VA2440-6HN32-0KL0 is a 3-pole molded case circuit breaker rated for 400 A continuous at 40 °C — and it holds that same 400 A all the way up to 70 °C without derating, which is a solid advantage when the panel runs hot next to a motor or drive. Interrupting capacity hits 242 kA at 240 V, 187 kA at 415 V, and still 121 kA at 500 V — that's high-fault headroom for a 400 A frame, meaning it handles a hard bolted fault without upstream coordination headaches.
Line protection design with auxiliaries
This MCCB is built for line protection — no ground-fault monitoring, no communication module, no undervoltage release. It carries a shunt trip (STL) and a full complement of auxiliary switches: 2 auxiliary switches plus 1 trip alarm switch plus 1 electrical alarm switch HQ, so the PLC knows exactly what happened and when. The basic switch inside is order code 3VA2440-6HN32-0AA0; this -0KL0 suffix adds the auxiliary and alarm package. It ships with a voltage trip indicator and a mechanical trip indicator — no guesswork when you walk the route and see a flagged handle.
Panel fit and environment
Footprint is 138 mm wide by 248 mm tall by 110 mm deep — that's 5.43 by 9.76 by 4.33 inches. It mounts on a DIN rail or direct-panel bolt pattern common to the SENTRON 3VA family, so swapping into an existing 400 A line-up usually means no re-drilling. Operating range is -25 °C to 70 °C ambient, storage from -40 °C to 80 °C. Max power loss is 63.5 W — that's the heat it dumps into the enclosure, so factor that into your thermal budget if you're packing several breakers in a tight box.