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
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.
Footprint is 138 mm wide by 248 mm tall by 110 mm deep — that's 5.43 by 9.76 by 4.33 inches.