The Siemens SENTRON 3VA2440-6HN32-0BL0 is a 3-pole molded case circuit breaker rated 400 A continuously across the full 40 °C to 70 °C ambient range — no derating needed up to that ceiling. The basic switch core is order code 3VA2440-6HN32-0AA0, so if you already have that bare breaker and need the auxiliaries, this is the assembled version.
Breaking capacity across common voltages
At 240 V it clears 242 kA, at 415 V and 440 V it holds 187 kA, at 500 V it drops to 121 kA, and at 690 V it still manages 9 kA. The 5 kA limited-to-1-second rating is a short-time withstand figure for selective coordination; if you are coordinating downstream breakers, that number governs the delay band.