What this MCCB carries and where it fits
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. Breaking capacity sits at 187 kA at 415 V, which covers most industrial secondary-side fault levels without cascading upstream. It ships with an undervoltage release (UVR) and a full auxiliary switch deck: 2 auxiliary switches, 1 trip alarm, and 1 electrical alarm switch, all factory-fitted. 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. That curve tells you this breaker is built for low-voltage distribution where the available fault current is high — typical for transformer secondaries or large motor control center mains. 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.
Panel fit and environment
Dimensions are 248 mm high, 138 mm wide, 110 mm deep — standard SENTRON 3VA fixed-frame footprint. It mounts on a DIN rail or directly to a backplate via the screw lugs. Operating temperature range is -25 °C to +70 °C, storage from -40 °C to +80 °C. Maximum power loss at rated load is 66 W, so factor that into enclosure thermal calculations if you are packing several breakers in a sealed cabinet.