400 A continuous, flat derating curve to 70 °C
The Siemens SENTRON 3VA2440-6HN32-0BA0 is a 3-pole molded case circuit breaker (MCCB) rated for 400 A continuous across the full 40 °C to 70 °C ambient range — no derating needed up to that ceiling. That means it holds its full 400 A in a warm panel without bumping frame size. Breaking capacity hits 242 kA at 240 V, 187 kA at 415 V, and still 121 kA at 500 V — high enough for most industrial main feeders and large motor branch circuits.
Undervoltage release fitted, no auxiliary switch
No auxiliary switch is included; if you need status feedback to a PLC, plan for a separate aux block. The footprint is 110 mm deep, 138 mm wide, 248 mm tall — a standard SENTRON 3VA fixed-panel mount. Power loss is rated at 66 W maximum.