Siemens 3VA1340-7EE32-0AA0 — 400 A SENTRON MCCB with TM220 release
The interrupting capacity hits 440 kA at 240 V, which covers most low-voltage fault scenarios without cascading upstream breakers.
At 415 V the 3VA1340-7EE32-0AA0 still clears 242 kA, and at 690 V it holds 17 kA — so the high 240 V figure isn't a single-point peak; the breaker carries real fault-clearing capability across the voltage range.
Current rating across ambient temperature
Rated current holds flat at 400 A from 40 °C up to 50 °C, then derates gradually: 392 A at 55 °C, 384 A at 60 °C, 376 A at 65 °C, 367 A at 70 °C. The maximum power loss is 92.1 W, which factors into enclosure ventilation sizing.