Siemens SENTRON 3VA2340-7HL32-0DH0 — 400 A MCCB with Undervoltage Release
Its interrupting capacity reaches 330 kA at 240 V and 242 kA at 415 V and 440 V, dropping to 187 kA at 500 V and 7.5 kA at 690 V — the 690 V figure is the one that governs high-voltage industrial feeds, so verify your fault level against that number if your system runs at 690 V line-to-line. The trip indicator on the front confirms whether the breaker opened on fault or manual command. Thermal derating is flat at 400 A from 40 °C through 50 °C, then steps down: 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, and 340 A at 70 °C. Maximum power loss is 98.5 W, which factors into enclosure thermal calculations.
The undervoltage release and auxiliary switch block add depth on the side — account for wiring clearance when laying out the enclosure.