The Siemens SENTRON 3VA2440-6HL32-0HC0 is a 3-pole molded case circuit breaker rated for 400 A continuous current at 40 °C, carrying the ETU320 electronic trip unit for line protection. The shunt trip (STL) and two HQ auxiliary switches are factory-integrated — no field assembly of add-on blocks.
Above that, it derates to 384 A at 55 °C, 376 A at 60 °C, 368 A at 65 °C, and 360 A at 70 °C. The maximum power loss of 63.5 W matters for enclosure thermal calculations; that heat has to leave the cabinet.
The 3-pole footprint is standard for this frame size; verify the 138 mm width against the existing panel cutout or busbar spacing before committing the panel layout.
Trip unit and auxiliary configuration
The ETU320 electronic trip unit provides LI (long-time and instantaneous) protection for line/cable and distribution duty. It is not a ground-fault or phase-failure detection device — those functions are absent.