400 A MCCB with ETU320 — interrupting capacity and thermal derating
The Siemens SENTRON 3VA2440-6HL32-0CA0 is a 3-pole molded case circuit breaker rated for a continuous current Iu of 400 A, with an ETU320 electronic overcurrent release and an integrated undervoltage release. Its interrupting capacity reaches 242 kA at 240 V and 187 kA at 415 V. The breaker carries the full 400 A up to 50 °C ambient; above that, derate to 384 A at 55 °C, 376 A at 60 °C, 368 A at 65 °C, and 360 A at 70 °C (–). Maximum power loss is 66 W.
Panel integration — dimensions and mounting
The 3VA2440-6HL32-0CA0 measures 248 mm high, 138 mm wide, and 110 mm deep. It mounts on a DIN rail or directly to a backplate in an enclosure. The 138 mm width is a standard 3-pole MCCB footprint — verify gland-plate cutout and wire-bending space per manufacturer guidelines.
Interrupting ratings at system voltages
Rated short-circuit breaking capacity: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 40 kA at 690 V (–). These values cover most industrial distribution voltages up to 690 V.