It is designed for main or feeder protection in distribution panels where high interrupting capacity is required — 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 52.5 kA at 690 V — giving it a very high SCCR for fault duty up to those levels without cascading upstream.
The breaker carries its full 400 A rating from 40 °C up to 50 °C ambient; above that it derates linearly to 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, and 340 A at 70 °C. For a panel with a 50 °C internal ambient, no derating is needed. The 138 mm width, 248 mm height, and 110 mm depth fit standard SENTRON 3VA switchboard mounting footprints — verify gland-plate cutout against the existing panel layout. Maximum power loss is 96 W, which should be factored into enclosure thermal calculations.