The interrupting rating drops as system voltage rises: 187 kA at 415 V and 440 V, 121 kA at 500 V, and 40 kA at 690 V. That 40 kA at 690 V still covers most industrial 690 V distribution panels, but verify your available fault current at the point of installation — if your SCCR calculation lands above 40 kA at 690 V, this breaker won't hold.
Full 400 A rating holds through 50 °C ambient; above that it derates to 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. The 110 mm depth and 138 mm width fit standard MCCB mounting footprints, but the 248 mm height needs clearance for the rotary handle and arc-chamber venting.
Trip unit and auxiliary contacts
Maximum power loss is 96 W, which factors into enclosure thermal calculations.