What this 400 A MCCB delivers — and the decisions it drives
The trip unit is programmable and the breaker carries a communication function, so it integrates into a power-monitoring or selective-coordination scheme rather than sitting as a standalone thermal-magnetic device.
Breaking capacity across voltages — where the 242 kA matters
The interrupting ratings drop as voltage rises: 242 kA at 240 V, 187 kA at both 415 V and 440 V, 121 kA at 500 V, and 40 kA at 690 V. That 40 kA at 690 V is still a solid figure for a 400 A frame — it clears faults on 690 V industrial networks without cascading to upstream gear.
Thermal derating — the real-world current you can carry
Above that it derates linearly: 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 is the installed projection from the mounting surface, so verify clearance to the enclosure door or busbar shroud. Four HQ auxiliary switches are factory-integrated; no separate aux block to wire in the field.