MCCB for line protection with high interrupting capacity
Its interrupting capacity reaches 220 kA at 240 V, 154 kA at 415 V, and 75.6 kA at 440 V — figures that cover most industrial fault-current scenarios without needing an upstream current-limiting fuse. Two HQ auxiliary switches are built in, giving status feedback for the open/closed position without needing an external contact block.
Current derating and thermal performance
Above that, current must be derated: 153.6 A at 55 °C, 150.4 A at 60 °C, 147.2 A at 65 °C, and 144 A at 70 °C. For a panel running warm — say 55 °C internal ambient — the effective continuous current drops about 4 %, which matters when sizing for a near-full bus.
The breaker accepts plug-in or fixed connections depending on the base adapter; verify the panel's busbar pitch against the 76.2 mm width before committing the cutout.