It's a line-protection device, not a motor-protective or ground-fault version — no undervoltage release, no phase-failure detection, no communication module onboard. For a panel-builder, that's a clean fit where you need a straight feeder breaker with no auxiliary logic.
This MCCB delivers 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V.
Thermal derating — continuous current across ambient temperature
Above that it derates: 24 A at 55 °C, 23.5 A at 60 °C, 23 A at 65 °C, and 22.5 A at 70 °C. That's a shallow derating curve — you lose only 2.5 A over a 30 °C rise. For a panel running warm (say 55 °C near the top of a sealed enclosure), you still get 24 A of headroom. The rated insulation voltage is 800 V, and the operating range is -25 °C to 70 °C, with storage from -40 °C to 80 °C.
Physical fit and auxiliary contacts
That gives you two form-C signals for status feedback and a dedicated alarm contact that changes state only on a trip event, not on manual switching.