The 125 A rating holds flat from 40 °C through 50 °C — no derating needed in a warm enclosure — then drops gradually to 112.5 A at 70 °C ambient. That thermal curve matters when you're packing breakers into a crowded panel and need to know the real ampacity at operating temperature.
This MCCB delivers 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 10.5 kA at 690 V. For a 415 V industrial feeder, 52.5 kA gives headroom above typical transformer fault levels (usually 25–40 kA), so you can coordinate downstream without cascading. At 690 V the 10.5 kA figure is lower, which is typical for a 125 A frame on higher voltage — check the available fault current at your secondary before committing this breaker to a 690 V bus.
Built-in undervoltage release — no auxiliary contacts
There is no separate auxiliary contact version on this variant, and no communication module or ground-fault monitoring. If you need remote status feedback, you'll add an external auxiliary switch block.