MCCB for high-fault panel feeds
The 187 kA at 240 V is the headline number, but the real-world selectivity story is at 415 V and 440 V, where it still holds 121 kA — enough to coordinate with most downstream distribution breakers in a 400 V industrial panel. At 500 V the rating drops to 79 kA, and at 690 V it falls to 4.25 kA, so this frame is not intended for 690 V main feeds; that's a motor-circuit or sub-distribution role at the lower end of the voltage range.
Thermal derating and panel fill
The breaker holds 100 A from 40 °C through 50 °C, then derates linearly to 85 A at 70 °C.