This MCCB delivers 220 kA at 240 V, 154 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 690 V. At 690 V the 17 kA rating still covers most industrial motor-control center bus faults, but the real strength is in the sub-480 V range.
Thermal derating — what 125 A actually means at panel temperature
At 55 °C it's 120 A, at 60 °C it's 117.5 A, at 65 °C it's 115 A, and at 70 °C it's 112.5 A. If your panel ambient runs 55 °C or higher, size the load side for the derated figure — the TM240 release won't trip early, but the continuous rating is what the thermal element is calibrated to.
Integrated undervoltage release
No auxiliary contact block is fitted (without), and there's no voltage trigger or communication function. The trip indicator is also absent, so you won't get a local flag; plan for a remote indication path if needed.
The 76.2 mm width is a standard 3-pole MCCB footprint — it occupies three 25.4 mm (1-inch) module positions on a DIN rail or panel-mount plate.