125 A MCCB with TM240 release — panel integration note
Breaking capacity is voltage-dependent: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 10.5 kA at 690 V. That covers most low-voltage distribution panels in North American and European 400 V class systems. Thermal derating is published from 40 °C through 70 °C: the breaker holds full 125 A up to 50 °C, then steps down to 120 A at 55 °C, 117.5 A at 60 °C, 115 A at 65 °C, and 112.5 A at 70 °C.
Footprint and mounting
That 76.2 mm width is a standard 3-pole MCCB footprint — three 25.4 mm pole pitches — so it drops into the same DIN-rail or panel-mount cutout as other 125 A frame breakers.