It's designed for main or feeder protection in distribution panels, switchboards, and motor control centers. The 125 A frame at 40 °C through 50 °C holds full rating, then derates gradually to 114 A at 70 °C, which matters if your panel runs hot near a drive or transformer. Active in production (lifecycle stage: current).
Breaking capacity across voltages — what it means for your panel
The interrupting rating changes with system voltage, and you need to match it to your available fault current. At 240 V it's 121 kA; at 415 V it's 75.6 kA; at 440 V it's 52.5 kA; at 500 V and 690 V it drops to 11.9 kA.
Power loss at rated load is 28.1 W, which adds to your enclosure heat budget.
