Line Protection MCCB with Undervoltage Release
The 121 kA breaking capacity at 240 V gives headroom for high-fault installations; at 415 V it still interrupts 75.6 kA, and at 690 V it holds 11.9 kA.
The 50 A rating holds flat from 40 °C to 50 °C ambient, then derates to 48 A at 55 °C, 47 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. In a sealed panel with multiple breakers ganged, the 70 °C derating figure (45 A) is the realistic continuous limit — plan for that if the enclosure runs hot. Dimensions are 70 mm deep, 101.6 mm wide, and 130 mm high — a standard 4-pole MCCB footprint for DIN-rail or screw-mount panel integration.