MCCB for line protection with undervoltage release
Rated 125 A at 40 °C and carrying 75.6 kA breaking capacity at 240 V, this MCCB handles high fault currents typical of industrial main feeders or large sub-distribution boards.
Breaking capacity drops with system voltage: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at both 500 V and 690 V.
Current rating holds at 125 A up to 50 °C ambient, then derates linearly: 122 A at 55 °C, 120 A at 60 °C, 117 A at 65 °C, and 114 A at 70 °C. Maximum power loss is 30.6 W — account for this in enclosure thermal calculations, especially in high-density panels.
Dimensions are 130 mm height, 76.2 mm width (3 inches), and 70 mm depth. The 3-pole width is standard for this current class — verify busbar or cable lug spacing against the existing panel layout.