125 A MCCB with undervoltage release — line protection for distribution panels
Its breaking capacity reaches 75.6 kA at 240 V AC, 52.5 kA at 415 V, and 32 kA at 440 V — figures that determine whether this breaker clears a fault without upstream coordination issues. The 125 A rating holds steady through 50 °C, then derates to 122 A at 55 °C and 114 A at 70 °C, so panel ambient temperature directly governs the usable load.
Dimensions are 130 mm height, 76.2 mm width, and 70 mm depth — a 3-pole footprint that matches the SENTRON 3VA family. Width at 76.2 mm (3 inches) is the standard 3-pole MCCB pitch; verify that the DIN-rail or mounting-plate holes align with the existing cutout if replacing a different brand. Maximum power dissipation is 30.6 W — a figure to include in enclosure thermal calculations, especially in sealed or high-density panels.