MCCB with 125 A continuous rating and 121 kA interrupting capacity
Its interrupting capacity reaches 121 kA at 240 V and 75.6 kA at 415 V — enough for high-fault utility feeds or transformer secondaries where the available short-circuit current is substantial. Three auxiliary switches (HQ type) are built in, so you get status feedback without adding a separate aux block.
Current derating and thermal performance
Above that, it derates stepwise: 120 A at 55 °C, 117.5 A at 60 °C, 115 A at 65 °C, and 112.5 A at 70 °C. In a crowded panel with ambient near 60 °C, you lose about 6 % of the nominal current — plan the load accordingly. The 15 000 mechanical endurance cycles are typical for a fixed-mounted MCCB of this class.
Depth of 70 mm leaves clearance for rear bus connections in a standard distribution panel.