What the breaking capacity ratings mean for fit
Its interrupting capacity is the headline selection parameter: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 7.5 kA at 690 V. The 7.5 kA at 690 V still covers most industrial 690 V distribution, but if your system sits at 690 V with fault current above that, this part is not the fit.
Thermal derating and continuous current
Above that, derating is linear: 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, and 340 A at 70 °C. In a sealed, uncooled panel with ambient near 60 °C, you lose 7.5 % of the continuous rating — plan the load accordingly. The maximum power loss is 96 W, which factors into enclosure thermal rise calculations.
Auxiliary switching and trip indication
The trip alarm signals the breaker's thermal-magnetic or electronic trip event to a PLC or annunciator — useful for remote fault diagnostics. A mechanical trip indicator is present on the front face.