It carries a 242 kA interrupting rating at 240 VAC and still delivers 187 kA at 415 V and 440 V, dropping to 121 kA at 500 V and 7.5 kA at 690 V — so it handles high-fault-current service entrances and main feeders without cascading upstream. The unit ships with two auxiliary switches (HP design) factory-installed and no auxiliary release or undervoltage release.
Above that it derates: 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, and 340 A at 70 °C. Maximum power loss is 96 W, so account for that heat in the enclosure ventilation calculation.
