It carries an ETU320 electronic trip unit — no communication, no voltage trigger, no ground-fault monitoring — just straightforward overcurrent protection with a trip indicator. Breaking capacity hits 330 kA at 240 V, 242 kA at 415 V, and still holds 52.5 kA at 690 V, so it handles high-fault utility feeds or transformer secondaries without cascading upstream.
The 400 A rating is continuous through 50 °C ambient; above that, derate to 384 A at 55 °C, 376 A at 60 °C, 368 A at 65 °C, 360 A at 70 °C. That thermal curve matters when the breaker shares a crowded enclosure with other heat sources — plan your fill factor around the actual ambient, not the nameplate. At 690 V the 52.5 kA still covers most industrial motor-control center bus faults.
Integration notes
No undervoltage release, no shunt trip, no communication module — this is a standalone line-protection breaker.