Breaking capacity hits 330 kA at 240 V, 242 kA at 415 V, and 187 kA at 500 V — numbers that matter when you're protecting a transformer secondary or a main feeder in a high-fault panel.
Thermal derating and power loss — real panel conditions
At 50 °C it's 593 A; at 60 °C it's 557 A; at 70 °C it's 520 A. Maximum power loss is 162 W, which is the heat you need to vent.
The ETU320 electronic trip unit handles line protection (no ground-fault or voltage-trip built in). It ships with 4 HQ auxiliary switches (order code 3VA9608-0BB24 for the integrated auxiliary trip). No undervoltage release, no communication module, no phase-failure detection — this is a straightforward thermal-magnetic replacement for basic overcurrent protection. The supplied basic switch is 3VA2463-7HL32-0AA0.