The interrupting ratings tell the real story: 330 kA at 240 V, 242 kA at 415 V, 242 kA at 440 V, 187 kA at 500 V, and still 52.5 kA at 690 V. For a 400 A main breaker in an industrial panel, that's the kind of SCCR that keeps the series rating simple. The electronic trip unit is an ETU350, which gives you adjustable long-time, short-time, instantaneous, and ground-fault protection curves. That matters when you're coordinating with downstream feeders and don't want nuisance trips on motor-start inrush. The undervoltage release (UVR) is built in — it drops the breaker if control power fails, which is a common spec for emergency-stop and safety circuits.
At 55 °C it's 385 A, at 60 °C it's 370 A, at 65 °C it's 355 A, and at 70 °C it's 340 A. If your panel runs hot, that derating curve is what you use to size the breaker correctly, not the 400 A nameplate. The integrated auxiliary trip is order code 3VA9608-0BB24.
Maximum power loss is 98.5 W at rated current — that's the heat you need to vent from the enclosure. It's not a number you see on every listing, but for a panel builder it decides whether you need forced ventilation or a bigger cabinet. Latching endurance is rated at 15,000 operations, which is typical for a main breaker that sees infrequent switching. That covers unheated warehouses and outdoor enclosures in most climates. The -40 °C storage minimum is the limit for cold-weather shipping and storage — don't let it sit in a frozen truck for weeks.