What the ratings mean for fit
The 80 A Iu rating is the breaker's continuous current at 40 °C ambient — that's the number you match to your feeder or load current, not the interrupting rating. For a 3-pole line protection MCCB, you're using it as a main or branch breaker in a 400 VAC distribution panel, sized for an 80 A circuit. It ships with a shunt trip (STL) for remote tripping, plus two auxiliary switches (HQ) for status feedback to a PLC or annunciator. No undervoltage release, no ground-fault module, no communication stack — this is a straightforward thermal-magnetic breaker, not an electronic trip unit. If you need communication or ground-fault protection, you're looking at a different variant in the 3VA family. The integrated auxiliary trip order code is 3VA9688-0BL30 — that's the specific accessory that mates with this breaker for shunt-trip wiring. If your BOM already calls that out, the fit is direct.
Panel integration and mounting
The breaker measures 130 mm high, 76.2 mm wide, and 70 mm deep — a standard 3-pole MCCB footprint that fits most DIN-rail or screw-mount panel layouts. IP40 on the front means it's protected against solid objects over 1 mm but not sealed against dust ingress; keep it inside a closed enclosure in dirty environments. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C.