The heavy-duty rating (7.5 kW, 17 A) applies when you need sustained overload capability — think crushers, mixers, or hoists that draw more current during start or jam conditions. If your motor nameplate sits between these curves, size to the heavy-duty column to avoid nuisance trips.
Installation notes
Wall-mount only — no DIN-rail option. IP21 means no washdown tolerance; keep it in a cabinet or dry machine bay. NEMA 1 knockouts accept standard conduit. Frame R2 determines gland-plate layout and minimum side clearance per the manual. Input voltage range 380–415 V three-phase covers most European and Asian industrial supplies; the 47.5–63 Hz frequency tolerance handles weak grids or generator feeds.