The heavy-duty rating (55 kW, 61 A) applies to variable-torque loads such as centrifugal pumps or fans where overload capacity is needed. The light-overload rating (75 kW, 80 A) sits close to normal use, indicating the drive can handle moderate overloads without derating. For a motor nameplated at 75 kW, confirm the actual running current stays under 84 A continuous; if the load profile includes frequent peak demands, the 61 A heavy-duty figure governs the selection.
Wall-mounted with an IP21 rating — suitable for indoor, dry environments where dripping water is not a concern. Frame R6 is a compact footprint for the power level; verify gland-plate clearance and cable bend radius against the panel layout before cutting the backplate.