The 3ABD00047425-D: Three duty curves are listed: normal-use (Pn 4 kW, In 9.4 A), heavy-duty (PhD 3.0 kW, IhD 7.2 A), and light-overload (PlD 4.0 kW, IlD 8.9 A). The heavy-duty curve handles a motor that needs torque margin for short peaks, say a centrifuge or a conveyor start. Light-overload sits between them, useful when the duty cycle is intermittent but not severe. Pick the curve that matches your driven load's actual profile, not the highest number.
IP21 and NEMA Type 1 enclosure suits indoor, clean-area installations — think a motor control center or a mechanical room. Wall-mounted, so plan for a vertical surface with clearance for airflow; the frame R1 footprint is compact enough for retrofit into existing panel space.