The Schneider Electric A9F05370 is an Acti9 iC60 miniature circuit-breaker (IC60N) rated at 0.5 A with a D tripping curve. It protects a 3-pole AC distribution circuit, and the D-curve magnetic trip at 12 x In (±20%) means it handles high inrush loads like small transformers or motor starters without nuisance tripping — the right call for a motor control panel or industrial machine supply.
Snaps onto DIN rail (6 x 9 mm pitches), occupies 54 mm width. IP20 rated — panel-internal use, not washdown.
Breaking capacity is 50 kA Icu at 220…240 V and 380…415 V AC per EN/IEC 60947-2, dropping to 25 kA at 440 V and 10 kA Icn at 400 V per EN/IEC 60898-1. That 50 kA rating at common industrial voltages gives solid SCCR headroom for a panel fed from a transformer of moderate size — you can coordinate downstream without cascading upstream.
Rated insulation voltage 500 V AC, overvoltage category IV, pollution degree 3. Suitability for isolation confirmed to both standards — the toggle and contact position indicator give a visible air gap when off. Separate earth-leakage block can be added alongside if needed.