The Schneider Electric A9F68440 is a 40 A, C-curve, 4-pole miniature circuit-breaker from the Acti9 iT60 line, designed for distribution panels on DIN rail. At 220…240 V AC the breaking capacity is 20 kA, and at 380…415 V AC it drops to 10 kA; the 6 kA rating at 440 V AC covers the upper end. The thermal-magnetic trip unit with C curve (magnetic threshold 8 x In ±20 %) is sized for general-purpose distribution loads — lighting, small motor circuits, control transformers — where inrush isn't extreme but a standard B curve would nuisance-trip.
The removable comb busbar is already installed, which speeds up panel wiring when ganging multiple breakers. Terminals accept 1…35 mm² rigid or 1…25 mm² flexible; wire stripping length is 14 mm, and tightening torque is 3.5 N.m.