The Schneider Electric A9F68140 is an Acti9 iT60 miniature circuit breaker rated for 40 A continuous current with a C-curve trip characteristic (magnetic trip at 8 x In ±20%). It's a single-pole unit, DIN rail mounted, and carries a 36 kA breaking capacity at 12-60 VAC under IEC 60947-2 — enough to handle high-fault industrial panels without cascading upstream.
The 36 kA Icu at 12-60 VAC (per IEC 60947-2) is the headline number here — that's a serious interrupt rating for a 1P MCB. At 220-240 VAC it still holds 10 kA, and at 230 VAC the Icn per IEC 60898-1 is 6 kA. The dual standard compliance (both 60947-2 and 60898-1) means it's rated for both industrial and residential/commercial distribution, so you can use it on either side of the meter without swapping part numbers.
Snaps onto DIN rail, 18 mm wide (2 x 9 mm pitches). Terminals accept 1-35 mm² rigid or 1-25 mm² flexible, with a 14 mm strip length and 3.5 N·m torque. The removable comb busbar is pre-installed — common on Acti9 panels, so you can daisy-chain phases without extra hardware. IP20B finger-safe when installed in an enclosure.