The Schneider Electric A9F68406 is a 6 A, 4-pole miniature circuit breaker from the Acti9 iT60 series, with a C-curve trip characteristic.
Breaking capacity varies by voltage: 36 kA Icu at 12…133 V AC, 20 kA at 220…240 V, 10 kA at 380…415 V, and 6 kA at 440 V, all per EN/IEC 60947-2. Under EN/IEC 60898-1 it is rated 10 kA Icn at 400 V. The 36 kA figure at low voltage is useful for high-fault panels where the upstream transformer is close; at 400 V the 10 kA Icu still covers most European commercial installations.
Snaps onto DIN rail, 72 mm wide (8 x 9 mm pitches). Terminals accept 1…25 mm² rigid or 1…16 mm² flexible, with a tightening torque of 2 N·m. The removable comb busbar is pre-installed, so daisy-chaining phases across a row of MCBs is straightforward — no extra busbar to order for the common feed. IP20 finger-safe terminals, pollution degree 3, overvoltage category IV.