The Schneider Electric A9F05210 is an Acti9 iC60N miniature circuit breaker rated 10 A with a D tripping curve, 2 poles, and a 36 kA Icu breaking capacity at 12–133 V AC.
The 36 kA Icu at 12–133 V AC drops to 20 kA at 220–240 V and 10 kA at 380–415 V. That 10 kA at 400 V matches the Icn under 60898-1, so the breaker is coordinated for a standard 10 kA prospective fault level at 400 V three-phase. The 6 kA Icu at 440 V AC covers the upper end of the 400 V tolerance band.
Snaps onto a 36 mm wide DIN rail — that's 4 module pitches (9 mm each). The double terminals accept 1–25 mm² rigid or 1–16 mm² flexible copper, with a 14 mm strip length and 2 N·m tightening torque. The toggle actuator and trip indicator give local status; the contact position indicator confirms isolation (certified per both standards).