The Schneider Electric A9F68410 is an Acti9 iT60 miniature circuit breaker rated at 10 A with a C-curve magnetic trip characteristic, 4 poles, and a 72 mm width for DIN-rail mounting in distribution panels.
The breaking capacity table is the main thing to check against your fault study. At 220…240 V AC this breaker interrupts 20 kA Icu per EN/IEC 60947-2, and at 380…415 V AC it holds 10 kA Icu. The IEC 60898-1 rating is 10 kA Icn at 400 V AC. If your calculated fault level sits above 10 kA at 400 V, this breaker still coordinates because the 60947-2 Icu at that voltage is the same 10 kA — no hidden gap. The 36 kA Icu at 12…133 V AC is a low-voltage edge case for control transformers or battery-backed DC buses.
Trip curve and coordination
C-curve means the magnetic trip fires at 8 x In ±20 %, so for this 10 A breaker the instantaneous trip threshold sits between 64 A and 96 A. That suits general-purpose distribution loads — lighting, small motor starters, control transformers — where the inrush is moderate but not as high as a motor-starting D-curve would handle. The limitation class is 3 per EN/IEC 60898-1, meaning it limits let-through energy enough to protect downstream wiring under short-circuit conditions without cascading the trip upstream. Thermal-magnetic trip unit, no earth-leakage module built in.
Snaps onto DIN rail, 72 mm wide (8 x 9 mm pitches). The removable comb busbar is installed from the factory, so you can daisy-chain phases across adjacent breakers without extra wiring. Terminals accept 1…25 mm² rigid or 1…16 mm² flexible on top or bottom; strip length 14 mm, torque to 2 N·m.