The Schneider Electric A9F68325 is a 3-pole Acti9 iT60 miniature circuit breaker rated at 25 A with a C curve, built for distribution boards on DIN rail.
The A9F68325 delivers 36 kA Icu at 12–133 V AC, 20 kA Icu at 220–240 V AC, and 10 kA Icu at 380–415 V AC per IEC 60947-2. That 20 kA at 240 V is the number most panel builders care about for a 25 A C-curve MCB in a North American or European distribution board — it means this breaker can safely interrupt a 20,000 A fault without welding its contacts or bursting the case. At 400 V, the Icn per IEC 60898-1 is 10 kA, which covers the standard domestic/commercial fault level. The utilisation category is A, so it's not intended for motor switching under load — use a contactor for that.
What the C curve and thermal-magnetic trip mean on the route
The thermal-magnetic trip unit handles overloads (thermal bimetal) and short-circuits (solenoid) in one package. Magnetic tripping limit is 8 x In, so at 25 A that's 200 A instantaneous trip — fast enough to protect wiring but tolerant of the inrush from a small motor or a bank of contactor coils. The thermal element is tropicalised to class 2 per EN/IEC 60068-2-78, meaning it holds up in high-humidity environments without nuisance tripping from corrosion on the bimetal.
Snaps onto DIN rail, 54 mm wide (6 x 9 mm pitches). Terminals accept 1–25 mm² rigid or 1–16 mm² flexible copper, with a tightening torque of 2 N·m. The removable comb busbar is installed from the factory — you can daisy-chain the line side across multiple breakers without extra wiring. Pollution degree 3 per IEC 60947-2, meaning it's rated for conductive dust and condensation typical in industrial enclosures.