The Schneider Electric A9KF71463 is a 63 A, 4-pole miniature circuit breaker from the Acti9 K60 series, with a C-curve trip characteristic and a 10 kA breaking capacity at 415 V AC per EN/IEC 60898-1.
The C-curve means magnetic tripping occurs between 5 and 10 times In (315–630 A), making it suitable for circuits with moderate inrush — typical for general-purpose distribution, lighting banks, and small motor groups where the start-up surge is not extreme. This rating, verified to EN/IEC 60898-1, means it can clear a short-circuit up to 10,000 A without welding contacts or failing — adequate for most commercial and light industrial sub-distribution boards where the prospective fault current at the panel is known to be below that threshold. This is a practical advantage for selectivity coordination with downstream MCBs.
The 4-pole unit occupies 8 module pitches (144 mm) on a standard DIN rail. The tunnel-type terminals accept up to 35 mm² rigid or 25 mm² flexible conductors, with a tightening torque of 3.5 N.m. The IP20 front face protects against accidental finger contact, standard for enclosed distribution boards.