The Schneider Electric A9F03310 is a 3-pole miniature circuit breaker from the Acti9 iC60N range, rated 10 A with a B-curve trip characteristic. The 36 kA Icu at 12…133 V AC (per EN/IEC 60947-2) tells you it can safely interrupt a fault current up to 36 kA at those low voltages; at 220…240 V AC the rating drops to 20 kA, and at 380…415 V AC to 10 kA. The part also carries a 6 kA Icn at 400 V per EN/IEC 60898-1, which is the standard household/commercial breaking capacity for that standard.
The 78.5 mm depth and 91 mm height are standard for the iC60N family, so it aligns with busbars and neighbouring devices in an Acti9 distribution board. Terminals accept 1…25 mm² rigid or 1…16 mm² flexible wire; strip length is 14 mm, torque to 2 N·m.
The thermal-magnetic trip unit provides both overload (thermal) and short-circuit (magnetic) protection. A separate earth-leakage protection block can be added if needed.