What this MCB does for your panel
The Schneider Electric A9F04320 is a 3-pole Acti9 iC60 miniature circuit breaker rated at 20 A with a C-curve trip characteristic. Breaking capacity reaches 36 kA Icu at 12–133 V AC, 20 kA at 220–240 V, and 10 kA at 380–415 V AC per EN/IEC 60947-2. At 400 V AC under EN/IEC 60898-1 it delivers 10 kA Icn. That SCCR headroom lets you coordinate downstream without cascading upstream — useful for a panel feeding multiple sub-distribution boards.
Occupies 6 × 9 mm pitches (54 mm wide) — a compact 3-pole footprint for a 20 A device. Height 91 mm, depth 78.5 mm — fits most enclosure depths without crowding the gland plate. Tightening torque 2 N·m; strip length 14 mm. Spring-cage or screw? Toggle control, so it's a manual-break switch with a trip indicator and contact position indicator for safe isolation verification.