The Schneider Electric A9N4P20CIN is a 4-pole miniature circuit breaker from the Acti9 xC60 range, rated 20 A with a C curve and a breaking capacity of 10 kA at 380–415 V AC (IS/IEC 60947-2).
Ratings that matter for panel fit
Breaking capacity is 10 kA Icn at 380–415 V AC 50/60 Hz and 6 kA Icu at 220–250 V DC, both per IS/IEC 60947-2. The IP20 finger-safe terminals are fine inside a closed cabinet but not for washdown areas. Mechanical and electrical durability are both rated at 20,000 cycles. That's typical for a panelboard MCB — enough for years of occasional switching, but not for a frequent on/off duty cycle like a motor starter contactor would see.
Tightening torque 2 N·m. The biconnect terminal design lets you daisy-chain the outgoing side without a separate busbar — saves a step in panel wiring.