The Schneider Electric A9N3P20CIN is a 3-pole miniature circuit breaker from the Acti9 xC60 family, rated 20 A with a C-curve trip characteristic.
Breaking capacity and standards
Rated breaking capacity is 10 kA Inc at 380–415 V AC, 50/60 Hz, and 15 kA Icu at 100–125 V DC, both per IS/IEC 60947-2. The DC rating matters for battery-backed or solar-string circuits — 15 kA at 125 V DC is generous for a 20 A frame. Limitation class 3 means it limits let-through energy well, so downstream equipment sees less thermal stress during a short circuit.
Mounting and connections
Width is 54 mm (6 x 9 mm pitches). The biconnect terminal allows two conductors per pole, handy for daisy-chaining. IP20 finger-safe terminals, so it's fine inside an enclosed panel but not for wet environments.
Environmental and durability
Mechanical and electrical endurance is 20,000 cycles each, which is standard for a distribution MCB.