The Schneider Electric A9N3P50CGN is a 50 A, 3-pole miniature circuit breaker from the Acti9 xC60 family, built to IS/IEC 60898-1 for AC distribution in residential and light commercial panels.
Rated breaking capacity is 10 kA Icn at both 240 V and 415 V AC per IS/IEC 60898-1. That 10 kA figure is the same at both voltage levels, so you don't have to derate the interrupting rating when the breaker is used on a 415 V three-phase feed — it holds the full 10 kA across the rated voltage range of 220–240 V and 380–415 V AC. Overvoltage category IV means it's rated for the main distribution board, not just sub-panels, so it can sit at the service entrance where fault currents are highest.
Width is 54 mm (6 x 9 mm pitches), depth 77.5 mm, height 85 mm — standard 3-pole MCB footprint for a DIN-rail enclosure.
Designed and tested to IS/IEC 60898-1 for overcurrent protection in household and similar installations. Earth-leakage protection requires a separate block — this is a plain MCB, not an RCBO.