The A9N3P50DGN is a 3-pole Acti9 xC60 miniature circuit breaker rated at 50 A with a D tripping curve (magnetic trip 10–14 × In). It clips onto a 35 mm DIN rail and occupies 6 × 9 mm pitches (54 mm width), so it fits standard distribution boards with a 77.5 mm depth that clears most enclosure gland plates.
Breaking capacity is 10 kA Icn at both 240 V and 415 V AC, 50/60 Hz, per IS/IEC 60898-1. That 10 kA rating at the higher 415 V line is the figure that governs fault clearance in a 415/240 V three-phase distribution board — it means the breaker can safely interrupt a bolted fault up to 10 kA without welding contacts or cascading upstream. The limitation class is 3 per the same standard, which limits let-through energy enough to protect downstream equipment in a properly coordinated panel. Overvoltage category IV and pollution degree 3 confirm it is rated for the main incoming supply side, not just sub-circuits.