The Schneider Electric A9N3P04DIN is a 3-pole miniature circuit breaker from the Acti9 xC60 range, rated 4 A with a D tripping curve. The D curve's magnetic trip threshold is 12 x In ±20 %, meaning it holds through motor inrush and high-surge loads without nuisance tripping — suited for distribution circuits feeding inductive equipment like small motors or transformers. Breaking capacity is 10 kA Icn at 380–415 V AC 50/60 Hz per IS/IEC 60947-2, and 15 kA Icu at 100–125 V DC. Clip-on mounting to 35 mm DIN rail, 54 mm wide (6 x 9 mm pitches), IP20 finger-safe terminals.
Mechanical and electrical durability both rated at 20,000 cycles — consistent with a distribution MCB that sees infrequent manual switching. The toggle provides local ON/OFF indication.