The Schneider Electric A9N1P04DIN is an Acti9 xC60 miniature circuit breaker (MCB) rated at 4 A with a D tripping curve, single-pole construction, and a breaking capacity of 10 kA Icu at 220–240 V AC 50/60 Hz per IS/IEC 60947-2. The 10 kA Icu at 240 V AC is the maximum fault current the breaker can safely interrupt without welding its contacts; for a 4 A branch circuit in a distribution panel, that leaves substantial headroom over typical fault levels in most commercial installations.
Clip-on mounting to a standard 35 mm DIN rail and 18 mm width per pole — two 9 mm pitches — so this single-pole breaker occupies one module position in a distribution board. Depth of 77.5 mm and height of 85 mm fit within a standard 125 mm deep enclosure; the white housing with toggle control and ON/OFF local indication makes visual status checks fast during commissioning. Tunnel-type terminals accept up to 25 mm² rigid or 16 mm² flexible conductors; tightening torque is 2 N·m, and wire stripping length is 13 mm for top or bottom connection. IP20 finger-safe protection is sufficient for enclosed panel use.