The Schneider Electric A9N1P04DGN is a 1-pole miniature circuit breaker from the Acti9 xC60 range, rated 4 A with a D tripping curve. It clips onto a standard 35 mm DIN rail inside a distribution board — the 18 mm width (2 x 9 mm pitches) matches the modular grid of a residential or light commercial panel. The D curve means its magnetic trip operates at 10 to 14 times the rated current (40 to 56 A instantaneous), which is the right characteristic for loads with a high inrush — think small transformers, solenoid valves, or motor starters where a B or C curve would nuisance-trip on startup. For a 4 A device, that inrush tolerance is the main selection criterion.
Breaking capacity and standards
Rated breaking capacity is 10,000 A Icn at 240 V AC, 50/60 Hz, certified to IS/IEC 60898-1. Tropicalisation class 2 per IEC 60068-1 covers damp heat; the 95 % RH at 55 °C rating confirms it holds up in high-humidity environments without internal tracking.
Termination and wiring
The IP20 finger-safe front is standard for enclosed distribution boards.