The Schneider Electric A9N21369 DT40N is a 32 A miniature circuit breaker with a C-curve (magnetic trip 5–10 × In), 1P+N poles, and a dual-rated breaking capacity: 6000 A Icn at 230 V AC per EN/IEC 60898-1 for residential/commercial distribution, and 10 kA Icu at 230–240 V AC per IEC 60947-2 for industrial panel duty. The 1P+N configuration protects the live pole only; the neutral pole is switched but not protected, so it fits single-phase sub-circuits where neutral isolation is needed but overcurrent protection on the neutral is not required.
Clip-on mounting to DIN rail (EN 60715) with a 2-pitch (9 mm) footprint — 18 mm wide per pole, so the 1P+N unit occupies 2 modules. ON/OFF local signalling via toggle gives immediate visual status during commissioning or fault tracing.
