The Schneider Electric A9N19862 is an Acti9 C120L miniature circuit breaker — 3-pole, 125 A rated current at 30 °C, D-curve thermal-magnetic trip, with a 15 kA breaking capacity at 400 V AC.
This part is officially obsolete per the manufacturer. If you're designing a new panel, the Acti9 range still carries active 3P 125 A D-curve MCBs; check the latest catalog for the current order code that matches your duty.
The same 15 kA Icu under IEC 60947-2 means it also meets the industrial standard for isolation and performance after fault interruption. The 125 A rating at 30 °C is the continuous current; derate for higher ambient temps per the thermal curve. The D-curve magnetic trip at 10–14× In (1,250–1,750 A instantaneous) is the key selection parameter for motor or transformer primary protection — it avoids nuisance trips on inrush while still clearing short circuits fast enough for cable protection.
Panel Integration & Compliance
Mounts on standard DIN rail via clip-on, 9 mm pitch per pole — 3 poles means 27 mm of rail width. The toggle handle gives local ON/OFF indication and a contact position indicator for isolation verification (suitable for isolation per the spec). Tunnel terminals accept 1–50 mm² rigid or 1.5–35 mm² flexible, torqued to 3.5 N·m. Compliance covers GB 10963.1, EN/IEC 60898-1, GB/T 14048.2, and EN/IEC 60947-2 — so it's accepted in both residential-distribution (60898) and industrial (60947) applications across Europe, China, and markets that follow those standards. Rated insulation voltage 500 V AC, impulse withstand 6 kV.