The Schneider Electric A9N60745 is an Acti9 C120N miniature circuit breaker — a thermal-magnetic MCB rated 80 A at 40 °C, single-pole, with a D trip curve. The D curve means magnetic tripping occurs at 12 x In (±20 %), so it handles high inrush loads like motor starters and transformer primaries without nuisance trips on startup. Breaking capacity is 10 kA Icu at 230-400 V AC 50/60 Hz per EN/IEC 60947-2, which covers most distribution panel fault levels in commercial and light industrial installations.
Clip-on mounting on 35 mm symmetrical DIN rail — standard for any distribution board or sub-panel. At 27 mm wide (3 x 9 mm pitches), it occupies one module position. Tunnel terminals accept 1-50 mm² rigid or 1.5-35 mm² flexible; strip length 15 mm, torque to 3.5 N·m. IP20 finger-safe front, pollution degree 3, overvoltage category III — fits inside a closed enclosure.