The A9K23116 is a Schneider Electric Acti9 iK60N miniature circuit-breaker — a 1-pole, 16 A, B-curve thermal-magnetic MCB rated for AC distribution per EN/IEC 60898-1. If the panel ambient runs higher, derate per the manufacturer's curve. The 440 V AC rated insulation voltage (Ui) confirms the breaker is suitable for 230/400 V networks, though the breaking capacity is declared at 230 V only.
Width is 18 mm (2 x 9 mm pitches), so it occupies one standard module position. Depth of 78.5 mm and height of 85 mm — verify enclosure depth clearance, particularly in shallow gland-plate or door-mount panels. Tunnel terminals accept 1 to 25 mm² rigid or 1 to 16 mm² flexible; tighten to 2 N·m. Strip length 14 mm.
