The Schneider Electric A9F05216 is a 16 A, D-curve, 2-pole miniature circuit-breaker from the Acti9 iC60N series, built for distribution panels. It sits on a DIN rail, takes up 36 mm (4 x 9 mm pitches), and is rated for both AC and DC networks at 50/60 Hz. The D curve means its magnetic trip fires at 12 x In (±20%), so it handles high inrush currents typical of motor loads, transformers, or discharge lighting without nuisance tripping. For a 16 A breaker, that's around 192 A instantaneous trip threshold. Breaking capacity is the headline: 36 kA Icu at 12-133 V AC, 20 kA at 220-240 V, 10 kA at 380-415 V, and 6 kA at 440 V — all per IEC 60947-2. It also carries a 10 kA Icn at 400 V per IEC 60898-1.
The 36 mm width (2-pole) fits a typical 4-module slot in a consumer unit or distribution board. Terminals accept 1-25 mm² rigid or 1-16 mm² flexible, with a double-terminal design for daisy-chaining or ring-feed. Torque to 2 N·m, strip 14 mm.
Dual-certified to both IEC 60898-1 (the household/industrial MCB standard) and IEC 60947-2 (the industrial circuit-breaker standard). That dual rating gives it a wider acceptance for both residential and industrial specs. Also carries the isolation suitability mark per both standards — you can use it as a disconnector.