The Schneider Electric A9N1P16CGN is an Acti9 xC60 miniature circuit breaker — 1-pole, 16 A rated current, C-curve trip characteristic. It clips onto a 35 mm DIN rail, occupying two 9 mm pitches (18 mm wide). The thermal-magnetic trip unit handles distribution circuits in residential and light commercial panels, with a breaking capacity of 10,000 A Icn at 240 V AC per IS/IEC 60898-1. That rating means it can safely interrupt a fault current up to 10 kA without welding contacts or cascading failure upstream.
What the ratings mean for your panel
The C-curve (magnetic trip 5...10 × In) is the standard choice for general-purpose distribution — it handles inrush from small motors, transformers, and lighting ballasts without nuisance tripping, while still clearing short-circuit faults fast enough for cable protection. The 16 A rating on a 1-pole breaker suits final subcircuits feeding socket outlets, lighting, or small equipment on a 220–240 V AC network. Pollution degree 3 and overvoltage category IV mean the breaker is rated for the harsh conditions inside a distribution board — conductive dust, humidity, and direct connection to the mains supply where transient overvoltages can reach several kV. The tropicalisation treatment (2 conforming to IEC 60068-1) adds resistance to heat and humidity cycling, so this MCB holds up in non-conditioned environments. IP20 protection on the front means it is touch-safe for the panel interior but not rated for wet or outdoor exposure. The tunnel-type terminals accept up to 25 mm² rigid or 16 mm² flexible cable; the biconnect feature allows daisy-chaining without pigtails. Tightening torque is 2 N·m — a standard value for this terminal class, no special tool needed.