The Schneider Electric A9P42616 is a 1P+N miniature circuit-breaker from the Acti9 iC40 range, rated 16 A with a B tripping curve. Thermal-magnetic trip technology means the thermal bimetal handles sustained overloads and the solenoid handles short-circuit faults. Breaking capacity is 6 kA Icu at 230 V AC per EN/IEC 60947-2, and 4500 A Icn at 230 V AC per EN/IEC 60898-1 — that dual rating tells you it meets both the industrial (60947-2) and domestic (60898-1) standards, so it can sit in a residential consumer unit or a light-industrial subpanel. Limitation class 3 per 60898-1 means it limits let-through energy enough to protect downstream wiring under fault conditions.
Clip-on mounting to DIN rail, 2 × 9 mm pitches wide (18 mm total) — standard 1P+N width. Neutral is on the left, which matters when you're laying out a row of MCBs and need the busbar alignment to match. Tunnel terminals accept 1–16 mm² rigid or 1–10 mm² flexible; strip length 14 mm, torque to 2 N·m. IP20 finger-safe on the front face; IP40 inside the modular enclosure once it's boxed.