The Schneider Electric A9N16263 is an Acti9 xID residual current circuit breaker (RCCB) — a 4-pole, Type AC device rated for 80 A continuous current with 300 mA earth-leakage sensitivity. It operates on 400-415 V AC, 50 Hz networks and clips onto a DIN rail for panel mounting. The 300 mA sensitivity is the standard threshold for general-purpose socket-outlet and lighting circuits in commercial and industrial distribution boards, providing personnel protection against indirect contact while avoiding nuisance tripping on small leakage currents typical of permanently connected equipment.
Mounts via clip-on to DIN rail — 72 mm wide, 81 mm tall, 75 mm deep. The 4-pole unit occupies 8 module pitches (9 mm each) on the rail. Neutral is on the left. Tunnel-type terminals accept 1-35 mm² rigid or 1-25 mm² flexible cable; tighten to 3.5 N·m top or bottom.
Rated breaking and making capacity is 800 A conforming to EN/IEC 61008-1 — sufficient for clearing downstream faults in a residential or light commercial distribution board. Electrical and mechanical durability are both rated at 4000 cycles. The device is suitable for isolation (visible contact gap), with a contact position indicator and padlocking provision. Pollution degree 2 for normal industrial environments.