The A9DC4625 is a Schneider Electric Acti9 iCV40H residual current circuit breaker with overcurrent protection (RCBO) — a single module that combines a 25 A thermal-magnetic MCB with a 30 mA earth-leakage trip in one DIN-rail housing. It's a 1P+N device, meaning it switches the live conductor and monitors the neutral, with the neutral on the left side of the unit.
Breaking capacity is 10 kA Icn at 230 V AC, 50/60 Hz, per EN/IEC 61009-2-1. The 30 mA earth-leakage sensitivity provides personal protection against indirect contact and ground faults. It's the standard threshold for socket-outlet circuits in most IEC-based codes (BS 7671, VDE 0100, etc.) — fast enough to clear a fault before it becomes lethal. The RCBO trips on both overcurrent and residual current, so a single device covers branch-circuit protection and earth-fault protection, saving a DIN rail position compared to a separate MCB + RCCB pair. Thermal-magnetic trip technology means the thermal bimetal handles overloads (slow, inverse-time) and the solenoid handles short-circuits (instantaneous). The C-curve's 5–10 x In magnetic threshold is a good match for circuits with moderate inrush — think fluorescent lighting, small pumps, or general-purpose power outlets. For highly inductive loads like large motors, a D-curve would be more appropriate; for purely resistive loads, a B-curve gives tighter protection.
Clip-on mounting to DIN rail (35 mm per EN 60715). The housing is 36 mm wide (4 x 9 mm pitches), so it occupies four modular spaces on the rail. Tunnel-type terminals top and bottom accept 1–16 mm² rigid or 1–10 mm² flexible cable; strip 14 mm and tighten to 2 N·m. The connection pitch between phase and neutral is 9 mm, which aligns with standard busbar systems in Acti9 distribution boards. IP20 for the device body (finger-safe), IP40 for the modular enclosure when installed in a suitable cabinet — fine for dry indoor panels.