The Schneider Electric A9TDFC640 is an Acti9 Active iCV40N ARC residual-current circuit breaker with integral overcurrent protection (RCBO), rated 40 A, 1P+N, C-curve. The 73 mm depth and 91 mm height fit standard Acti9 enclosures.
The 40 A rated current (In) and C-curve trip characteristic mean this RCBO handles general-purpose loads like lighting, socket circuits, and small motor starters where inrush is moderate — the C-curve holds through 5–10x In magnetic trips, so it won't nuisance-trip on a motor start or capacitor bank. Breaking capacity is 6 kA Icn at 230 V AC per EN/IEC 61009-2-1, and 10 kA Icu per EN/IEC 60947-2. The 6 kA Icn is the rated short-circuit capacity for the RCBO standard; the 10 kA Icu is the ultimate breaking capacity under the higher industrial standard. For a domestic or commercial board with a typical prospective fault current under 6 kA, this is adequate. If your site has a transformer close to the board and fault levels exceed 6 kA, the 10 kA Icu rating gives headroom — but selectivity with the upstream device still needs coordination. The thermal-magnetic trip unit is standard for RCBOs: the thermal bimetal protects against sustained overloads, the solenoid trips on short-circuit. The device also provides arc-fault detection (the 'ARC' in the name), monitoring the waveform for series and parallel arc faults that a standard MCB or RCBO would not detect. This addresses the fire risk from damaged cables or loose connections. Local signalling includes a fault-trip LED and an arc-fault diagnostic LED, so a panel builder or maintenance tech can tell at a glance whether the trip was from overload, earth leakage, or an arc event.
This RCBO is designed for final distribution circuits in residential, commercial, and light industrial buildings — think lighting, general-purpose sockets, small HVAC units, and vending machines. The clip-on DIN-rail mounting and 36 mm width (4 modules) mean it slots directly into a standard Acti9 distribution board alongside other Acti9 devices like MCBs, RCCBs, and surge arrestors. The white (RAL 9003) finish matches the rest of the Acti9 range for a clean panel appearance.
The device carries AENOR quality certification and complies with EN/IEC 62606 (arc-fault detection devices), EN/IEC 61009-1 (RCBOs), EN/IEC 60947-2 (circuit-breakers), and EN/IEC 61009-2-1 (RCBOs for household and similar installations). Pollution degree 2 per EN/IEC 62606, overvoltage category III, and tropicalisation severity B per IEC 60068-2-30 for 28 days — meaning it withstands 95 % relative humidity at 55 °C without degradation. Operating altitude is rated to 2000 m.