The Schneider Electric A9D42640 is an Acti9 iDPN Vigi RCBO — a combined overcurrent and residual-current device in a single 1P+N module, rated 40 A with a C-curve trip characteristic and 300 mA earth-leakage sensitivity. Breaking capacity is 6000 A Icn at 230...240 V AC, 50 Hz, per EN/IEC 61009-2-1 — sufficient for most residential and light commercial final circuits where the prospective short-circuit current stays under that threshold.
The 300 mA earth-leakage sensitivity is a deliberate choice: it provides protection against insulation faults and fire risk without the nuisance tripping that a 30 mA device can cause on long cable runs or equipment with natural leakage. That makes this RCBO a fit for distribution sub-circuits feeding fixed equipment, not for socket-outlet circuits where 30 mA is the standard for personal protection. The 40 A rating and 6 kA breaking capacity align with typical final-circuit protection in a domestic or small commercial distribution board.
Tightening torque 2 N.m, strip length 15 mm. The 9 mm pitch between phase and neutral matches the standard Acti9 busbar pitch — no adapters needed for a common feed. Local signalling shows ON, OFF, and fault-trip status on the toggle, so a quick visual check confirms whether the device has tripped on overcurrent or earth leakage. Mechanical durability is rated at 20000 cycles, electrical at 10000 cycles — adequate for routine switching in a distribution role, though not intended for frequent load-break duty.