The A9D41640 is a 1P+N residual-current circuit breaker with overcurrent protection (RCBO) from the Acti9 iDPN Vigi range, rated 40 A with a C curve (magnetic trip 5–10× In) and integrated 300 mA earth-leakage protection. The 6 kA breaking capacity at 230–240 V AC meets EN/IEC 61009-2-1 for residential and light commercial distribution boards — enough for most final circuits but not for high-fault industrial panels where 10 kA or higher is specified. The 40 A rating and C curve suit general-purpose socket outlets, lighting, and small appliance circuits where inrush from switching supplies or motor starts is moderate. The thermal-magnetic trip unit handles overloads (thermal) and short-circuits (magnetic) in one compact 1P+N package, with the neutral switched and protected. At 300 mA sensitivity it is a fire-protection device, not personnel protection (30 mA would be required for that). The 10000-cycle electrical and 20000-cycle mechanical durability are standard for this class — fine for normal switching duty, but if this RCBO sees frequent manual toggling as a disconnect, the mechanical rating is the one to watch.
Clip-on mounting to DIN rail, 36 mm width (4 × 9 mm pitches), with a 9 mm phase-to-neutral connection pitch. IP20 rated (IP40 in a modular enclosure) — fine for a distribution board, not for wet or dusty locations. Terminals accept 1–16 mm² rigid or 1–10 mm² flexible, with a 2 N·m tightening torque and 15 mm strip length. The toggle gives clear ON, OFF, and fault-trip local indication — useful for a panel builder or maintenance tech checking a tripped circuit without opening the cover.
For a maintenance-spares purchaser, this is a part to keep one in the cabinet for a legacy install — the 300 mA sensitivity and C-curve combination is common in older distribution boards, and while the range remains active, stocking a spare avoids a downtime chase when a final-circuit RCBO trips and won't reset.