The Schneider Electric A9R22240 is an Acti9 iID residual current circuit breaker (RCCB) — 2 poles, rated 40 A, with 100 mA earth-leakage sensitivity and Type A protection. It clips onto a DIN rail, occupies 4 x 9 mm pitches (36 mm wide), and is rated for 230/240 V AC 50/60 Hz networks. The instantaneous trip is voltage-independent, so it clears a fault even if the line voltage drops.
The 40 A continuous rating (In) and 1500 A making/breaking capacity (Idm/Im) cover most residential and light commercial outgoing circuits — think final subcircuits feeding socket outlets, lighting, or small loads. The 100 mA sensitivity is less sensitive than the common 30 mA; it's chosen where nuisance tripping from cable leakage or equipment inrush is a concern, or where the installation standard allows a higher threshold (e.g., some AS/NZS 3000 applications).