The Schneider Electric A9N16205 is an Acti9 xID residual current circuit breaker (RCCB) — a 2-pole, Type AC device rated at 40 A with 100 mA earth-leakage sensitivity. The Type AC classification means it detects sinusoidal AC earth faults only, so it's suited for general-purpose circuits where no pulsed DC or mixed-frequency leakage is expected — think lighting, socket outlets, and resistive loads in commercial or residential distribution boards.
The 40 A rated current (In) sets the continuous load this RCCB can carry without tripping on overload — sized for a 40 A submain or final circuit. The 100 mA sensitivity is less sensitive than the common 30 mA type; it's chosen where nuisance tripping from cable capacitance or equipment leakage is a concern, or where the installation standard allows a higher threshold (e.g., fire-protection RCCBs or circuits feeding fixed equipment).
Integration notes
Neutral is on the left — verify busbar orientation if linking to an adjacent MCB or RCCB. Tunnel terminals accept 1-35 mm² rigid or 1-25 mm² flexible; strip 14 mm, torque to 3.5 N·m. Padlocking provision allows lockout for isolation, and the toggle gives clear ON/OFF/trip indication.