The Schneider Electric A9CR5240 is a 2-pole residual current circuit breaker (RCCB) from the Acti9 REDs series, rated at 40 A with a 300 mA earth leakage sensitivity (Type A). It operates on a 230 V AC, 50 Hz phase-to-neutral network and is designed for TT and TN-S earthing systems. The recloser function automatically restarts after a transient insulation fault — up to three consecutive restarts with a 180 s minimum interval between closings — and stops the cycle if a persistent fault is detected, then retries diagnosis every 2 minutes.
The 40 A rated current and 300 mA earth leakage sensitivity define the load and protection threshold — sized for outgoing circuits where nuisance tripping from leakage is a concern. The reclosing logic — 10 s reclosing time, maximum 30 operations/hour, max 3 consecutive restarts — is built for transient fault environments (e.g., outdoor lighting, irrigation) where temporary insulation breakdown clears itself. The 500 V rated insulation voltage gives headroom above the 230 V operating level. Mounts on a 35 mm symmetrical DIN rail, occupies 6 x 9 mm pitches — 54 mm wide — and needs 82 mm depth behind the panel.
Designed to EN 50557, the standard for automatic reclosing devices for RCCBs. IP20 degree of protection — suitable for dry indoor panel environments.