The A9Z02240 is a 2-pole (2P) residual current circuit breaker (RCCB) from the Acti9 ID K series, rated 40 A at 220-240 V AC, 50/60 Hz. The 30 mA earth-leakage sensitivity covers personnel protection (hand-to-hand or hand-to-ground faults) per EN/IEC 61008-1. Type A detection handles sinusoidal AC and pulsating DC residual currents — the standard choice for circuits with single-phase rectified loads like switched-mode power supplies or electronic ballasts. Voltage-independent tripping means the RCCB disconnects even if the line voltage collapses — no auxiliary supply needed. Instantaneous response (no intentional delay) suits it for outgoer circuits where nuisance tripping from transient surges is not a concern; the 8/20 µs impulse withstand of 200 A gives some margin against lightning-induced spikes. Rated breaking and making capacity is 500 A (Idm and Im), adequate for most final-distribution faults.
Deployment context
The 1...35 mm² range covers most final subfeed conductors up to 40 A.