The Schneider Electric A9D17840 is an Acti9 IKQE RCBO — a residual current breaker with overcurrent protection, combining earth-leakage and overcurrent trip in one 18 mm wide DIN-rail module.
The 10 kA breaking capacity at 230 V AC means it safely interrupts a fault up to that level; the limitation class 3 keeps let-through energy low enough to protect downstream wiring. The 30 mA earth-leakage sensitivity is the standard threshold for personal protection against indirect contact — catches a fault path through a person before fibrillation risk becomes significant.
Clip-on DIN-rail mount, 18 mm wide — that is two 9 mm pitches. Occupies one outgoing position in an Acti9 distribution board.
