The Schneider Electric A9D18820 is an Acti9 IKQE RCBO — a combined residual current circuit breaker with overcurrent protection in a single 1P+N module. It occupies 2 x 9 mm pitches on a DIN rail, rated at 20 A with a C-curve trip characteristic and 100 mA earth-leakage sensitivity. The 10 kA Icn breaking capacity at 230 V AC (50/60 Hz) covers most domestic and light commercial distribution boards, and the thermal-magnetic trip unit handles both overload and short-circuit protection in one device.
Clip-on mounting to DIN rail (EN 60715) with the neutral on the left. The tunnel-type terminals accept 1–16 mm² rigid cable or 1–10 mm² flexible (with or without ferrules); strip 13 mm and torque to 2 N·m. The toggle gives local ON/OFF indication and the device is padlockable (Ø 4 mm padlock) for lockout/tagout.