The Schneider Electric A9N19892 is an Acti9 DCP Vigi residual current breaker with overcurrent protection (RCBO) — a 2-pole, 10 A unit with integrated 30 mA earth-leakage protection and a B-curve magnetic trip (3...5 x In). The 10 kA breaking capacity (Icn/Icu at 220...240 V AC, 50 Hz) is rated per EN/IEC 61009-2-1 and EN/IEC 60947-2, which means it can interrupt fault currents up to that level without welding contacts or cascading upstream — sized for residential and light commercial distribution boards where the prospective short-circuit current stays under 10 kA.
The 10 A rated current (In) is the continuous load the RCBO can carry without tripping thermally — sized for a lighting circuit, a general-purpose socket ring, or a small appliance group. The 30 mA earth-leakage sensitivity provides personal protection against direct contact — it will disconnect within 300 ms at 150 mA leakage, per the EN/IEC 61009-2-1 standard. The thermal-magnetic trip technology is the workhorse: a bimetal strip handles overloads (time-delayed), and a solenoid handles short-circuits (instantaneous). The tunnel-type terminals accept 1...35 mm² rigid or 1...25 mm² flexible cable; tighten to 2 N·m, strip 12 mm. The toggle provides ON, OFF, and fault-trip local signalling, so a technician can see at a glance whether the device has tripped on leakage or overcurrent.