The Schneider Electric A9N19304 is an Acti9 DPN Vigi residual current circuit breaker with overcurrent protection (RCBO) in a 1P+N format — it combines a thermal-magnetic MCB and a voltage-independent earth leakage module in one 4-module wide (9 mm per pitch) DIN-rail unit. The 10 A rated current (In) at 30 °C and C-curve magnetic trip (5 to 10 x In) mean it's sized for general-purpose socket circuits and small lighting loads where moderate inrush from capacitive or motor-start loads is expected. The 10 mA earth leakage sensitivity (Type A) detects sinusoidal AC and pulsating DC residual currents, which covers most modern electronics and variable-speed drive leakage profiles.
The toggle provides local ON/OFF indication and a contact position indicator. Pollution degree 3 and tropicalisation class 2 per EN 61009 mean it's rated for environments with conductive pollution and high humidity (95 % at 55 °C) — suitable for installation in non-conditioned enclosures. Operating altitude is rated to 2000 m without derating.
The voltage-independent residual current tripping technology means the earth leakage protection operates even if the line voltage is lost — a key safety feature for fault detection on a dead circuit. Electrical and mechanical durability are both rated at 20,000 cycles per IEC 61009.