The Schneider Electric A9Y80325 is an Acti9 Vigi iC40 add-on residual current device (RCD) — a 3-pole unit rated for 25 A continuous current with 30 mA earth-leakage sensitivity, Type A protection, and voltage-independent tripping. Type A means it catches pulsating DC fault currents from electronics and rectified loads, not just pure AC sine-wave faults.
Rated 25 A at 400 V AC (50/60 Hz) — this RCD is sized for a 25 A outgoing circuit, typically feeding a sub-distribution board, a bank of lighting, or a mixed socket-outlet circuit. Type A detection covers smooth DC residual currents up to 6 mA plus pulsating DC — essential where the downstream load includes single-phase rectifiers, switched-mode power supplies, or variable-speed drives. Voltage-independent tripping means the device stores enough energy from the fault itself to open the contacts; it does not need an external control voltage to operate, so it works even if the neutral is lost upstream. The tunnel-type terminals accept 1…16 mm² rigid or 1…10 mm² flexible copper; the tightening torque is 2 N·m on the bottom connections.
Pollution degree 3, rated impulse withstand voltage 4 kV. The insulation voltage is rated 440 V AC. Storage temperature range -40…85 °C; operating ambient -25…60 °C. Maximum operating altitude 2000 m without derating. Relative humidity tolerance 95 % at 55 °C.