The Schneider Electric A9N26595 is a Vigi xC60 add-on residual current device (RCD) from the Acti9 range, designed as a 4-pole (4P) block rated at 25 A with 30 mA sensitivity, Type AC earth leakage protection. The electromechanical, voltage-independent trip mechanism means it operates without needing an external power supply — the fault current itself provides the energy to open the circuit, which keeps protection active even if the line voltage drops.
The 30 mA sensitivity covers standard personnel protection against direct contact (hand-to-hand or hand-to-ground fault paths). The 25 A current rating matches the upstream MCB; the block is sized to handle the same load without derating. Rated operational voltage of 400...415 V AC at 50/60 Hz aligns with standard three-phase four-wire networks (-L2-L3-N) common in European and IEC-based installations. The instantaneous trip time (no intentional delay) means it clears ground faults within the RCD's natural operating window — typically under 40 ms at rated sensitivity — which is the expected behavior for personnel protection. The impulse withstand rating of 250 A (8/20 µs surge) indicates the device can survive transient surge currents from nearby lightning or switching events without nuisance tripping or damage, though it is not a surge-protective device itself.
The 4P block occupies 6 x 9 mm pitches (54 mm total width on the rail), so it fits modular enclosures with a 54 mm-wide slot. Height is 87 mm, depth 74.5 mm — verify clearance against the enclosure door or gland plate. The red indicator on the front face shows the trip status visually — useful for fault isolation during commissioning or troubleshooting.