It is a 3-pole unit rated 25 A with 300 mA sensitivity, Type AC (sinusoidal AC fault currents only).
The 25 A rated current (In) and 300 mA earth-leakage sensitivity define the protection envelope: the block sits downstream of a 25 A iC60 MCB and trips on residual currents above 300 mA. Type AC detection covers sinusoidal AC faults only — not pulsed DC or smooth DC, which is the limitation to watch if your load includes VFDs, UPS systems, or LED drivers that can generate non-sinusoidal leakage. Rated operational voltage is 400 V AC (400/415 V AC per IEC 61009-1), insulation voltage 500 V AC, and impulse withstand 6 kV — all consistent with standard 3-phase distribution in a 400 V TN or IT system. The voltage-independent tripping technology means the RCD operates without needing a separate power supply; it draws its trip energy from the fault current itself. IP20 on the body (finger-safe), IP40 inside a modular enclosure.
Clip-on mounting to DIN rail, with screw connection to the upstream MCB. Tightening torque 2 N·m, strip length 14 mm. The 74 mm depth keeps the assembly within standard distribution board clearances. Instantaneous trip (no time delay) and 8/20 µs impulse withstand of 250 A per IEC 61009-1. The trip indicator gives local visual confirmation of which device has operated — useful during fault-finding on a multi-circuit panel.