It's built for outgoing circuits in final distribution boards where you need to add earth-leakage protection without swapping the whole breaker. Rated at 25 A with 30 mA sensitivity and Type A earth-leakage protection, it catches sinusoidal AC faults and pulsating DC fault currents — the kind you get from rectifiers, VFDs, or switched-mode supplies. The instantaneous trip means no time delay; it clears a ground fault as fast as the fault current rises. The voltage-independent trip mechanism means the RCD doesn't need a separate power supply or the line voltage to operate. If neutral is lost or the supply drops, the device still trips on a residual current — a real safety advantage in degraded conditions.
Where it lives in the panel
Clip-on mounting onto a DIN rail, 1P+N format — it occupies two 9 mm pitches (18 mm total width). It screws directly to the adjacent MCB for the electrical connection. Rated IP20 on the device body, IP40 inside a modular enclosure — standard for dry indoor distribution boards.