Three-pole (3P) construction, rated operational voltage 230/415 V AC at 50/60 Hz per EN/IEC 61009-1.
The 25 A rated current (In) matches the upstream iC60 MCB rating — the add-on block does not change the circuit's overcurrent protection; it adds residual current detection downstream. The 300 mA sensitivity is the standard for fire protection in distribution sub-mains (not personal shock protection, which typically calls for 30 mA). Type A detection handles sinusoidal AC faults plus pulsating DC up to 6 mA smooth DC — covers most modern electronic loads (VFDs, switched-mode supplies) that can mask a pure AC RCD. Voltage-independent tripping means the RCD clears a fault even if the phase voltage collapses — no auxiliary supply needed.
Clip-on mounting to DIN rail, 6 x 9 mm pitch modules wide (108 mm). Tunnel-type terminals accept 1–25 mm² rigid or 1–16 mm² flexible cable; tightening torque 2 N·m. The add-on block screws directly to the iC60 MCB's outgoing side — no extra wiring between devices. IP20 finger-safe (IP40 in modular enclosure). Pollution degree 3 per IEC 60947-2, meaning it's rated for conductive environments typical of industrial panel interiors.