The 2-pole construction switches both line and neutral on a 230 V AC supply.
The 0.5 kA rating under EN 60898 is the conditional short-circuit capacity with an upstream backup fuse; in practice, the 10 kA figure governs the withstand. The I²t let-through is capped at 70 000 A²·s, which helps with downstream coordination. The 30 mA trip threshold is the IEC touch-protection limit for direct contact. Type A detection catches the pulsed DC waveforms common in modern drives and power supplies — if your panel feeds VFDs or battery chargers, a plain AC-type RCCB may nuisance-trip or fail to trip; this one won't. The 40 A rating holds up to 40 A at 45 °C ambient, then derates linearly to 32 A at 70 °C. If the panel runs hot — say, a packed enclosure near a furnace or in a tropical climate — the 38.4 A at 50 °C and 36.8 A at 55 °C figures let you calculate the real headroom without guessing.
At 36 mm wide (2 modular width units), it fits a standard 18 mm-per-module grid. Depth is 70 mm — check the gland plate clearance if the enclosure is shallow.