It's a Type B (instantaneous) device — the magnetic trip operates without intentional delay, so it clears high-impedance faults fast, but selectivity with downstream MCBs needs careful coordination. Rated 20 A at 30 °C ambient on a 400 V AC 50 Hz system, it carries a 6 kA breaking capacity certified to both EN 60898 and IEC 60947-2.
Temperature derating — the real current rating on your panel
Inside a warm enclosure — say 50 °C — the continuous current drops to 18.9 A. At 60 °C it's 18.4 A, and at 70 °C it's 17.8 A. If your panel runs hot, size the upstream protection and load accordingly; the derating curve is linear enough to interpolate between the given points.
Depth is 72 mm, installation depth 70 mm — check your enclosure depth if you're retrofitting into a shallow board. IP20 only when the distribution board is installed with conductors connected — not a standalone IP rating. The test button needs at least 195 V to operate.