The C-curve means the magnetic trip operates between 5 and 10 times the rated current — so 100 to 200 A for a 20 A breaker — which suits general-purpose loads like lighting, socket circuits, and small appliances where inrush is moderate.
This breaker carries two breaking-capacity ratings because it is certified to both the domestic standard (EN/IEC 60898-1) and the industrial standard (EN/IEC 60947-2). Under 60898-1 the Icn is 4500 A at 400 V AC; under 60947-2 the Icu is 6 kA at the same voltage. The limitation class is 3 (per 60898-1), meaning it lets through limited energy during a short-circuit, which helps downstream equipment survive.
Clip-on mounting on a DIN rail, 54 mm wide (6 modules). The neutral is on the left, and the toggle gives ON/OFF plus a trip-indicator flag — useful for a quick visual check during fault-finding. Strip length is 14 mm. The enclosure is IP20 (finger-safe) and IP40 inside a modular enclosure, so it is fine for dry indoor panels but not for washdown environments.