It protects a 1P+N circuit at 20 A rated current (at 50 °C) with a 10 kA breaking capacity at 240 V AC, and integrates 30 mA earth-leakage protection. The curve C trip characteristic handles moderate inrush from motor or lighting loads without nuisance tripping.
The 10 kA Icn at 240 V AC (per IEC 61009-1) is the short-circuit breaking capacity this RCBO can safely interrupt. For a final sub-distribution board fed by a transformer with a prospective fault current under 10 kA, this unit clears faults without needing an upstream current-limiting device. The 30 mA earth-leakage sensitivity is the standard threshold for personal protection against indirect contact in TN earthing systems — it trips within 300 ms at 150 mA residual current, meeting IEC 61009-2-2 requirements. The thermal-magnetic trip unit gives two protection curves: the thermal element handles overloads (sustained overcurrents), while the magnetic element reacts to short-circuits. Curve C means the magnetic trip activates at 5 to 10 times In (100 to 200 A for this 20 A unit), which suits general-purpose circuits feeding socket outlets, lighting, and small motor loads.
Neutral on the left, outgoing on the bottom. The IP20 body is suitable for enclosed distribution boards; IP40 with modular enclosure.