It protects a single-phase final subcircuit against earth leakage and overload/short-circuit in one device, saving a DIN-rail position compared to separate RCCB and MCB. Rated 20 A at 30 °C ambient with a Type C tripping characteristic (magnetic release at 5–10× In), it handles moderate inrush from motorized loads like small pumps or compressors.
Derating and installation constraints
The 20 A rating derates with rising ambient temperature: 18.8 A at 40 °C, 17.4 A at 50 °C, 15.4 A at 65 °C, and 14.6 A at 70 °C. In a warm enclosure, size the upstream protection and load accordingly — the 70 °C figure is the practical limit for a crowded panel.
The energy limitation class is 3, meaning it limits let-through energy under fault conditions.