It protects a single-phase final subcircuit against both overload/short-circuit (Type C characteristic, 10 A rated at 30 °C) and earth leakage (30 mA, AC type).
The 10 A rating at 30 °C is the headline figure, but the real-world current-carrying capacity drops as the enclosure temperature rises: 9.4 A at 40 °C, 8.8 A at 45 °C, 8.4 A at 50 °C, 8.1 A at 60 °C, and 7.4 A at 70 °C. The Type C characteristic (5–10× In magnetic trip) suits loads with moderate inrush, such as small motor starters, fluorescent lighting banks, or transformer-coupled equipment.
