It carries a 13 A rated current at 50/60 Hz AC with a B tripping curve — meaning it trips between 3 and 5 times rated current, which is the standard choice for resistive and general-purpose loads like lighting circuits, control transformers, and small motor starters in industrial panels.
Sizing and derating for panel temperature
At 35 °C ambient the breaker carries the full 13 A. Derate to 12.48 A at 40 °C, 12.22 A at 45 °C, 11.95 A at 50 °C, 11.67 A at 55 °C, and 11.39 A at 60 °C. For a panel that runs warm — say 50 °C inside the enclosure — you're effectively working with a 12 A device, so size upstream protection accordingly.
Mounting position is any orientation.