Rated current holds at 4 A up to 40 °C ambient; above that it derates to 3.9 A at 45 °C, 3.8 A at 50 °C, 3.7 A at 55 °C, and 3.6 A at 60 °C, which matters if the breaker lives in a warm enclosure or next to other heat sources. Mounting position is any, which helps when the rail is vertical or horizontal.
IP20 with connected conductors, IP40 in the handle area — enough for a dry indoor panel but not washdown. Vibration resistance is 50 m/s² at 25 to 150 Hz and 60 m/s² at 35 Hz (4 seconds), so it holds up on machinery with moderate vibration.