The 77 mm depth plus 70 mm installation depth means it sits flush in a typical distribution board without protruding past the gland plate. Mounting position is any, so no restriction on board orientation.
Thermal derating — what the numbers mean
At 40 °C it's 37.6 A; at 50 °C, 34.8 A; at 60 °C, 32.4 A; at 70 °C, 29.2 A. That's a roughly 27 % derating from 30 °C to 70 °C. If this RCBO sits in a crowded board next to other heat sources, the effective current capacity drops — plan the load accordingly.
Rated per EN 60898 for the 10 kA breaking capacity. Overvoltage category III, energy limiting class 3. The design code is 5SU1; the function letter per DIN EN 61346-2 and DIN EN 81346-2 is F (protective device). Type of fault current is AC (sine-wave residual current detection).