It protects a 1P+N circuit (one protected pole, one switched neutral) with a C-curve tripping characteristic, rated 25 A at 30 °C ambient.
The 25 A rating at 30 °C is the headline number, but the derating curve is what a panel builder needs: at 40 °C it's 23.5 A, at 50 °C it's 21.75 A, and at 70 °C it drops to 18.25 A. If your enclosure runs hot, size the branch circuit accordingly. The C-curve means magnetic trip occurs at 5–10× In, typical for motor and lighting loads with moderate inrush. The installation depth is 70 mm, with an overall depth of 77 mm including the front face.
Integration notes
The insulation voltage (Ui) is 264 V, and surge voltage resistance is 4 kV.