Current derating is published across the full ambient range: 20 A at 30 °C drops to 19.5 A at 40 °C, 19.2 A at 45 °C, 18.9 A at 50 °C, 18.7 A at 55 °C, 18.4 A at 60 °C, and 17.8 A at 70 °C. If the panel runs hot — say 50 °C inside — the usable continuous current is 18.9 A, not the 20 A label. The C-curve trips magnetically between 5× and 10× In, so motor-start or capacitor-switching inrush won't nuisance-trip on a properly sized circuit. Rated insulation voltage (Ui) is 500 V, surge voltage resistance 4 kV, overvoltage category III — standard for fixed-installation distribution boards.
Depth is 72 mm, height 85 mm, installation depth 70 mm.
For a BOM freeze or line-down replacement, this part is a direct drop-in for any panel designed around a 4-pole C-20 A SENTRON RCBO in a 4 MW footprint.