Breaking capacity is where this part earns its keep: 121 kA at 240 V AC, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V.
The breaker carries a full 20 A from 40 °C through 55 °C ambient. At 60 °C it derates to 19 A, and stays at 19 A through 70 °C. That's a tight thermal curve — you don't lose much capacity in a warm panel. If your enclosure hits 70 °C, you're still getting 19 A continuous, not a derate to 16 A like some older designs. The maximum power loss is 12 W, which is reasonable for a 20 A frame.
Dimensions are 70 mm deep, 76.2 mm wide, 130 mm tall — a 3-inch wide footprint that fits standard panel-mount cutouts.