Temperature derating and real-world fit
At 30 °C ambient the breaker carries its full 20 A, but at 40 °C it derates to 18.48 A, at 45 °C to 17.6 A, and at 55 °C to 15.92 A.
Physical integration and mounting
Depth is 76 mm (70 mm installation depth), height 90 mm. It's sealable, halogen-free, and silicon-free — no off-gassing worries in clean environments.
It carries the standard EN 60898 and IEC 60947-2 ratings for breaking capacity — that 10 kA figure is the same under both standards, so it meets the common panel-building specs across Europe and much of the world.