The D-curve means the magnetic trip fires between 100 A and 200 A (10–20× In), so it won't nuisance-trip on the inrush of a 10 A-rated transformer or a bank of contactor coils. The IP20 rating applies only with connected conductors — the terminals themselves are finger-safe once wired.
At 2 MW (36 mm wide), it occupies two 18 mm modular spaces. Halogen-free and silicon-free construction — important for rail and aerospace applications where outgassing can contaminate sensitive contacts or optics.