The IP20 rating applies with conductors connected, so it's intended for enclosed distribution boards or consumer units — not for exposed outdoor mounting.
Breaking capacity is 4.5 kA per EN 60898 and 5 kA per IEC 60947-2. For a 2 A C-curve MCB feeding a lighting or small-appliance final subcircuit in a residential or light-commercial board, that's adequate headroom against a typical 6 kA prospective fault current at the service entrance — but verify coordination with the upstream device if the supply transformer is close-coupled.
Rated current holds at 2 A up to 30 °C ambient. At 40 °C it derates to 1.9 A, at 45 °C to 1.86 A, and at 55 °C to 1.75 A.