That Z-curve means it trips between 2 and 3 times rated current — tighter than a B-curve — so it's sized for semiconductor or control-circuit protection where you need fast clearing on small overcurrents but want to avoid nuisance trips from inrush.
Rated 2 A at AC, the breaker carries 2.2 A at 30 °C ambient and derates to 1.9 A at 60 °C — that thermal curve matters if the breaker sits in a warm cabinet next to drives or transformers. Breaking capacity is 10 kA per EN 60898 and 15 kA per IEC 60947-2 at 415 V AC; the higher IEC figure gives you headroom on a 400 V industrial supply with a stiff fault current. Maximum operating voltage is 440 V AC for single- or multi-phase, and it's rated up to 72 V DC for those control-circuit applications.
Sealable — that's for padlocking the toggle in the off position during lockout/tagout. Touch protection is built in, so you don't need additional finger guards on the line side. No neutral pole switching — this is a 2-pole breaker for double-pole switching of a single-phase or two-phase load, not a 1P+N configuration.