It's halogen-free and silicon-free, which keeps the plastic from off-gassing into sensitive contacts. The IP20 rating (with conductors connected) is typical for a panel device — it's not a waterproof switch, but it holds up in a clean, closed cabinet.
The depth is 76 mm. Up to 95% humidity at 55 °C, dropping to 35% at 75 °C — no condensation worries inside a warmed-up panel. Sealable with a lockout tagout attachment. Combined terminals on top and bottom accept a range of conductors. Neutral conductor is not switched, so this breaker handles typical 4-wire systems where the neutral is continuous.