The 8 A rating holds at 30 °C ambient; at 40 °C it derates to 7.52 A, and at 50 °C it drops to 7 A. The 1P+N configuration switches the phase and disconnects the neutral; the neutral pole is not overcurrent-protected, so this is for single-phase circuits where neutral switching is required for isolation. The installation depth behind the panel is 70 mm, so it fits most domestic enclosures without the cover fouling the busbar. Touch protection is built in — no exposed live metal when the toggle is in the off position.
Where it goes and what it handles
Siemens lists this for residential buildings and infrastructure — think final sub-circuits in apartment distribution boards, lighting and general-purpose socket outlets in commercial fit-outs, or small HVAC branch protection. The IP20 rating (with conductors connected) means it's for dry indoor enclosures only; no washdown or outdoor exposure without a secondary enclosure. It's sealable — a lead-seal wire can be passed through the toggle housing to lock the breaker in the off position for lockout/tagout.