It's what you reach for when you need to protect a lighting or general-purpose branch circuit where the inrush isn't brutal and you want the breaker to hold steady under a moderate short.
Above that, derate per the thermal curve — max 95% humidity at 55 °C, dropping to 35% at 75 °C. Breaking capacity is 4.5 kA per EN 60898 and 6 kA per IEC 60947-2. Either way, it's sized for typical sub-distribution — not a main service entrance where you'd see 10 kA or more. Mounting position is any, which simplifies panel layout — no need to keep it upright.
Both top and bottom are combined (screw + clamp), and the terminals are touch-protected per the spec.