The B characteristic (3-5x In) means it trips fast on short circuits but holds through brief inrush from resistive loads like lighting or heating elements.
That's sufficient for most residential and commercial sub-distribution boards fed by a transformer of typical impedance. The 1-pole design (single-phase protection) and 18 mm width mean it occupies one modular unit on the DIN rail — critical when you're packing 12 or 18 ways into a 4-row enclosure and every millimeter counts. The -40 °C to 75 °C operating range covers unheated utility rooms and roof spaces in most climates.