1-pole 40 A B-curve MCB for panel and railway duty
It occupies a single 18 mm modular width on the DIN rail and is rated for a breaking capacity of 10 kA per EN 60898 and 15 kA per IEC 60947-2, giving it headroom for high-fault utility connections or industrial sub-distribution. The part is designated for railway applications, with halogen-free and silicon-free construction, and carries IP20 protection with connected conductors.
The 40 A rating at 35 °C is the nominal; derate to 37.56 A at 40 °C, 36.28 A at 45 °C, 34.96 A at 50 °C, 33.6 A at 55 °C, and 32.16 A at 60 °C. In a warm panel — say 50 °C ambient — expect the breaker to carry 34.96 A continuously without tripping. The 10 kA (EN 60898) and 15 kA (IEC 60947-2) ratings mean it can safely interrupt faults at those levels; the IEC 60947-2 figure is the one to use for industrial panel SCCR calculations.