It's a 40 A, B-curve, 1P+N unit with a thermal-magnetic trip mechanism, meaning it protects against both overloads and short circuits in a single module. The B-curve trips magnetically between 3.2 and 4.8 times the rated current (4 x In +/- 20%), making it the right choice for resistive or general-purpose loads where inrush current is low — think lighting circuits, small heaters, or control transformers. It's not the curve for motor starting or transformer primaries; that'd be a C or D curve. Breaking capacity is where this unit earns its keep: 36 kA Icu at 12–60 V AC, 20 kA at 100–133 V, and 10 kA at 220–240 V per EN/IEC 60947-2, plus 6000 A Icn at 230 V per EN/IEC 60898-1. That 36 kA figure at low voltage is substantial — it handles high-fault-current scenarios common in industrial control panels fed by large transformers.
The 1P+N configuration has the neutral on the left, switched but not protected — only the phase pole is protected. That's typical for single-phase distribution where the neutral is bonded to ground upstream. IP20 rated, so it's for enclosure use, not exposed washdown areas.
Compliance is straightforward: it meets both EN/IEC 60898-1 (household-style MCB standard) and EN/IEC 60947-2 (industrial circuit-breaker standard), so it's accepted in residential, commercial, and light industrial panels. Pollution degree 3, overvoltage category IV, suitability for isolation confirmed per both standards.