What this MCB brings to the panel
Rated 400 V AC, it covers standard European 230/400 V distribution panels. Also carries a 5 kA rating under UL 1077 / CSA C22.2 No.235 for North American supplementary protection applications.
D-curve selectivity and load fit
The D characteristic (10–20× In magnetic trip) is the key differentiator from a B-curve (3–5× In) or C-curve (5–10× In) MCB. For a 20 A circuit feeding a 7.5 kW motor direct-on-line, the starting current can hit 140–160 A for 50–100 ms — a C-curve might hold, but the D-curve gives you a solid margin against random trips on a warm re-start.
Mounting and wiring — DIN rail fit
Occupies 1 width unit (18 mm), so a 12-way distribution board holds 12 of these. IP20 with conductors connected; keep it inside a closed panel.