It provides LI protection — thermal overload (L) via a fixed long-time delay and adjustable magnetic short-circuit (I) pickup from 5 to 10 x In. The 3-pole 3D configuration suits three-phase distribution panels where earth-leakage protection is handled separately or not required.
Rated operational voltage is 690 V AC 50/60 Hz and 750 V DC, so the trip unit handles standard 400/480 VAC distribution as well as DC bus circuits up to 750 V. The long-time protection delay is fixed at 120 to 400 s at 1.5 x In, with a faster 15 s trip at 6 x Ir — that thermal curve is preset and not field-adjustable, so verify coordination with downstream breakers. The instantaneous pickup (Ii) is adjustable from 5 to 10 x In, giving you a 1250 to 2500 A magnetic trip window to avoid nuisance trips on motor inrush while still clearing hard faults.
Integration notes
This is a trip unit, not a complete breaker — it installs into the ComPacT NSX100...250 fixed-mount frame. IP40 front-face protection keeps tools and fingers out but is not washdown-rated; keep the panel sealed if installed in wet areas.