It is built for 400 V AC circuits and carries a 4.5 kA breaking capacity per EN 60898, with a 6 kA rating per IEC 60947-2 — the higher figure is the one that governs SCCR coordination in an industrial panel.
The C-curve (tripping characteristic class C) means the breaker holds through 5–10× In for short-duration inrush — typical for motor-starter or transformer primary protection where the magnetizing surge would nuisance-trip a B-curve. The 4 A rating is the continuous thermal current at 400 V AC; for DC circuits the maximum rated voltage drops to 72 V, with a DC breaking capacity of 15 kA per IEC 60947-2, so it handles battery banks or DC bus feeds within that voltage ceiling. For North American panels, the UL 1077 / CSA C22.2 No. 235 listing gives it a 5 kA interrupting rating at 400 V AC — the same breaker, different standard. That 5 kA figure is what the local code inspector checks when the panel label references UL 508A.
The installation depth is 70 mm (76 mm overall depth), so it clears most standard enclosure back-panels. Ambient temperature range is -40 °C to 75 °C, with derating for humidity: max 95% RH up to 55 °C, tapering to 35% RH at 75 °C. Sealable (padlockable toggle) and touch-protected per the product feature.