What the D-curve and 6 A rating mean for your panel
At 6 A, it protects downstream wiring and loads on a 1P+N (switched neutral) circuit, occupying 2 modular units (36 mm) on the DIN rail. Breaking capacity is 6 kA per EN 60898, and 5 kA per UL 1077 / CSA C22.2 No. 235 — sufficient for most commercial and light industrial distribution boards where the prospective fault current stays under those thresholds.
The 6 A rating holds at 35 °C. At 40 °C it derates to 5.51 A, at 45 °C to 5.25 A, at 50 °C to 4.97 A, and at 55 °C to 4.69 A. If your panel runs hot — near a drive or transformer — apply the derating curve to avoid nuisance tripping at rated load. The breaker survives ambient from -40 °C to 75 °C, with humidity limits of 95% up to 55 °C, tapering to 35% at 75 °C.
Combined terminals top and bottom simplify daisy-chaining busbars. The neutral conductor is switched internally (1P+N design), so no separate neutral pole is needed — saves a module width compared to a 2-pole breaker with unswitched neutral.