40 A C-curve MCB, 4-pole, 25 kA — SENTRON 5SY8640-7
It carries a 25 kA breaking capacity per IEC 60947-2 at 400 V AC, with a 15 kA DC rating and 5 kA per UL 1077/CSA 22.2 No.235 — so it handles both IEC and North American fault-current requirements on the same device. At 40 A it covers sub-distribution, lighting panels, and general branch circuits in industrial and commercial panels.
Breaking capacity — IEC, UL, and DC
Three breaking-capacity ratings cover the common installation regimes: 25 kA at 400 V AC per IEC 60947-2 (the main specification for industrial MCBs in Europe and Asia), 15 kA at 72 V DC for DC-side protection, and 5 kA per UL 1077 / CSA 22.2 No.235 for North American supplementary protection. That 25 kA IEC figure means it can be used at the service entrance of most industrial sub-distribution boards without an upstream current-limiting fuse.
Snap-on fastening with any mounting position. Combined top and bottom terminals simplify daisy-chaining busbars. Sealable and touch-protected per the product feature. Halogen-free and silicon-free construction suits clean-room or sensitive-environment panels. Neutral conductor switching is integrated (3P+N), so the neutral pole opens and closes with the phases — no separate neutral disconnect required. Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz.