Breaking capacity — the real-world interrupt rating
At 400 V this breaker interrupts 50 kA; at 500 V it holds 8 kA; at 690 V it still clears 4 kA. At 240 V it handles 100 kA. Those are the numbers that determine whether this part survives a bolted fault on your line without welding its contacts shut or cascading upstream. For a 40 A motor circuit on a 400 V distribution panel, 50 kA SCCR is generous — it covers most industrial service entrances.
Width 55 mm, depth 149 mm, height 140 mm. Side clearance: 10 mm. Upward and downward clearance: 50 mm each. Main terminals accept 2x 1–35 mm² or 1x 1–50 mm² solid/stranded, terminated with M6 screws.
Protection logic and operating limits
No ground fault detection on this variant. Rated operational voltage span 20–690 V. Maximum switching frequency in AC-3 duty is 15 operations per hour.