At 220/240 V it handles 90 kA; at 480 V (UL rating) it still holds 50 kA. For a 400 V distribution board, 50 kA Icu gives solid headroom against most utility-fault scenarios. The utilisation category is A, meaning it is not intended for cascading (no intentional short-time delay for selectivity with downstream breakers — that is Category B territory).
The 105 mm width and 161 mm height fit standard ComPacT NSX cutouts; depth is 86 mm. Connection pitch is 35 mm, and both upside and downside connections are front-accessible, so busbar or cable routing stays clean.
Electrical and mechanical endurance
Rated for 50,000 mechanical cycles and up to 30,000 electrical cycles at rated current (440 V In). At half load (In/2) that climbs to 50,000 electrical cycles. That is a solid service life for a distribution breaker — not a daily-switching contactor, but fine for occasional load isolation and fault clearing over years of panel life.