NEN 1010 §434.5

Breaking capacity

Breekvermogen (Icn / Icu)

Also known as: icn, icu, breekvermogen, breaking-capacity, ka

Maximum short-circuit current an automatic circuit breaker can safely interrupt without damage. Icn = nominal standard for dwellings (6000 A), Icu = ultimate industrial value (10/15/25 kA). Insufficient breaking capacity → breaker explodes during actual short circuit.

See also