selective kurzschlussstromschutzeinrichtung.

摘要

Selective automatic main circuit-breaker In known selective automatic main circuit-breakers, the disconnection point in the main current path is periodically closed, resulting in higher I2t let-through values given a short-circuit current disconnection in a given short-circuit current range. This problem is remedied, in that, after the first short-circuit pulse has been limited, the re-closing of the main contact point is carried out only given nominal operating conditions, and is time-controlled by a selectivity device (33) located in a shunt current path connected in parallel with the main current path. Preferred application area of the novel selective automatic main circuit-breaker are low-voltage distribution systems, especially building installations. IMAGE