Protection of circuits against short-circuit currents,
Protection of circuits against overload currents,
Technical data of the network at the point considered:
The earthing systems (TNS, TNC),
Short-circuit current at the circuit-breaker installation point,
which must always be less than the breaking capacity of
this device, network normal voltage.
B curve (3-5In)
Protection for people and big length cables in TN and IT systems.
C curve (5-10In)
Protection for resistive and inductive loads with low inrush current.
Protection for circuits which supply loads with high inrush
current at the circuit closing
(LV/LV transformers, breakdown lamps).