1.1 Function
Protection of circuits against short-circuit currents,
Protection of circuits against overload currents,
Switch, isolation.
NB1-63H circuit-breakers are used in domestic installation,
As well as in commercial and industry electrical
Distribution systems.
1.2 Selection
Technical data of the network at the point considered
short-circuit current at the circuit-breaker installation point,
Which must always be less than the breaking capacity of
this device network normal voltage
Tripping curves
B curve (3-5In)
Protection for people and big length cables in TN and TI
Systems.
C curve (5-10In)
Protection for resistive and inductive loads with low inrush
Current
D curve (10-14In)
Protection for circuits which supply loads with high inrush
Current at the circuit closing
(LV/LV transformers, breakdown lamps)