1.1 Function 

protection of circuits against short-circuit currents,protection of circuits against overload currents,switch,isolation. 

NB1 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 IT systems. 

C curve (5-10In) 

protection for resistive and inductive loads with low inrushcurrent. 

D curve(10-14In) 

protection for circuits which supply loads with high inrush current at the circuit closing (LV/LV transformers, breakdown lamps). 

1.3 Approvals and certificates 

Detailed information, please refer to Certificates Table on the last page.