1.1 Function 

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

NB1-63G 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 consideredshort-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 inrus current.