nc 100h high breaking capacity circuit breaker is used for ac 50hz or 60hz,single pole 240v,2,3,4 poles 415v,for protecting the circuit which overload and short circuit may take place.it can be used i lighting and electric motor distribution system.meantime it is applicable to an unfrequent switch the electric apparatus and lighting circuit under normal condition.breaking capacity is up to standard of iec947-7 10ka.