Ningbo Qualitek Instrument Co.,Ltd. is one of the most professional manufacturers and exporters in China. The company has more than ten years experience in electrical installations,Such as Miniature circuit breakers,Residual current circuit breakers,Earth leakage circuit breakers,Contactors, Relays etc. The company has passed ISO9001 certificate,and the products have got CE, CB,NF,SEMKO and RoHS approvals. Our products are exported to all over the world,but Europe,South America, South-east Asia is most.