NHD a thirty-year old company in Taiwan, is a leading manufacturer of magnetic switches. In1995 NHD was awarded Symbol of Excellence by the National Standers Bureau. In 1998 NHD was awarded ISO-9002 international certificate, and earned ISO-9001: 2000 certificate in 2001. NHD manufacture C-series and S-C series magnetic switches. C-series contactor, BTH-series and NTH-series were all awarded CE certificate by TUV. C-series magnetic switch was also awarded such as UL, CSA and CE certificate. Since 1995, NHD has progressively developed Europe Terminal Block. So far, Rail Mount Terminal Block has developed four different types of Terminal Block including Double Deck Terminal Block. We developed control unit since 2005 and finished to make mold in 2007. The control unit got both UL and TUV approval, accepted by the market continuously as well. NHD kept developing the related products of control units, finished all kinds of cam switch mold in 2008. Meantime, we are the first one who made came switch with keys together, because of this unique cam switch, NHD got CE approval and ISO-9001 in 2009. We are applying UL approval for cam switch now.