In order to meet the needs of customers and expand the comprehensive market of overvoltage protection devices, our company introduced the business of varistor. Products include: 5D.7D.10D.14D.20D series. Products have passed various safety certifications (UL.TUV.CCC.CQC). For more details, please contact customer service. . . . . . . . . . . . . . . . . .