The term overvoltage is a condition in which voltage is higher than the level that the object is rated for. It occurs every day, everywhere in our daily life when there are lightning strikes, sudden change of voltage from the power lines or even switches on or off a device connecting with the power grid. As a result, these overvoltage surges could be harmful to those electric-powered equipments such as computer, fax machine, TV, surveillance system and other appliances through power lines, telecom networks or other ways. To protect those equipments from unrecoverable damages, we provide wide range of different over voltage protection devices to help customers manufacture more reliable products.