tˈuː tˈaɪps ʌv ˌoʊvɚvˈoʊltɪdʒ pɹətˈɛkʃən dɪvˈaɪsᵻz ɑːɹ kˈɜːɹəntli jˈuːzd: klˈæmpɪŋ, wˌɪtʃ pˈæsᵻz θɹuː vˈoʊltɪdʒᵻz ˌʌp tʊ ɐ sˈɜːʔn̩ lˈɛvəl, ænd fˈoʊldbæk, wˌɪtʃ ʃˈʌnts vˈoʊltɪdʒ ɐwˈeɪ fɹʌmðə lˈoʊd.
Two types of overvoltage protection devices are currently used: clamping, which passes through voltages up to a certain level, and foldback, which shunts voltage away from the load.