Allolin tungsten na azurfa sun ƙunshi tsakanin 15-70% azurfa.Ana amfani da su musamman don lambobin sadarwa na lantarki-gabaɗaya na'urori masu nauyi waɗanda ke ƙarƙashin babban halin yanzu,
kamar motsi lamba don masu watsewar kewayawa tsakanin 100 da 800 A, masu fashewar ƙasa, lamba mai motsi don mai watsewar iska tsakanin 1000 da 10000 A, ma'aunin zafi da sanyio, ƙananan masu jujjuyawar kewayawa, lamba arcing don manyan lambobin sadarwa masu girma, gyare-gyaren yanayin da'ira da nauyi mai nauyi. -load AC / DC contactors, da dai sauransu.