Kyawun fashewa wata karamar na'urar fashewa ce da ake amfani da ita don tada manyan fashe-fashe ko tashe-tashen hankula, yawanci wajen hakar ma'adinai, gini, ko ayyukan rushewa. An ƙera shi don haɗa shi da fuse ko lantarki, kuma idan aka kunna shi, yana haifar da ƙaramar fashewa da ke kunna babban cajin fashewar. Ana daidaita magudanar fashewar abubuwa kuma suna buƙatar horo na musamman da lasisi don kulawa da amfani da su cikin aminci.