熔斷器（Fuse）是一種過電流保護(hù)電器，通過熔體熔斷斷開電路來保護(hù)電氣設(shè)備和線路。熔斷器是一種基于電流熱效應(yīng)的短路或過載保護(hù)電器，通過熔體在故障時快速熔斷切斷電流，保護(hù)電路安全?其核心結(jié)構(gòu)包括熔體（低熔點合金絲）、熔管/外殼（滅弧保護(hù)）及觸頭。當(dāng)電路過載或短路時，熔體因電流過大而熔斷，實現(xiàn)分?jǐn)啾Ｗo(hù)?

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熔斷器（fuse）是指當(dāng)電流超過規(guī)定值時，以本身產(chǎn)生的熱量使熔體熔斷，斷開電路的一種電器。熔斷器是根據(jù)電流超過規(guī)定值一段時間后，以其自身產(chǎn)生的熱量使熔體熔化，從而使電路斷開；運(yùn)用這種原理制成的一種電流保護(hù)器。熔斷器廣泛應(yīng)用于高低壓配電系統(tǒng)和控制系統(tǒng)以及用電設(shè)備中，作為短路和過電流的保護(hù)器，是應(yīng)用普遍的保護(hù)器件之一。