熔斷器是一種基于電流熱效應的短路或過載保護電器，通過熔體在故障時快速熔斷切斷電流，保護電路安全?。其核心結構包括熔體（低熔點合金絲）、熔管/外殼（滅弧保護）及觸頭。當電路過載或短路時，熔體因電流過大而熔斷，實現分斷保護?

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

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保護功能

短路保護：在短路電流作用下，熔斷器幾乎立即熔斷（毫秒級響應），切斷故障電路 。 ?

過載保護：對持續(xù)過載電流（如1.25倍額定電流以上）有延遲熔斷特性，但保護效果不如專用熱繼電器