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維護電工最常見的故障就是熔斷器的燒毀，通過看熔絲的損壞情況，就可判斷故障類型。
如果熔絲為熔斷體的一端熔斷，為熔斷器氧化、接觸虛或相鄰電路有接觸虛的現象；
如果熔絲為熔斷體的中部熔斷，為過負荷或熔絲（熔斷體）選擇不合適；
如果熔絲為粉碎性熔毀，則為所保護電路短路所致。
