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多功能電(dian)(dian)力(li)儀(yi)表(biao) 斷路器一(yi)般(ban)由(you)觸頭系統(tong)、滅弧系統(tong)、操(cao)(cao)作機(ji)(ji)構(gou)、脫扣器、外殼(ke)等構(gou)成(cheng)。 當短(duan)路時(shi)，大電(dian)(dian)流（一(yi)般(ban)10至12倍）產生的磁(ci)場克服反力(li)彈簧，脫扣器拉動(dong)(dong)(dong)操(cao)(cao)作機(ji)(ji)構(gou)動(dong)(dong)(dong)作，開關瞬時(shi)跳閘。當過載時(shi)，電(dian)(dian)流變大，發熱量(liang)加劇，雙(shuang)金(jin)屬片變形到一(yi)定程(cheng)度推(tui)動(dong)(dong)(dong)機(ji)(ji)構(gou)動(dong)(dong)(dong)作（電(dian)(dian)流越(yue)大，動(dong)(dong)(dong)作時(shi)間越(yue)短(duan)）。 有電(dian)(dian)子(zi)型(xing)的，使(shi)用互感器采集各相電(dian)(dian)流大小，與設定值比較(jiao)，當電(dian)(dian)流異常時(shi)微處理器發出信號，使(shi)電(dian)(dian)子(zi)脫扣器帶動(dong)(dong)(dong)操(cao)(cao)作機(ji)(ji)構(gou)動(dong)(dong)(dong)作。