當短路時，大電流(一般10至12倍)產生的磁場克服反力彈簧，脫扣器拉動操作機構動作，開關瞬時跳閘。當過載時，電流變大，發(fā)熱量加劇，雙金屬片變形到一定程度推動機構動作(電流越大，動作時間越短)。
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