当供电线路中出现过载、短路或漏电时能自动切断电路。本开关自身带有漏电保护功能（I型除外），作总开关时具有三相对称漏电保护用于分支开关漏电的后备保护，作分支开关使用时还具有选择性漏电保护与漏电闭锁功能，过载保护具有反时限特性，近端出口短路采用大电流无压释放电路保护。
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