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低壓斷路器用作交、直流線路的過載、短路保護(hù)，被廣泛應(yīng)用于建筑照明、動力配電線路、用電設(shè)備作為控制開關(guān)和保護(hù)設(shè)備，也可用于不頻繁起動電動機(jī)以及操作或轉(zhuǎn)換電路
1．種類
（1）式斷路器
（2）塑料外殼式斷路器
（3）電動斥力式限流斷路器
（4）剩余電流保護(hù)斷路器
（5）直流快速斷路器
（6）滅磁斷路器
2．低壓斷路器的選用要點(diǎn)
表示低壓斷路器性能的主要指標(biāo)有分?jǐn)嗄芰捅Ｗo(hù)特性。
分?jǐn)嗄芰κ侵搁_關(guān)在指定的使用和工作條件及在規(guī)定的電壓下接通和分?jǐn)嗟拇箅娏髦担╧A）。
保護(hù)特性主要分為過電流保護(hù)、過載保護(hù)和欠電壓保護(hù)三種。
（1）額定電壓
斷路器的額定電壓應(yīng)大于線路額定電壓。主要是交流380V或直流220V的供電系統(tǒng)。按線路額定電壓進(jìn)行選擇時應(yīng)滿足下列條件：
（4-10-5）
式中 ——低壓斷路器的額定電壓，V；
——線路的額定電壓，V。

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