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分支回路选1P+N（占用两个模数，火线过流+漏电保护），总进线单相用2P（同时断火零线），三相四线选4P；1P+N比2P更省空间但保护逻辑等效

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Unverified单相回路应选1P+N（占2个模数带过零线断开）或2P；纯1P漏保只断火线不断零线，检修时零线仍带危险；三相回路用4P（3火+1零）87% similar Unverified1P+N（占1.5-2模数）适合分支回路且节省配电箱空间，2P（占2模数）能同时断开火线零线、更安全且可承受更高短路电流，进线总开关和大功率回路建议用2P85% similar Unverified1P+N省空间但只断火线（部分产品N线不断开），2P双断更安全却占用更多模数；配电箱空间紧张时选1P+N，追求安全和检修方便选2P84% similar Unverified单相回路选1P+N（带过载短路+漏电+断零线），比单纯2P更安全；三相设备选4P；1P+N比1P占位窄，是现代家装主流77% similar Unverified单相回路（220V）选1P+N或2P，其中1P+N只断相线不断零线、2P同时断开相线和零线；建议选2P，因为总零线接触不良时1P+N保护会失效77% similar

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