{"id":4977,"date":"2026-11-12T09:56:28","date_gmt":"2026-11-12T01:56:28","guid":{"rendered":"https:\/\/cnkuangya.com\/?p=4977"},"modified":"2026-11-12T09:56:31","modified_gmt":"2026-11-12T01:56:31","slug":"rcd-trips-mcb-off","status":"publish","type":"post","link":"https:\/\/cnkuangya.com\/ja\/blog\/rcd-trips-mcb-off\/","title":{"rendered":"MCB\u304c\u30aa\u30d5\u306e\u6642\u306bRCD\u304c\u30c8\u30ea\u30c3\u30d7\u3059\u308b\u306e\u306f\u306a\u305c\u304b\uff1f\u4e2d\u6027\u7dda\u30fb\u5730\u7d61\u6545\u969c\u306e\u8aac\u660e"},"content":{"rendered":"<p><strong>\u30af\u30a4\u30c3\u30af\u30a2\u30f3\u30b5\u30fc\uff1a<\/strong> \u56de\u8def\u30d6\u30ec\u30fc\u30ab\u30fc\uff08MCB\uff09\u304c\u30aa\u30d5\u306e\u72b6\u614b\u3067\u3082\u3001\u4e0a\u6d41\u306e\u6f0f\u96fb\u906e\u65ad\u5668\uff08RCD\uff09\u304c\u30c8\u30ea\u30c3\u30d7\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u5358\u6975MCB\u306f\u3001\u30e9\u30a4\u30f3\u5c0e\u4f53\u306e\u307f\u3092\u5207\u65ad\u3059\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u5834\u5408\u3001\u5206\u5c90\u56de\u8def\u306e\u30cb\u30e5\u30fc\u30c8\u30e9\u30eb\u7dda\u306f\u63a5\u7d9a\u3055\u308c\u305f\u307e\u307e\u306b\u306a\u308a\u307e\u3059\u3002\u610f\u56f3\u3057\u306a\u3044\u30cb\u30e5\u30fc\u30c8\u30e9\u30eb-\u30a2\u30fc\u30b9\u9593\u7d4c\u8def\u3084\u5171\u6709\u30cb\u30e5\u30fc\u30c8\u30e9\u30eb\u7dda\u304c\u5b58\u5728\u3059\u308b\u3068\u3001\u5225\u306e\u56de\u8def\u306b\u96fb\u6d41\u304c\u6d41\u308c\u305f\u969b\u306b\u4e0d\u5e73\u8861\u304c\u751f\u3058\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u8003\u3048\u3089\u308c\u308b\u539f\u56e0\u306e\u4e00\u3064\u3067\u3042\u308a\u3001\u8a3a\u65ad\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u30b5\u30fc\u30d3\u30b9\u3092\u5fa9\u65e7\u3059\u308b\u524d\u306b\u3001\u8cc7\u683c\u306e\u3042\u308b\u96fb\u6c17\u6280\u5e2b\u306b\u5b9f\u969b\u306e\u6545\u969c\u3092\u7279\u5b9a\u3055\u305b\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h2>2\u3064\u306e\u30c7\u30d0\u30a4\u30b9\u304c\u5b9f\u969b\u306b\u76e3\u8996\u3057\u3066\u3044\u308b\u3082\u306e<\/h2>\n<p>MCB\u306f\u3001\u4fdd\u8b77\u5bfe\u8c61\u306e\u5c0e\u4f53\u306b\u6d41\u308c\u308b\u904e\u96fb\u6d41\u306b\u5fdc\u7b54\u3057\u307e\u3059\u3002RCD\u306f\u3001\u30cb\u30e5\u30fc\u30c8\u30e9\u30eb\u7dda\uff08\u5b58\u5728\u3059\u308b\u5834\u5408\u3092\u542b\u3080\uff09\u3092\u542b\u3080\u3001\u30b3\u30a2\u3092\u901a\u904e\u3059\u308b\u3059\u3079\u3066\u306e\u5c0e\u4f53\u3092\u6d41\u308c\u308b\u96fb\u6d41\u3092\u6bd4\u8f03\u3057\u307e\u3059\u3002\u96fb\u6d41\u306e\u4e00\u90e8\u304c\u5225\u306e\u7d4c\u8def\u3067\u623b\u308b\u5834\u5408\u3001RCD\u306f\u56de\u8def\u3092\u958b\u304f\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u30b7\u30e5\u30ca\u30a4\u30c0\u30fc\u30a8\u30ec\u30af\u30c8\u30ea\u30c3\u30af\u306f\u3001\u305d\u306e\u300cRCD\u52d5\u4f5c\u30ac\u30a4\u30c9\u300d\u3067\u3053\u306e\u96fb\u6d41\u30d0\u30e9\u30f3\u30b9\u306e\u539f\u7406\u3092\u8aac\u660e\u3057\u3066\u3044\u307e\u3059\u3002 <a href=\"https:\/\/www.se.com\/nz\/en\/faqs\/FAQ000210095\/\" rel=\"noopener\">RCD\u52d5\u4f5c\u30ac\u30a4\u30c9<\/a>.<\/p>\n<p>Turning off a branch MCB does not necessarily disconnect that branch&#8217;s neutral. Whether a particular breaker switches one or more poles depends on its design and the installation. Never treat an MCB handle in the off position as proof that wiring is safe to touch.<\/p>\n<h2>\u30cb\u30e5\u30fc\u30c8\u30e9\u30eb-\u30a2\u30fc\u30b9\u9593\u77ed\u7d61\u304c\u4e0a\u6d41\u306eRCD\u3092\u30c8\u30ea\u30c3\u30d7\u3055\u305b\u308b\u4ed5\u7d44\u307f<\/h2>\n<p>Consider several circuits protected by one upstream RCD. A single-pole MCB on one branch is off, but that branch neutral remains connected to the RCD&#8217;s neutral system. If neutral is unintentionally connected to protective earth downstream, current from another operating load may divide between the intended neutral return and the unintended earth path. The RCD can detect the difference and trip. The trip may happen only when another appliance starts, making the switched-off branch easy to overlook.<\/p>\n<p>This explanation follows from the RCD&#8217;s current-balance principle. It does not mean every trip with an MCB off is caused by a neutral\u2013earth fault. Schneider Electric also cautions against an improper downstream neutral\u2013earth connection in its <a href=\"https:\/\/www.se.com\/uk\/en\/faqs\/FA367737\/\" rel=\"noopener\">\u4e2d\u6027\u7dda\u3068\u63a5\u5730\u306b\u95a2\u3059\u308b\u30ac\u30a4\u30c0\u30f3\u30b9<\/a>. The correct bonding arrangement depends on the installation&#8217;s earthing system and local rules.<\/p>\n<h2>\u540c\u69d8\u306b\u307f\u3048\u308b\u305d\u306e\u4ed6\u306e\u539f\u56e0<\/h2>\n<ul>\n<li><strong>\u4e2d\u6027\u7dda\u306e\u5171\u6709\u307e\u305f\u306f\u4ea4\u5dee\uff1a<\/strong> \u8ca0\u8377\u306e\u7dda\uff08\u76f8\uff09\u7dda\u3068\u4e2d\u6027\u7dda\u304c\u7570\u306a\u308bRCD\u30b0\u30eb\u30fc\u30d7\u3092\u901a\u904e\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u3001\u6e2c\u5b9a\u3055\u308c\u305f\u96fb\u6d41\u304c\u5e73\u8861\u3057\u306a\u304f\u306a\u308a\u307e\u3059\u3002<\/li>\n<li><strong>Another circuit&#8217;s leakage:<\/strong> \u30aa\u30d5\u306eMCB\u306f\u7121\u95a2\u4fc2\u3067\u3042\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u3001\u4e0a\u6d41\u306eRCD\u304c\u8907\u6570\u306e\u56de\u8def\u3092\u4fdd\u8b77\u3057\u3066\u3044\u307e\u3059\u3002<\/li>\n<li><strong>\u6e7f\u6c17\u307e\u305f\u306f\u7d76\u7e01\u4f53\u306e\u640d\u50b7\uff1a<\/strong> \u30b1\u30fc\u30d6\u30eb\u3001\u30b8\u30e3\u30f3\u30af\u30b7\u30e7\u30f3\u30dc\u30c3\u30af\u30b9\u3001\u307e\u305f\u306f\u63a5\u7d9a\u3055\u308c\u305f\u6a5f\u5668\u304c\u610f\u56f3\u3057\u306a\u3044\u6f0f\u96fb\u7d4c\u8def\u3092\u63d0\u4f9b\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<li><strong>\u30c7\u30d0\u30a4\u30b9\u307e\u305f\u306f\u914d\u7dda\u306e\u554f\u984c\uff1a<\/strong> \u4e0d\u9069\u5207\u306a\u7d42\u7aef\u51e6\u7406\u307e\u305f\u306f\u6b20\u9665\u306e\u3042\u308b\u30c7\u30d0\u30a4\u30b9\u306f\u3001\u5358\u4e00\u306e\u30c8\u30ea\u30c3\u30d7\u304b\u3089\u63a8\u6e2c\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u30c6\u30b9\u30c8\u306b\u3088\u3063\u3066\u8a55\u4fa1\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n<p>\u56de\u8def\u63a5\u7d9a\u306b\u95a2\u3059\u308b\u500b\u5225\u306e\u8aac\u660e\u306b\u3064\u3044\u3066\u306f\u3001\u5f53\u793e\u306e <a href=\"https:\/\/cnkuangya.com\/ja\/%e3%83%96%e3%83%ad%e3%82%b0\/rcbo-wiring-diagram\/\">RCBO\u914d\u7dda\u30ac\u30a4\u30c9<\/a>. \u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u30c6\u30b9\u30c8\u30dc\u30bf\u30f3\u81ea\u4f53\u304c\u61f8\u5ff5\u4e8b\u9805\u3067\u3042\u308b\u5834\u5408\u306f\u3001\u5f53\u793e\u306e <a href=\"https:\/\/cnkuangya.com\/ja\/%e3%83%96%e3%83%ad%e3%82%b0\/rccb-test-button-not-tripping\/\">RCCB\u30c6\u30b9\u30c8\u30dc\u30bf\u30f3\u306e\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u30ac\u30a4\u30c9<\/a>.<\/p>\n<h2>\u6545\u969c\u3092\u7279\u5b9a\u3059\u308b\u305f\u3081\u306e\u5b89\u5168\u306a\u65b9\u6cd5<\/h2>\n<ol>\n<li>\u3069\u306eRCD\u304c\u30c8\u30ea\u30c3\u30d7\u3057\u305f\u304b\u3001\u3069\u306eMCB\u304c\u30aa\u30f3\u306b\u306a\u3063\u3066\u3044\u308b\u304b\u3001\u305d\u3057\u3066\u30c8\u30ea\u30c3\u30d7\u304c\u7279\u5b9a\u306e\u8ca0\u8377\u3068\u4e00\u81f4\u3059\u308b\u304b\u3069\u3046\u304b\u3092\u8a18\u9332\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u518d\u5ea6\u30c8\u30ea\u30c3\u30d7\u3059\u308b\u30c7\u30d0\u30a4\u30b9\u3092\u7e70\u308a\u8fd4\u3057\u30ea\u30bb\u30c3\u30c8\u3057\u306a\u3044\u3067\u304f\u3060\u3055\u3044\u3002<\/li>\n<li>\u8cc7\u683c\u306e\u3042\u308b\u96fb\u6c17\u6280\u5e2b\u306b\u3001\u9069\u7528\u3055\u308c\u308b\u9694\u96e2\u624b\u9806\u306b\u5f93\u3044\u3001\u6a5f\u5668\u3092\u958b\u304f\u524d\u306b\u56de\u8def\u304c\u901a\u96fb\u3057\u3066\u3044\u306a\u3044\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u3082\u3089\u3063\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<li>\u3069\u306e\u7dda\u3068\u4e2d\u6027\u7dda\u304c\u30da\u30a2\u306b\u306a\u3063\u3066\u3044\u308b\u304b\u3001\u305d\u3057\u3066RCD\u30b0\u30eb\u30fc\u30d7\u9593\u3067\u4e2d\u6027\u7dda\u304c\u5171\u6709\u3055\u308c\u3066\u3044\u308b\u304b\u3092\u78ba\u8a8d\u3057\u3066\u3082\u3089\u3063\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<li>\u63a5\u7d9a\u3055\u308c\u3066\u3044\u308b\u96fb\u5b50\u6a5f\u5668\u306b\u9069\u3057\u305f\u6a5f\u5668\u3068\u30c6\u30b9\u30c8\u65b9\u6cd5\u3092\u4f7f\u7528\u3057\u3066\u3001\u610f\u56f3\u3057\u306a\u3044\u4e2d\u6027\u7dda\u3068\u30a2\u30fc\u30b9\u9593\u306e\u5c0e\u901a\u3001\u6e7f\u6c17\u3001\u304a\u3088\u3073\u7d76\u7e01\u640d\u50b7\u3092\u70b9\u691c\u3057\u3066\u3082\u3089\u3063\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<li>\u539f\u56e0\u304c\u4fee\u6b63\u3055\u308c\u305f\u5f8c\u3001\u4fdd\u8b77\u88c5\u7f6e\u3092\u30c6\u30b9\u30c8\u3057\u3001\u8a2d\u7f6e\u3092\u30b5\u30fc\u30d3\u30b9\u306b\u623b\u3059\u524d\u306b\u7d50\u679c\u3092\u6587\u66f8\u5316\u3057\u3066\u3082\u3089\u3063\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<\/ol>\n<p>\u30c8\u30ea\u30c3\u30d7\u3092\u306a\u304f\u3059\u305f\u3081\u306b\u3001\u4fdd\u8b77\u30a2\u30fc\u30b9\u3092\u5207\u65ad\u3057\u305f\u308a\u3001RCD\u3092\u30d0\u30a4\u30d1\u30b9\u3057\u305f\u308a\u3001\u4e2d\u6027\u7dda\u5c0e\u4f53\u3092\u79fb\u52d5\u3057\u305f\u308a\u3057\u306a\u3044\u3067\u304f\u3060\u3055\u3044\u3002\u3053\u308c\u3089\u306e\u884c\u70ba\u306f\u3001\u4e0d\u53ef\u6b20\u306a\u4fdd\u8b77\u3092\u89e3\u9664\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u30c7\u30d0\u30a4\u30b9\u9078\u629e\u306e\u6587\u8108\u3067\u306f\u3001\u6bd4\u8f03\u3057\u3066\u304f\u3060\u3055\u3044\u3002 <a href=\"https:\/\/cnkuangya.com\/ja\/%e3%83%96%e3%83%ad%e3%82%b0\/rccb-vs-rcd-key-differences-similarities-safest-choice\/\">RCCB\u304a\u3088\u3073RCD\u306e\u7528\u8a9e<\/a> \u304a\u3088\u3073\u30ec\u30d3\u30e5\u30fc <a href=\"https:\/\/cnkuangya.com\/ja\/rccb\/\">RCCB\u30ec\u30f3\u30b8<\/a>\u3002\u914d\u7dda\u969c\u5bb3\u304c\u8a3a\u65ad\u3055\u308c\u305f\u5f8c\u3001RCCB\u307e\u305f\u306fRCBO\u306e\u9078\u5b9a\u306b\u652f\u63f4\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f\u3001 <a href=\"https:\/\/cnkuangya.com\/ja\/contact-us\/\">Kuangya\u307e\u3067\u304a\u554f\u3044\u5408\u308f\u305b\u304f\u3060\u3055\u3044<\/a> \u30b5\u30d7\u30e9\u30a4\u69cb\u6210\u3001\u56de\u8def\u56f3\u3001\u8ca0\u8377\u306e\u7a2e\u985e\u3001\u304a\u3088\u3073\u9069\u7528\u3055\u308c\u308b\u5730\u57df\u306e\u898f\u683c\u306b\u5f93\u3063\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h2>\u3088\u304f\u3042\u308b\u8cea\u554f<\/h2>\n<h3>MCB\u304c\u30aa\u30d5\u306b\u306a\u3063\u3066\u3044\u308b\u5206\u5c90\u56de\u8def\u304c\u3042\u3063\u3066\u3082\u3001RCD\u306f\u30c8\u30ea\u30c3\u30d7\u3057\u307e\u3059\u304b\uff1f<\/h3>\n<p>\u306f\u3044\u3002\u4e0a\u6d41\u306eRCD\u306f\u3001\u4fdd\u8b77\u5bfe\u8c61\u30b0\u30eb\u30fc\u30d7\u306e\u4e0d\u5747\u8861\u3092\u4f9d\u7136\u3068\u3057\u3066\u691c\u51fa\u3067\u304d\u307e\u3059\u3002\u5358\u6975\u5206\u5c90MCB\u306f\u30cb\u30e5\u30fc\u30c8\u30e9\u30eb\u3092\u63a5\u7d9a\u3057\u305f\u307e\u307e\u306b\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u3001\u5225\u306e\u56de\u8def\u304c\u96fb\u6d41\u3092\u4f9b\u7d66\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3>MCB\u3092\u30aa\u30d5\u306b\u3059\u308b\u3068\u30cb\u30e5\u30fc\u30c8\u30e9\u30eb\u304c\u7d76\u7e01\u3055\u308c\u307e\u3059\u304b\uff1f<\/h3>\n<p>Not necessarily. Check the actual device and wiring diagram. 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