{"id":1879,"date":"2026-09-30T00:48:10","date_gmt":"2026-09-30T00:48:10","guid":{"rendered":"https:\/\/ritoks.com\/?p=1879"},"modified":"2026-10-05T15:26:21","modified_gmt":"2026-10-05T15:26:21","slug":"mpcb-breaking-capacity-motor-fault-evidence","status":"publish","type":"post","link":"https:\/\/ritoks.com\/ja\/mpcb-breaking-capacity-motor-fault-evidence\/","title":{"rendered":"MPCB\u306e\u906e\u65ad\u80fd\u529b\u3068\u30e2\u30fc\u30bf\u30fc\u56de\u8def\u306e\u6545\u969c\u306e\u5146\u5019"},"content":{"rendered":"

An MPCB’s adjustable motor-current range does not tell you whether it can interrupt the short circuit available at the panel. Breaking capacity is a separate rating tied to the device, system voltage and applicable test conditions. Buyers need the prospective fault current at the MPCB location and exact-model interruption evidence before approving a motor-control bill of materials.<\/p>\n

\u3053\u306e\u30ac\u30a4\u30c9\u306f\u3001\u904e\u8ca0\u8377\u8a2d\u5b9a\u3084\u30b9\u30bf\u30fc\u30bf\u30fc\u306e\u8a2d\u8a08\u5168\u4f53\u3067\u306f\u306a\u304f\u3001\u6545\u969c\u306e\u8a3c\u62e0\u306b\u7126\u70b9\u3092\u5f53\u3066\u3066\u3044\u307e\u3059\u3002\u672a\u691c\u8a3c\u306eRITOKS\u88fd\u30d6\u30ec\u30fc\u30ab\u30fc\u306b\u5177\u4f53\u7684\u306a\u5024\u3092\u5272\u308a\u5f53\u3066\u308b\u3053\u3068\u306f\u305b\u305a\u3001Icu\u3001Ics\u3001\u96fb\u5727\u3001\u304a\u3088\u3073\u7d44\u307f\u5408\u308f\u305b\u306e\u8abf\u6574\u306b\u95a2\u3057\u3066\u78ba\u8a8d\u3059\u3079\u304d\u4e8b\u9805\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002.<\/p>\n

MPCB\u304c\u8a2d\u7f6e\u3055\u308c\u3066\u3044\u308b\u5834\u6240\u306e\u6545\u969c\u96fb\u6d41\u3092\u7279\u5b9a\u3059\u308b<\/h2>\n

\u307e\u305a\u306f\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u77ed\u7d61\u89e3\u6790\u304b\u3089\u59cb\u3081\u307e\u3057\u3087\u3046\u3002\u30e2\u30fc\u30bf\u30fc\u5206\u5c90\u306b\u304a\u3051\u308b\u4e88\u60f3\u96fb\u6d41\u306f\u3001\u5909\u5727\u5668\u3084\u96fb\u6e90\u306e\u30a4\u30f3\u30d4\u30fc\u30c0\u30f3\u30b9\u3001\u30b1\u30fc\u30d6\u30eb\u3001\u4e0a\u6d41\u306e\u8a2d\u5099\u3001\u304a\u3088\u3073\u5177\u4f53\u7684\u306a\u8a2d\u7f6e\u4f4d\u7f6e\u306b\u3088\u3063\u3066\u7570\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u914d\u96fb\u76e4\u306e\u5f15\u8fbc\u7dda\u3084\u4ed6\u306e\u30e2\u30fc\u30bf\u30fc\u30d5\u30a3\u30fc\u30c0\u30fc\u306b\u304a\u3051\u308b\u5229\u7528\u53ef\u80fd\u306a\u6545\u969c\u96fb\u6d41\u3068\u5fc5\u305a\u3057\u3082\u540c\u3058\u3068\u306f\u9650\u308a\u307e\u305b\u3093\u3002.<\/p>\n

Record the study’s assumptions and the operating configurations it covers. Alternate supplies, generator operation or future transformer changes can alter fault duty. If the study is incomplete, identify the breaker selection as provisional. A supplier may suggest candidates but cannot validate the installation from motor power alone.<\/p>\n

Keep the fault level separate from the motor’s normal and starting current. The MPCB has to carry and protect the motor under ordinary duty and also interrupt or participate in clearing a much higher fault. One ampere label cannot stand for both jobs.<\/p>\n

\u4e2d\u65ad\u30c6\u30fc\u30d6\u30eb\u306b\u6b63\u78ba\u306a\u96fb\u5727\u3092\u7167\u5408\u3057\u3066\u304f\u3060\u3055\u3044<\/h2>\n

Breaking capacity may vary substantially across voltage values for one model. Schneider Electric’s published motor-circuit-breaker datasheets show different Icu and Ics entries at different AC voltages. The numbers are Schneider product values, not a RITOKS specification; they demonstrate why the exact system voltage belongs beside the rating.<\/p>\n

Ask for the exact device order code, pole configuration, rated operational voltage and short-circuit table. Do not compare a candidate’s best-looking rating at a lower voltage with the project’s higher-voltage duty. Note frequency and any conditional or upstream-protection requirement in the data.<\/p>\n

\u30e2\u30fc\u30bf\u30fc\u96fb\u6d41\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u3082\u306e\u306e\u3001\u8a2d\u7f6e\u96fb\u5727\u306b\u304a\u3051\u308b\u6545\u969c\u6642\u52d5\u4f5c\u80fd\u529b\u304c\u6587\u66f8\u3067\u660e\u8a18\u3055\u308c\u3066\u3044\u306a\u3044\u30d6\u30ec\u30fc\u30ab\u30fc\u306f\u3001\u6280\u8853\u7684\u306a\u691c\u8a0e\u304c\u884c\u308f\u308c\u308b\u307e\u3067\u958b\u653e\u72b6\u614b\u306b\u3057\u3066\u304a\u304f\u3079\u304d\u3067\u3042\u308b\u3002\u30d5\u30ec\u30fc\u30e0\u30b5\u30a4\u30ba\u3092\u5927\u304d\u304f\u3057\u305f\u304b\u3089\u3068\u3044\u3063\u3066\u3001\u5fc5\u305a\u3057\u3082\u554f\u984c\u304c\u89e3\u6c7a\u3059\u308b\u308f\u3051\u3067\u306f\u306a\u3044\u3002\u305d\u308c\u306b\u3088\u308a\u3001\u904e\u8ca0\u8377\u7bc4\u56f2\u3001\u5354\u8abf\u52d5\u4f5c\u3001\u304a\u3088\u3073\u914d\u96fb\u76e4\u306e\u5236\u7d04\u304c\u7570\u306a\u308b\u53ef\u80fd\u6027\u3082\u3042\u308b\u3002.<\/p>\n

\"\u30e2\u30fc\u30bf\u30fc\u30d5\u30a3\u30fc\u30c0\u30fc\u306e\u6545\u969c\u96fb\u6d41\u3068\u3001\u96fb\u5727\u306b\u5fdc\u3058\u305f\u6b63\u78ba\u306aMPCB\u5b9a\u683c\u3092\u5bfe\u5fdc\u4ed8\u3051\u305f\u56f3\"
\u7279\u5b9a\u306e\u5834\u6240\u306b\u304a\u3051\u308b\u6545\u969c\u96fb\u6d41\u3092\u3001\u540c\u3058\u96fb\u5727\u306b\u304a\u3051\u308b\u906e\u65ad\u5b9a\u683c\u306b\u7167\u3089\u3057\u5408\u308f\u305b\u308b\u3002.<\/figcaption><\/figure>\n

ICU\u3068ICS\u3092\u6df7\u540c\u305b\u305a\u306b\u7406\u89e3\u3059\u308b<\/h2>\n

IEC-style product data may distinguish ultimate short-circuit breaking capacity, Icu, from service short-circuit breaking capacity, Ics. The two refer to different test and post-fault performance criteria. Schneider Electric’s user guide describes Ics as a service rating expressed relative to Icu for its devices. Do not treat the values as synonyms or assume their relationship is the same for every model.<\/p>\n

\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u4ed5\u69d8\u66f8\u306b\u306f\u3001\u9069\u7528\u3055\u308c\u308b\u898f\u683c\u304a\u3088\u3073\u73fe\u5730\u306e\u8981\u4ef6\u306b\u57fa\u3065\u304d\u3001\u3069\u306e\u5b9a\u683c\u5024\u3092\u78ba\u8a8d\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u304b\u3092\u660e\u8a18\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u6545\u969c\u767a\u751f\u5f8c\u3001\u906e\u65ad\u5668\u306b\u3069\u306e\u3088\u3046\u306a\u52d5\u4f5c\u304c\u671f\u5f85\u3055\u308c\u308b\u304b\u3001\u307e\u305f\u73fe\u5834\u3067\u306f\u3069\u306e\u3088\u3046\u306a\u70b9\u691c\u307e\u305f\u306f\u4ea4\u63db\u624b\u9806\u304c\u3068\u3089\u308c\u308b\u304b\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u305f\u3068\u3048\u305d\u306e\u6a5f\u5668\u306b\u30b5\u30fc\u30d3\u30b9\u906e\u65ad\u5bb9\u91cf\u306e\u5b9a\u683c\u5024\u304c\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u305f\u3068\u3057\u3066\u3082\u3001\u6545\u969c\u6392\u9664\u306f\u901a\u5e38\u306e\u958b\u9589\u64cd\u4f5c\u3068\u306f\u7570\u306a\u308a\u307e\u3059\u3002.<\/p>\n

Do not infer the exact device’s Ics from a family brochure or a competitor product. Obtain the model-specific table at the project voltage and record it with the design. If the supplier gives Ics as a percentage of Icu, calculate or quote the corresponding value using that model’s data, not a generic rule.<\/p>\n

\u5c0e\u5165\u90e8\u5206\u306e\u7d44\u307f\u5408\u308f\u305b\u3068\u9023\u643a\u306e\u78ba\u8a8d<\/h2>\n

MPCB\u306f\u3001\u591a\u304f\u306e\u5834\u5408\u3001\u30b3\u30f3\u30bf\u30af\u30bf\u3084\u305d\u306e\u4ed6\u306e\u59cb\u52d5\u7528\u90e8\u54c1\u3068\u7d44\u307f\u5408\u308f\u305b\u3066\u8a2d\u7f6e\u3055\u308c\u307e\u3059\u3002\u77ed\u7d61\u6642\u306e\u3053\u306e\u7d44\u307f\u5408\u308f\u305b\u306e\u6027\u80fd\u306b\u3064\u3044\u3066\u306f\u3001\u72ec\u81ea\u306e\u8a66\u9a13\u306b\u57fa\u3065\u304f\u5354\u8abf\u57fa\u6e96\u304c\u5b9a\u3081\u3089\u308c\u3066\u3044\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u30e1\u30fc\u30ab\u30fc\u306e\u5354\u8abf\u8868\u306b\u306f\u3001\u5177\u4f53\u7684\u306a\u6a5f\u5668\u304a\u3088\u3073\u6761\u4ef6\u304c\u660e\u8a18\u3055\u308c\u3066\u3044\u308b\u306f\u305a\u3067\u3059\u3002\u540c\u30b5\u30a4\u30ba\u306e\u30b3\u30f3\u30bf\u30af\u30bf\u3084\u3001\u5909\u66f4\u3055\u308c\u305f\u904e\u8ca0\u8377\u4fdd\u8b77\u90e8\u54c1\u3092\u4f7f\u7528\u3057\u305f\u5834\u5408\u3001\u4ee5\u524d\u306e\u7d50\u679c\u304c\u305d\u306e\u307e\u307e\u9069\u7528\u3055\u308c\u308b\u3068\u306f\u9650\u308a\u307e\u305b\u3093\u3002.<\/p>\n

Ask whether the cited fault rating is for the MPCB alone or conditional on a specified upstream device or combination. Record any required fuse, contactor, busbar or terminal accessory. The result should be checked against the panel’s prospective fault current and applicable assembly design requirements.<\/p>\n

Schneider Electric’s motor-starter catalogue provides examples of coordinated combinations, but those tables are not transferable to unrelated RITOKS devices. Request RITOKS-specific evidence where a combination claim is necessary. Without it, keep the assembly rating question unresolved.<\/p>\n

\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u306e\u6319\u52d5\u306f\u5206\u96e2\u3057\u3066\u304a\u304f<\/h2>\n

\u8abf\u6574\u53ef\u80fd\u306a\u904e\u8ca0\u8377\u7bc4\u56f2\u306f\u3001\u30e2\u30fc\u30bf\u30fc\u306e\u6301\u7d9a\u96fb\u6d41\u306b\u5bfe\u5fdc\u3059\u308b\u3082\u306e\u3067\u3059\u3002\u906e\u65ad\u80fd\u529b\u306f\u3001\u5927\u96fb\u6d41\u306e\u6545\u969c\u306b\u5bfe\u5fdc\u3059\u308b\u3082\u306e\u3067\u3059\u3002\u3042\u308b\u88c5\u7f6e\u306f\u3001\u30e2\u30fc\u30bf\u30fc\u306b\u5bfe\u3057\u3066\u9069\u5207\u306b\u8abf\u6574\u3055\u308c\u3066\u3044\u3066\u3082\u3001\u8a2d\u7f6e\u5834\u6240\u306e\u77ed\u7d61\u8ca0\u8377\u8981\u4ef6\u3092\u6e80\u305f\u3057\u3066\u3044\u306a\u3044\u5834\u5408\u3084\u3001\u6545\u969c\u8ca0\u8377\u8981\u4ef6\u306f\u6e80\u305f\u3057\u3066\u3044\u3066\u3082\u904e\u8ca0\u8377\u7bc4\u56f2\u304c\u4e0d\u9069\u5207\u306a\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u78ba\u8a8d\u4e8b\u9805\u306f\u3044\u305a\u308c\u3082\u3001\u627f\u8a8d\u8a18\u9332\u306b\u8a18\u8f09\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002.<\/p>\n

\u59cb\u52d5\u96fb\u6d41\u304a\u3088\u3073\u52a0\u901f\u6642\u9593\u306f\u3001\u30c8\u30ea\u30c3\u30d7\u7279\u6027\u3068\u7167\u3089\u3057\u5408\u308f\u305b\u3066\u78ba\u8a8d\u3057\u3001\u901a\u5e38\u306e\u59cb\u52d5\u306b\u3088\u3063\u3066\u4e0d\u5fc5\u8981\u306a\u52d5\u4f5c\u304c\u767a\u751f\u3057\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u5236\u52d5\u80fd\u529b\u306b\u95a2\u3059\u308b\u61f8\u5ff5\u3092\u88dc\u3046\u305f\u3081\u306b\u904e\u8ca0\u8377\u8a2d\u5b9a\u5024\u3092\u5927\u304d\u304f\u3057\u3066\u306f\u3044\u3051\u307e\u305b\u3093\u3002\u3053\u308c\u3089\u306f\u5225\u500b\u306e\u8a2d\u8a08\u4e0a\u306e\u554f\u984c\u3067\u3059\u3002\u898b\u7a4d\u4f9d\u983c\u66f8\uff08RFQ\uff09\u306b\u306f\u3001\u30e2\u30fc\u30bf\u30fc\u306e\u9298\u677f\u60c5\u5831\u3068\u6545\u969c\u89e3\u6790\u7d50\u679c\u306e\u4e21\u65b9\u3092\u8a18\u8f09\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002.<\/p>\n

\u8a3c\u62e0\u306e\u9023\u9396\u3092\u53ef\u8996\u5316\u3059\u308b<\/h2>\n
\u54c1\u76ee<\/th>\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u5b9f\u7e3e<\/th>\u6a5f\u5668\u306e\u8a3c\u62e0<\/th><\/tr><\/thead>
\u30b7\u30b9\u30c6\u30e0\u96fb\u5727<\/td>\u30e2\u30fc\u30bf\u30fc\u30d5\u30a3\u30fc\u30c0\u30fc\u306e\u4f9b\u7d66\u6761\u4ef6<\/td>\u5b9a\u683c\u52d5\u4f5c\u96fb\u5727\uff08\u6b63\u78ba\u306a\u5024\uff09<\/td><\/tr>
\u6545\u969c\u5bfe\u5fdc<\/td>MPCB\u306b\u304a\u3051\u308b\u898b\u8fbc\u307f\u96fb\u6d41<\/td>\u6240\u5b9a\u306e\u96fb\u5727\u306b\u304a\u3051\u308bICU\/ICS<\/td><\/tr>
\u7d44\u307f\u5408\u308f\u305b<\/td>\u30b3\u30f3\u30bf\u30af\u30bf\u304a\u3088\u3073\u4e0a\u6d41\u5074\u306e\u6a5f\u5668<\/td>\u8abf\u6574\u8868\u307e\u305f\u306f\u6761\u4ef6\u4ed8\u304d\u8868<\/td><\/tr>
\u30e2\u30fc\u30bf\u30fc\u4fdd\u8b77<\/td>\u9298\u677f\u3068\u958b\u59cb\u30d7\u30ed\u30d5\u30a1\u30a4\u30eb<\/td>\u8abf\u6574\u304a\u3088\u3073\u30c8\u30ea\u30c3\u30d7\u7279\u6027<\/td><\/tr>
\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb<\/td>\u30d1\u30cd\u30eb\u306e\u914d\u7dda\u3068\u8a2d\u7f6e\u74b0\u5883<\/td>\u7aef\u5b50\u304a\u3088\u3073\u53d6\u308a\u4ed8\u3051\u624b\u9806<\/td><\/tr><\/tbody><\/table><\/figure>\n

PASS\u306b\u306f\u3001\u6b63\u78ba\u306a\u8cc7\u6599\u540d\u3068\u6ce8\u6587\u30b3\u30fc\u30c9\u3092\u8a18\u8f09\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u307e\u3060\u4e0d\u660e\u306a\u9805\u76ee\u304c\u3042\u308b\u5834\u5408\u306f\u3001\u300c\u672a\u5b9a\u300d\u3068\u8a18\u5165\u3057\u3001\u8ab0\u304c\u305d\u308c\u3092\u63d0\u4f9b\u3059\u308b\u304b\u660e\u8a18\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u4e0d\u8db3\u3057\u3066\u3044\u308b\u8a3c\u62e0\u3092\u3001\u5bb6\u65cf\u306b\u95a2\u3059\u308b\u9b45\u529b\u7684\u306a\u8a18\u8ff0\u3067\u88dc\u3063\u3066\u306f\u3044\u3051\u307e\u305b\u3093\u3002.<\/p>\n

\"\u30e2\u30fc\u30bf\u30fc\u306e\u904e\u8ca0\u8377\u3001MPCB\u306eIcu\u30fbIcs\u3001\u304a\u3088\u3073\u30b9\u30bf\u30fc\u30bf\u30fc\u306e\u9023\u52d5\u3092\u533a\u5225\u3059\u308b\u305f\u3081\u306e\u30a8\u30d3\u30c7\u30f3\u30b9\u30de\u30c8\u30ea\u30c3\u30af\u30b9\"
\u30e2\u30fc\u30bf\u30fc\u96fb\u6d41\u3001\u30c7\u30d0\u30a4\u30b9\u306e\u906e\u65ad\u3001\u304a\u3088\u3073\u7d44\u307f\u5408\u308f\u305b\u30fb\u5354\u8abf\u306b\u95a2\u3059\u308b\u30c1\u30a7\u30c3\u30af\u3092\u500b\u5225\u306b\u5b9f\u65bd\u3059\u308b\u3002.<\/figcaption><\/figure>\n

\u88fd\u54c1\u306e\u4ee3\u66ff\u304c\u884c\u308f\u308c\u305f\u5f8c\u3001\u3069\u306e\u3088\u3046\u306a\u5909\u5316\u304c\u751f\u3058\u308b\u304b<\/h2>\n

\u4ee3\u66ff\u3068\u306a\u308bMPCB\u306f\u3001\u540c\u3058\u8a2d\u7f6e\u5834\u6240\u306e\u96fb\u5727\u304a\u3088\u3073\u60f3\u5b9a\u3055\u308c\u308b\u6545\u969c\u96fb\u6d41\u306e\u6761\u4ef6\u4e0b\u3067\u8a55\u4fa1\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306eIcu\u3001Ics\u3001\u904e\u8ca0\u8377\u7bc4\u56f2\u3001\u30c8\u30ea\u30c3\u30d7\u7279\u6027\u66f2\u7dda\u3001\u7aef\u5b50\u5f62\u72b6\u3001\u304a\u3088\u3073\u65e2\u5b58\u306e\u30b3\u30f3\u30bf\u30af\u30bf\u3068\u306e\u4e92\u63db\u6027\u3092\u6bd4\u8f03\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u30d5\u30ec\u30fc\u30e0\u30b5\u30a4\u30ba\u3084\u30e2\u30fc\u30bf\u30fc\u51fa\u529b\u30e9\u30d9\u30eb\u304c\u4e00\u81f4\u3057\u3066\u3044\u308b\u304b\u3089\u3068\u3044\u3063\u3066\u3001\u6545\u969c\u6642\u306e\u6027\u80fd\u304c\u540c\u7b49\u3067\u3042\u308b\u3068\u306f\u9650\u308a\u307e\u305b\u3093\u3002.<\/p>\n

\u5143\u306e\u6ce8\u6587\u30b3\u30fc\u30c9\u3068\u63d0\u6848\u3055\u308c\u305f\u6ce8\u6587\u30b3\u30fc\u30c9\u3001\u304a\u3088\u3073\u5909\u66f4\u306e\u7406\u7531\u3092\u8a18\u9332\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u30b5\u30d7\u30e9\u30a4\u30e4\u30fc\u304c\u3001\u7279\u5b9a\u306e\u4e0a\u6d41\u5074\u306e\u30d2\u30e5\u30fc\u30ba\u307e\u305f\u306f\u4ed8\u5c5e\u54c1\u3092\u4f7f\u7528\u3057\u305f\u5834\u5408\u3001\u3088\u308a\u9ad8\u3044\u6545\u969c\u5b9a\u683c\u3092\u4e3b\u5f35\u3059\u308b\u5834\u5408\u306f\u3001\u305d\u306e\u6761\u4ef6\u3092\u30d1\u30cd\u30eb\u56f3\u9762\u304a\u3088\u3073\u90e8\u54c1\u8868\u306b\u8ffd\u52a0\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u8a2d\u7f6e\u6e08\u307f\u306e\u30a2\u30bb\u30f3\u30d6\u30ea\u306b\u5b58\u5728\u3057\u306a\u3044\u6761\u4ef6\u306f\u3001\u5b9a\u683c\u306e\u898b\u76f4\u3057\u306b\u304a\u3044\u3066\u8003\u616e\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002.<\/p>\n

\u8a66\u904b\u8ee2\u304a\u3088\u3073\u4fdd\u5b88\u306e\u8a18\u9332\u3092\u4fdd\u7ba1\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u5b9f\u969b\u306b\u77ed\u7d61\u304c\u767a\u751f\u3057\u305f\u5f8c\u306f\u3001\u30e1\u30fc\u30ab\u30fc\u304a\u3088\u3073\u73fe\u5834\u306e\u624b\u9806\u306b\u5f93\u3063\u3066\u3001\u70b9\u691c\u3001\u8a66\u9a13\u3001\u307e\u305f\u306f\u4ea4\u63db\u3092\u884c\u3063\u3066\u304f\u3060\u3055\u3044\u3002\u30ea\u30bb\u30c3\u30c8\u53ef\u80fd\u306a\u30cf\u30f3\u30c9\u30eb\u304c\u3042\u308b\u304b\u3089\u3068\u3044\u3063\u3066\u3001\u305d\u306e\u88c5\u7f6e\u304c\u5f15\u304d\u7d9a\u304d\u4f7f\u7528\u306b\u9069\u3057\u3066\u3044\u308b\u3068\u306f\u9650\u308a\u307e\u305b\u3093\u3002.<\/p>\n

\u6761\u4ef6\u4ed8\u304d\u8a55\u4fa1\u306b\u3064\u3044\u3066\u306f\u614e\u91cd\u306b\u691c\u8a0e\u3059\u308b<\/h2>\n

\u30b5\u30d7\u30e9\u30a4\u30e4\u30fc\u306f\u3001\u7279\u5b9a\u306e\u4e0a\u6d41\u5074\u30d2\u30e5\u30fc\u30ba\u3084\u305d\u306e\u4ed6\u306e\u4fdd\u8b77\u90e8\u54c1\u3092\u4f7f\u7528\u3057\u305f\u5834\u5408\u306b\u306e\u307f\u9054\u6210\u3055\u308c\u308b\u9ad8\u3044\u77ed\u7d61\u8010\u529b\u3092\u63d0\u793a\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306a\u6570\u5024\u306f\u3001\u305d\u306eMPCB\u3092\u4f7f\u7528\u3059\u308b\u3059\u3079\u3066\u306e\u8a2d\u7f6e\u74b0\u5883\u306b\u304a\u3051\u308b\u5358\u72ec\u306e\u5b9a\u683c\u5024\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u5177\u4f53\u7684\u306a\u7d44\u307f\u5408\u308f\u305b\u3001\u96fb\u5727\u3001\u4e0a\u6d41\u5074\u30c7\u30d0\u30a4\u30b9\u306e\u5b9a\u683c\u3001\u304a\u3088\u3073\u8a2d\u7f6e\u6761\u4ef6\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u305d\u306e\u5f8c\u3001\u63d0\u6848\u3055\u308c\u3066\u3044\u308b\u30d1\u30cd\u30eb\u306b\u5b9f\u969b\u306b\u305d\u308c\u3089\u306e\u8981\u7d20\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u3053\u3068\u3001\u304a\u3088\u3073\u95a2\u9023\u3059\u308b\u6a5f\u5668\u306e\u4f7f\u7528\u304c\u8a31\u53ef\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002.<\/p>\n

\u4e0b\u6d41\u5074\u306e\u30b3\u30f3\u30bf\u30af\u30bf\u3084\u30d0\u30b9\u30d0\u30fc\u3082\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u914d\u96fb\u76e4\u306b\u306f\u9069\u5207\u306a\u906e\u65ad\u6027\u80fd\u3092\u6301\u3064MPCB\u304c\u642d\u8f09\u3055\u308c\u3066\u3044\u308b\u4e00\u65b9\u3067\u3001\u30e2\u30fc\u30bf\u30fc\u30b9\u30bf\u30fc\u30bf\u30fc\u5185\u306e\u5225\u306e\u90e8\u54c1\u306b\u306f\u5fc5\u8981\u306a\u5354\u8abf\u52d5\u4f5c\u306e\u8a3c\u660e\u304c\u306a\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u30a2\u30bb\u30f3\u30d6\u30ea\u8a2d\u8a08\u8005\u306f\u3001\u6545\u969c\u7d4c\u8def\u5168\u4f53\u3092\u8a55\u4fa1\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u3053\u308c\u304c\u3001\u88fd\u54c1\u30c7\u30fc\u30bf\u30b7\u30fc\u30c8\u304b\u3089\u8ee2\u8a18\u3057\u305fkA\u5024\u3060\u3051\u3067\u306f\u3001\u914d\u96fb\u76e4\u306e\u627f\u8a8d\u306b\u306f\u4e0d\u5341\u5206\u3067\u3042\u308b\u7406\u7531\u306e\u4e00\u3064\u3067\u3059\u3002.<\/p>\n

If the site may be supplied from alternate sources, identify the most demanding credible configuration. Generator contribution, transformer replacement or parallel feeds can change the available fault at the branch. Use the project’s short-circuit study instead of assuming the worst case is always the normal utility connection.<\/p>\n

\u8a18\u8f09\u3055\u308c\u305f\u30c7\u30fc\u30bf\u304cIcu\u3001Ics\u3001\u3042\u308b\u3044\u306f\u6761\u4ef6\u4ed8\u304d\u5b9a\u683c\u306e\u3044\u305a\u308c\u3067\u3042\u308b\u304b\u3092\u8a18\u9332\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u3053\u308c\u3089\u306e\u7528\u8a9e\u306f\u3001\u5f8c\u306e\u4fdd\u5b88\u4f5c\u696d\u306b\u304a\u3044\u3066\u7570\u306a\u308b\u57fa\u6e96\u306b\u57fa\u3065\u304f\u8acb\u6c42\u304c\u6df7\u540c\u3055\u308c\u306a\u3044\u3088\u3046\u3001\u8abf\u9054\u66f8\u985e\u304a\u3088\u3073\u7ae3\u5de5\u8a18\u9332\u306b\u304a\u3044\u3066\u660e\u78ba\u306b\u8868\u8a18\u3057\u3066\u304a\u304f\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002kA\u3068\u3044\u3046\u6570\u5024\u3060\u3051\u3067\u306f\u305d\u306e\u610f\u5473\u3092\u6210\u3059\u6761\u4ef6\u304c\u4e0d\u660e\u3068\u306a\u308b\u305f\u3081\u3001\u5404\u6570\u5024\u306e\u6a2a\u306b\u306f\u5b9a\u683c\u96fb\u5727\u3092\u4f75\u8a18\u3057\u3066\u304f\u3060\u3055\u3044\u3002.<\/p>\n

RITOKS\u306e\u30ab\u30c6\u30b4\u30ea\u3068\u691c\u7d22\u30d1\u30b9<\/h2>\n

\u4ee5\u4e0b\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044 MPCB\u306e\u5206\u985e<\/a> \u305d\u3057\u3066 GYMP7 \u30e2\u30fc\u30bf\u30fc\u4fdd\u8b77\u7528\u30d6\u30ec\u30fc\u30ab\u30fc\u30b7\u30ea\u30fc\u30ba<\/a> for commercial context. Those pages do not themselves resolve the project’s available fault current or the exact variant’s breaking data.<\/p>\n

1\u884c\u306e\u5f62\u5f0f\u3067\u3001\u8abf\u67fb\u7d50\u679c\u3001\u30e2\u30fc\u30bf\u30fc\u306e\u9298\u677f\u60c5\u5831\u3001\u30b3\u30f3\u30bf\u30af\u30bf\u306e\u6ce8\u6587\u30b3\u30fc\u30c9\u3001\u304a\u3088\u3073\u5fc5\u8981\u306a\u96fb\u5727\u3092\u4ee5\u4e0b\u306e\u5b9b\u5148\u307e\u3067\u304a\u9001\u308a\u304f\u3060\u3055\u3044\u3002 RITOKS\u3078\u306e\u304a\u554f\u3044\u5408\u308f\u305b<\/a>. \u6b63\u78ba\u306a\u30c7\u30fc\u30bf\u30b7\u30fc\u30c8\u3001\u8010\u7834\u65ad\u5bb9\u91cf\u8868\u3001\u304a\u3088\u3073\u9069\u5408\u8a3c\u660e\u66f8\u985e\u306e\u63d0\u51fa\u3092\u6c42\u3081\u3066\u304f\u3060\u3055\u3044\u3002\u3044\u305a\u308c\u304b\u306e\u66f8\u985e\u304c\u4e0d\u8db3\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u3001\u6545\u969c\u63a8\u5b9a\u5024\u3092\u6982\u7b97\u3057\u305f\u308a\u3001\u5b9a\u683c\u5024\u3092\u501f\u7528\u3057\u305f\u308a\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u6700\u7d42\u627f\u8a8d\u3092\u4fdd\u7559\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002.<\/p>\n

\u3088\u304f\u3042\u308b\u8cea\u554f<\/h2>\n

Is an MPCB’s motor-current range its breaking capacity?<\/h3>\n

\u3044\u3044\u3048\u3002\u8abf\u6574\u7bc4\u56f2\u306f\u3001\u30e2\u30fc\u30bf\u30fc\u306e\u904e\u8ca0\u8377\u9078\u5b9a\u306b\u95a2\u3059\u308b\u3082\u306e\u3067\u3059\u3002\u906e\u65ad\u80fd\u529b\u306f\u3001\u898f\u5b9a\u306e\u96fb\u5727\u306b\u304a\u3044\u3066\u60f3\u5b9a\u3055\u308c\u308b\u77ed\u7d61\u96fb\u6d41\u3092\u906e\u65ad\u3067\u304d\u308b\u80fd\u529b\u306b\u95a2\u3059\u308b\u3082\u306e\u3067\u3059\u3002.<\/p>\n

\u305d\u306e\u88fd\u54c1\u30d5\u30a1\u30df\u30ea\u30fc\u3067\u8a18\u8f09\u3055\u308c\u3066\u3044\u308b\u6700\u3082\u9ad8\u3044ICU\u5024\u3092\u4f7f\u7528\u3057\u3066\u3082\u3088\u3044\u3067\u3057\u3087\u3046\u304b\uff1f<\/h3>\n

\u8a72\u5f53\u3059\u308b\u30b7\u30b9\u30c6\u30e0\u96fb\u5727\u304a\u3088\u3073\u6761\u4ef6\u4e0b\u306b\u304a\u3044\u3066\u3001\u305d\u306e\u5019\u88dc\u6a5f\u7a2e\u306b\u306e\u307f\u9069\u7528\u3055\u308c\u307e\u3059\u3002\u5b9a\u683c\u306f\u96fb\u5727\u3084\u30d0\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3\u306b\u3088\u3063\u3066\u7570\u306a\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002.<\/p>\n

\u6545\u969c\u306e\u906e\u65ad\u306b\u6210\u529f\u3059\u308c\u3070\u3001\u76f4\u3061\u306b\u518d\u5229\u7528\u304c\u53ef\u80fd\u306b\u306a\u308b\u306e\u3067\u3057\u3087\u3046\u304b\uff1f<\/h3>\n

Not automatically. Follow the device manufacturer’s post-fault instructions and site inspection policy, considering the documented service breaking rating and fault severity.<\/p>\n

\u7d50\u8ad6\u3068\u3057\u3066<\/h2>\n

MPCB\u306e\u906e\u65ad\u5bb9\u91cf\u8a55\u4fa1\u306f\u3001\u8a2d\u7f6e\u5834\u6240\u306b\u5fdc\u3058\u305f\u6545\u969c\u89e3\u6790\u304b\u3089\u59cb\u307e\u308a\u3001\u6b63\u78ba\u306a\u30e2\u30c7\u30eb\u306b\u57fa\u3065\u304f\u96fb\u5727\u304a\u3088\u3073\u906e\u65ad\u5b9f\u7e3e\u306e\u691c\u8a3c\u3067\u7de0\u3081\u304f\u304f\u3089\u308c\u307e\u3059\u3002\u30e2\u30fc\u30bf\u30fc\u306e\u904e\u8ca0\u8377\u8a66\u9a13\u3084\u30b9\u30bf\u30fc\u30bf\u30fc\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\u8a66\u9a13\u3082\u4f75\u305b\u3066\u5b9f\u65bd\u3059\u3079\u304d\u3067\u3059\u304c\u3001\u3053\u308c\u3089\u3092\u672c\u8a55\u4fa1\u306e\u4ee3\u308f\u308a\u3068\u3057\u3066\u7528\u3044\u3066\u306f\u306a\u308a\u307e\u305b\u3093\u3002\u660e\u78ba\u306a\u691c\u8a3c\u306e\u9023\u9396\u306f\u3001\u6839\u62e0\u306e\u306a\u3044\u5927\u304d\u306akA\u3068\u3044\u3046\u6570\u5024\u3088\u308a\u3082\u306f\u308b\u304b\u306b\u4fa1\u5024\u304c\u3042\u308a\u307e\u3059\u3002.<\/p>\n

\u53c2\u8003\u6587\u732e<\/h2>\n