{"id":3409,"date":"2026-03-24T09:00:00","date_gmt":"2026-03-24T01:00:00","guid":{"rendered":"https:\/\/eqsvq3fzct.wpdns.site\/blog\/advanced-protection-of-800v-mccb-electronic-jcr3hm-rcd-with-built-in-lsig-trip-unit\/"},"modified":"2026-10-20T10:37:31","modified_gmt":"2026-10-20T02:37:31","slug":"800v-mccb-%e9%9b%bb%e5%ad%90%e5%bc%8f-jcr3hm-rcd-%e3%81%ae%e9%ab%98%e5%ba%a6%e3%81%aa%e4%bf%9d%e8%ad%b7%e6%a9%9f%e8%83%bd%e3%80%81%e5%86%85%e8%94%b5%e3%81%ae-lsig-%e3%83%88%e3%83%aa%e3%83%83%e3%83%97","status":"publish","type":"post","link":"https:\/\/w9-group.com\/ja\/blog\/advanced-protection-of-800v-mccb-electronic-jcr3hm-rcd-with-built-in-lsig-trip-unit\/","title":{"rendered":"JCR3HM RCCB vs LSIG MCCB: \u4fdd\u8b77\u6a5f\u80fd\u3068\u5b9a\u683c\u5236\u9650"},"content":{"rendered":"

The older title combines two different device descriptions: an 800 V electronic MCCB with LSIG and the JCR3HM RCD. They must not be treated as one product. The current JCR3HM listing identifies an RCCB<\/a> \u6b8b\u7559\u96fb\u6d41\u4fdd\u8b77\u7528\u3067\u3042\u308a\u3001\u5225\u9014\u5354\u8abf\u3055\u308c\u305f\u904e\u96fb\u6d41\u4fdd\u8b77\u306e\u8a2d\u7f6e\u304c\u6c42\u3081\u3089\u308c\u308b\u3002.<\/p>\n

The JCR3HM RCCB<\/strong> table lists 2P\/4P, Type A or AC, 30\/100\/300 mA options and current choices from 25 to 100 A. It lists 230\/240 V for 2P and 400\/415 V for 4P. It does not establish an 800 V LSIG MCCB rating.<\/p>\n

What JCR3HM does<\/h2>\n

It detects residual current within the selected waveform and sensitivity scope. An RCCB under IEC 61008-1 has no integral overcurrent protection<\/strong>. Its current-carrying rating must therefore be coordinated with the circuit’s MCB or fuse and the manufacturer’s fault-protection arrangement.<\/p>\n

Choose waveform type from the connected load and sensitivity from the protection objective and installation rules. A 300 mA setting cannot simply replace required 30 mA additional protection to avoid trips.<\/p>\n

Review the difference between RCBO\u304a\u3088\u3073RCCB\u306e\u4fdd\u8b77<\/a> before allocating overload and residual-current functions.<\/p>\n

What an LSIG MCCB does<\/h2>\n

An LSIG MCCB<\/strong> provides declared long-time, short-time, instantaneous and ground-fault functions. Its ground-fault function is not automatically equivalent to the high-sensitivity residual-current function required on a final circuit. Voltage, fault duty and sensing arrangements must come from its own exact model table.<\/p>\n\n\n\n\n\n\n\n\n
\u30d5\u30a3\u30fc\u30eb\u30c9<\/th>\nJCR3HM listing<\/th>\nElectronic LSIG MCCB<\/th>\n<\/tr>\n<\/thead>\n
\u88fd\u54c1\u30ab\u30c6\u30b4\u30ea\u30fc<\/td>\nRCCB<\/td>\nMCCB with specified electronic release<\/td>\n<\/tr>\n
\u904e\u96fb\u6d41\u4fdd\u8b77<\/td>\nSeparate coordinated device required<\/td>\nDeclared L\/S\/I functions<\/td>\n<\/tr>\n
Leakage or earth-fault function<\/td>\nSelected residual-current type and sensitivity<\/td>\nGround-fault function within release scope<\/td>\n<\/tr>\n
Voltage<\/td>\nListed 2P and 4P values<\/td>\nExact MCCB rating table required<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u30ac\u30a4\u30c9\u3078\u306e \u6b8b\u7559\u96fb\u6d41\u4fdd\u8b77<\/a> describes the installation conditions that a device label alone cannot establish.<\/p>\n

\"800v<\/p>\n

Keep the two specifications separate<\/h2>\n

For JCR3HM, request poles, current, Type A or AC, residual-current sensitivity<\/strong> and coordination evidence. For an 800 V MCCB requirement, request a different exact product code with explicit AC or DC operating voltage and fault ratings. Neither product’s name supplies the other’s functions.<\/p>\n\n\n\n\n\n\n\n
Order<\/th>\nEssential evidence<\/th>\n<\/tr>\n<\/thead>\n
JCR3HM RCCB<\/td>\nRCCB datasheet, wiring and overcurrent coordination<\/td>\n<\/tr>\n
800 V MCCB<\/td>\nExact voltage and fault-duty table, trip curves and connections<\/td>\n<\/tr>\n
Complete panel<\/td>\nAssembly verification and installation design<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Installation and procurement checks<\/h2>\n

Neutral routing, earthing and test procedures remain important for the RCCB. Use the declared test method and a suitable residual-current tester. IEC 61008-1 and IEC 60947-2 have different product scopes; listing both does not combine two device categories.<\/p>\n

Ask W9 Group to confirm the exact required product before quotation. Keep the RCCB and MCCB schedules separate so a misleading legacy title cannot become a purchasing instruction.<\/p>\n

\n

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

Is JCR3HM an 800 V LSIG MCCB?<\/h3>\n

No. The reviewed current listing identifies an RCCB with separate overcurrent protection required. It does not establish that combined description.<\/p>\n

Does JCR3HM provide overload protection by itself?<\/h3>\n

No. Its RCCB function requires a coordinated MCB or fuse for overload and short-circuit protection.<\/p>\n

Is an MCCB ground-fault function the same as a 30 mA RCD?<\/h3>\n

Not automatically. Sensitivity, waveform response, sensing and intended protection differ. Verify the exact functions required by the installation.<\/p>\n

How should an 800 V requirement be quoted?<\/h3>\n

Specify a separate exact MCCB with the required AC or DC voltage, fault duty, poles and trip functions. Do not infer it from the JCR3HM name.<\/p>\n<\/section>\n

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