{"id":16685,"date":"2025-05-19T23:09:46","date_gmt":"2025-05-19T15:09:46","guid":{"rendered":"https:\/\/viox.com\/?p=16685"},"modified":"2026-01-19T11:25:18","modified_gmt":"2026-01-19T03:25:18","slug":"how-to-select-an-mccb-for-a-panel","status":"publish","type":"post","link":"https:\/\/test.viox.com\/cs\/how-to-select-an-mccb-for-a-panel\/","title":{"rendered":"Jak vybrat MCCB pro rozv\u00e1d\u011b\u010d: Jak na jisti\u010de s lisovanou sk\u0159\u00edn\u00ed?"},"content":{"rendered":"<div class=\"product-intro\">\n<p>V\u00fdb\u011br spr\u00e1vn\u00e9ho <a href=\"https:\/\/test.viox.com\/cs\/mccb\/\"><strong>Jisti\u010d s lisovan\u00fdm pouzdrem (MCCB)<\/strong><\/a> je kritick\u00e9 in\u017een\u00fdrsk\u00e9 rozhodnut\u00ed, kter\u00e9 p\u0159\u00edmo ovliv\u0148uje bezpe\u010dnost, spolehlivost a shodu va\u0161eho elektrick\u00e9ho rozvodn\u00e9ho syst\u00e9mu. Na rozd\u00edl od standardn\u00edch jisti\u010d\u016f pro dom\u00e1cnosti jsou MCCB navr\u017eeny pro pr\u016fmyslov\u00e9 a komer\u010dn\u00ed aplikace s vysok\u00fdm v\u00fdkonem a nab\u00edzej\u00ed nastaviteln\u00e9 ochrann\u00e9 parametry a vysok\u00e9 vyp\u00ednac\u00ed schopnosti v souladu s <strong>IEC 60947-2<\/strong>.<\/p>\n<p>Nespr\u00e1vn\u011b zvolen\u00fd MCCB m\u016f\u017ee v\u00e9st k ne\u017e\u00e1douc\u00edmu vyp\u00edn\u00e1n\u00ed, po\u0161kozen\u00ed za\u0159\u00edzen\u00ed nebo katastrof\u00e1ln\u00edmu selh\u00e1n\u00ed b\u011bhem zkratu. Tento komplexn\u00ed pr\u016fvodce v\u00e1s provede technick\u00fdm procesem v\u00fdb\u011bru, od v\u00fdpo\u010dtu zkratov\u00fdch proud\u016f a\u017e po ov\u011b\u0159en\u00ed selektivity, a zajist\u00ed, \u017ee si vyberete ide\u00e1ln\u00ed MCCB pro v\u00e1\u0161 rozvad\u011b\u010d.<\/p>\n<h2>Co je MCCB a pro\u010d jej pou\u017e\u00edvat?<\/h2>\n<p>A <a href=\"https:\/\/test.viox.com\/cs\/what-is-a-molded-case-circuit-breaker-mccb\/\">Jisti\u010d s lisovan\u00fdm pouzdrem (MCCB)<\/a> je pr\u016fmyslov\u00e9 elektrick\u00e9 ochrann\u00e9 za\u0159\u00edzen\u00ed, kter\u00e9 chr\u00e1n\u00ed obvody p\u0159ed p\u0159et\u00ed\u017een\u00edm a zkraty. Je definov\u00e1n sv\u00fdm lisovan\u00fdm izola\u010dn\u00edm pouzdrem, kter\u00e9 obsahuje sp\u00ednac\u00ed mechanismus, zh\u00e1\u0161ec\u00ed komoru oblouku a vyp\u00ednac\u00ed jednotku.<\/p>\n<p>Zat\u00edmco <a href=\"https:\/\/test.viox.com\/cs\/mcb\/\">Miniaturn\u00ed jisti\u010de (MCB)<\/a> jsou vhodn\u00e9 pro koncov\u00e9 distribu\u010dn\u00ed obvody, MCCB jsou standardem pro nap\u00e1jec\u00ed veden\u00ed rozvodu energie d\u00edky sv\u00fdm vy\u0161\u0161\u00edm jmenovit\u00fdm proud\u016fm a nastaviteln\u00fdm charakteristik\u00e1m.<\/p>\n<h3>Srovn\u00e1n\u00ed: MCCB vs. MCB<\/h3>\n<table style=\"border-collapse: collapse; width: 100%; border: 1px solid #ddd; text-align: left;\" border=\"1\" cellspacing=\"0\" cellpadding=\"8\">\n<thead>\n<tr style=\"background-color: #f2f2f2;\">\n<th>Funkce<\/th>\n<th>Miniaturn\u00ed jisti\u010d (MCB)<\/th>\n<th>Jisti\u010d s lisovan\u00fdm pouzdrem (MCCB)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Jmenovit\u00fd proud (In)<\/strong><\/td>\n<td>Typicky 0,5A \u2013 125A<\/td>\n<td>Typicky 16A \u2013 2500A<\/td>\n<\/tr>\n<tr>\n<td><strong>Vyp\u00ednac\u00ed schopnost (Icu)<\/strong><\/td>\n<td>N\u00edzk\u00e1 (4,5kA \u2013 15kA)<\/td>\n<td>Vysok\u00e1 (16kA \u2013 200kA)<\/td>\n<\/tr>\n<tr>\n<td><strong>Charakteristika cesty<\/strong><\/td>\n<td>Pevn\u00e9 (charakteristiky B, C, D)<\/td>\n<td>Nastaviteln\u00e9 (nastaven\u00ed L, S, I, G)<\/td>\n<\/tr>\n<tr>\n<td><strong>Standardn\u00ed<\/strong><\/td>\n<td>IEC 60898-1 (Dom\u00e1cnosti)<\/td>\n<td>IEC 60947-2 (Pr\u016fmysl)<\/td>\n<\/tr>\n<tr>\n<td><strong>Operace<\/strong><\/td>\n<td>Pouze termomagnetick\u00e9<\/td>\n<td>Termomagnetick\u00e9 nebo elektronick\u00e9 (mikroprocesorov\u00e9)<\/td>\n<\/tr>\n<tr>\n<td><strong>D\u00e1lkov\u00e9 ovl\u00e1d\u00e1n\u00ed<\/strong><\/td>\n<td>Omezen\u00e9 p\u0159\u00edslu\u0161enstv\u00ed<\/td>\n<td>Kompletn\u00ed \u0159ada (vyp\u00ednac\u00ed spou\u0161\u0165, podp\u011b\u0165ov\u00e1 spou\u0161\u0165, motorov\u00fd pohon)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<figure style=\"text-align: center; margin: 20px 0;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/ndustrial-electrical-panel-with-multiple-VIOX-MCCBs-showing-different-frame-sizes-and-rating-labels-during-installation.webp\" alt=\"Industrial electrical panel with multiple VIOX MCCBs showing different frame sizes and rating labels during installation\" \/><figcaption style=\"font-style: italic; color: #555; margin-top: 8px;\">Instalace pr\u016fmyslov\u00e9ho elektrick\u00e9ho rozvad\u011b\u010de s MCCB VIOX r\u016fzn\u00fdch velikost\u00ed na DIN li\u0161t\u00e1ch.<\/figcaption><\/figure>\n<h2>Kl\u00ed\u010dov\u00e9 faktory p\u0159i v\u00fdb\u011bru MCCB<\/h2>\n<h3>1. Jmenovit\u00fd proud (In) a velikost r\u00e1mu (Inm)<\/h3>\n<p>Na str\u00e1nk\u00e1ch <strong>Velikost r\u00e1me\u010dku (Inm)<\/strong> ur\u010duje fyzick\u00e9 rozm\u011bry a maxim\u00e1ln\u00ed proud, kter\u00fd m\u016f\u017ee pouzdro jisti\u010de zvl\u00e1dnout (nap\u0159. r\u00e1m 250A). <strong>Jmenovit\u00fd proud (In)<\/strong> je skute\u010dn\u00e1 hodnota proudu, na kterou je jisti\u010d nastaven (nap\u0159. vyp\u00ednac\u00ed jednotka 160A v r\u00e1mu 250A).<\/p>\n<ul>\n<li><strong>Pravidlo v\u00fdb\u011bru:<\/strong> $I_b \\le I_n \\le I_z$\n<ul>\n<li>$I_b$: N\u00e1vrhov\u00fd proud obvodu.<\/li>\n<li>$I_n$: Jmenovit\u00fd proud MCCB.<\/li>\n<li>$I_z$: Proudov\u00e1 zat\u00ed\u017eitelnost kabelu.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>2. Vyp\u00ednac\u00ed schopnost (Icu vs. Ics)<\/h3>\n<p>Vyp\u00ednac\u00ed schopnost je maxim\u00e1ln\u00ed zkratov\u00fd proud, kter\u00fd m\u016f\u017ee MCCB bezpe\u010dn\u011b p\u0159eru\u0161it. Podle <strong>IEC 60947-2<\/strong>, existuj\u00ed dv\u011b kritick\u00e9 hodnoty:<\/p>\n<ul>\n<li><strong>Icu (Mezn\u00ed vyp\u00ednac\u00ed schopnost):<\/strong> Maxim\u00e1ln\u00ed proud, kter\u00fd m\u016f\u017ee jisti\u010d jednou p\u0159eru\u0161it. Pot\u00e9 ji\u017e nemus\u00ed b\u00fdt pou\u017eiteln\u00fd.<\/li>\n<li><strong>Ics (Provozn\u00ed vyp\u00ednac\u00ed schopnost):<\/strong> Proud, kter\u00fd m\u016f\u017ee jisti\u010d opakovan\u011b p\u0159eru\u0161it a p\u0159esto z\u016fstat funk\u010dn\u00ed.<\/li>\n<\/ul>\n<p>Pro kritick\u00e9 aplikace (nemocnice, datov\u00e1 centra) zajist\u011bte <strong>Ics = 100% Icu<\/strong>. Pro standardn\u00ed aplikace je \u010dasto p\u0159ijateln\u00e9 Ics = 50% nebo 75% Icu. Zjist\u011bte v\u00edce o <a href=\"https:\/\/test.viox.com\/cs\/circuit-breaker-ratings-icu-ics-icw-icm\/\">Hodnoty Icu vs Ics<\/a>.<\/p>\n<p><strong>Matice v\u00fdb\u011bru vyp\u00ednac\u00ed schopnosti:<\/strong><\/p>\n<table style=\"border-collapse: collapse; width: 100%; border: 1px solid #ddd; text-align: left;\" border=\"1\" cellspacing=\"0\" cellpadding=\"8\">\n<thead>\n<tr style=\"background-color: #f2f2f2;\">\n<th>Aplika\u010dn\u00ed sc\u00e9n\u00e1\u0159<\/th>\n<th>P\u0159edpokl\u00e1dan\u00fd zkratov\u00fd proud (PSCC)<\/th>\n<th>Doporu\u010den\u00e1 vyp\u00ednac\u00ed schopnost MCCB<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Reziden\u010dn\u00ed \/ Lehk\u00e9 komer\u010dn\u00ed provozy<\/strong><\/td>\n<td>&lt; 10 kA<\/td>\n<td>16 kA nebo 25 kA<\/td>\n<\/tr>\n<tr>\n<td><strong>Hlavn\u00ed rozvad\u011b\u010d komer\u010dn\u00ed budovy<\/strong><\/td>\n<td>15 kA \u2013 35 kA<\/td>\n<td>36 kA nebo 50 kA<\/td>\n<\/tr>\n<tr>\n<td><strong>Pr\u016fmyslov\u00fd hlavn\u00ed rozvad\u011b\u010d<\/strong><\/td>\n<td>35 kA \u2013 65 kA<\/td>\n<td>70 kA nebo 85 kA<\/td>\n<\/tr>\n<tr>\n<td><strong>T\u011b\u017ek\u00fd pr\u016fmysl \/ V\u00fdstup transform\u00e1toru<\/strong><\/td>\n<td>&gt; 70 kA<\/td>\n<td>100 kA nebo 150 kA<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<figure style=\"text-align: center; margin: 20px 0;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/Close-up-of-VIOX-MCCB-nameplate-showing-rated-current-breaking-capacity-and-IEC-60947-2-certification-specifications.webp\" alt=\"Close-up of VIOX MCCB nameplate showing rated current, breaking capacity and IEC 60947-2 certification specifications\" \/><figcaption style=\"font-style: italic; color: #555; margin-top: 8px;\">Detail \u0161t\u00edtku MCCB VIOX zobrazuj\u00edc\u00ed jmenovit\u00fd proud (In), vyp\u00ednac\u00ed schopnost (Icu) a specifikace IEC 60947-2.<\/figcaption><\/figure>\n<h3>3. Jmenovit\u00e9 nap\u011bt\u00ed<\/h3>\n<p>Ujist\u011bte se, \u017ee MCCB spl\u0148uje po\u017eadavky na nap\u011bt\u00ed va\u0161eho syst\u00e9mu. Prohl\u00e9dn\u011bte si na\u0161eho <a href=\"https:\/\/test.viox.com\/cs\/ue-vs-ui-vs-uimp-voltage-ratings-guide\/\">Pr\u016fvodce Ue vs Ui vs Uimp<\/a> pro hlubok\u00e9 technick\u00e9 definice.<\/p>\n<ul>\n<li><strong>Ue (Jmenovit\u00e9 provozn\u00ed nap\u011bt\u00ed):<\/strong> Typicky 400V\/415V nebo 690V.<\/li>\n<li><strong>Ui (Jmenovit\u00e9 izola\u010dn\u00ed nap\u011bt\u00ed):<\/strong> Mus\u00ed b\u00fdt $\\ge$ Ue (typicky 800V nebo 1000V).<\/li>\n<li><strong>Uimp (Impulzn\u00ed v\u00fddr\u017en\u00e9 nap\u011bt\u00ed):<\/strong> Odolnost proti nap\u011b\u0165ov\u00fdm \u0161pi\u010dk\u00e1m (typicky 8kV).<\/li>\n<\/ul>\n<h3>4. Technologie vyp\u00ednac\u00ed jednotky<\/h3>\n<p>Vyp\u00ednac\u00ed jednotka je \u201cmozek\u201d MCCB.<\/p>\n<table style=\"border-collapse: collapse; width: 100%; border: 1px solid #ddd; text-align: left;\" border=\"1\" cellspacing=\"0\" cellpadding=\"8\">\n<thead>\n<tr style=\"background-color: #f2f2f2;\">\n<th>Funkce<\/th>\n<th>Termomagnetick\u00e9 (TM)<\/th>\n<th>Elektronick\u00e9 (mikroprocesorov\u00e9)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Mechanismus ochrany<\/strong><\/td>\n<td>Bimetal (p\u0159et\u00ed\u017een\u00ed) + C\u00edvka (zkrat)<\/td>\n<td>Proudov\u00e9 transform\u00e1tory + CPU<\/td>\n<\/tr>\n<tr>\n<td><strong>P\u0159esnost<\/strong><\/td>\n<td>St\u0159edn\u00ed (ovlivn\u011bno okoln\u00ed teplotou)<\/td>\n<td>Vysok\u00e1 (nez\u00e1visl\u00e1 na teplot\u011b)<\/td>\n<\/tr>\n<tr>\n<td><strong>Nastavitelnost<\/strong><\/td>\n<td>Omezen\u00fd (0,7 \u2013 1,0 x In)<\/td>\n<td>\u0160irok\u00fd rozsah (0,4 \u2013 1,0 x In) + \u010casov\u00e9 zpo\u017ed\u011bn\u00ed<\/td>\n<\/tr>\n<tr>\n<td><strong>Funkce<\/strong><\/td>\n<td>LI (Dlouhodob\u00e9, Okam\u017eit\u00e9)<\/td>\n<td>LSI nebo LSIG (Zemn\u00ed spojen\u00ed)<\/td>\n<\/tr>\n<tr>\n<td><strong>N\u00e1klady<\/strong><\/td>\n<td>Spodn\u00ed<\/td>\n<td>Vy\u0161\u0161\u00ed<\/td>\n<\/tr>\n<tr>\n<td><strong>Nejlep\u0161\u00ed pro<\/strong><\/td>\n<td>Standardn\u00ed nap\u00e1je\u010de, jednoduch\u00e9 z\u00e1t\u011b\u017ee<\/td>\n<td>Gener\u00e1tory, komplexn\u00ed koordinace, motory<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<figure style=\"text-align: center; margin: 20px 0;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/Technical-cutaway-diagram-of-MCCB-internal-components-including-thermal-trip-magnetic-trip-arc-chute-and-contact-mechanism.webp\" alt=\"Technical cutaway diagram of MCCB internal components including thermal trip, magnetic trip, arc chute and contact mechanism\" \/><figcaption style=\"font-style: italic; color: #555; margin-top: 8px;\">Vnit\u0159n\u00ed pr\u016f\u0159ez MCCB zobrazuj\u00edc\u00ed termomagnetickou spou\u0161\u0165, zh\u00e1\u0161ec\u00ed komoru a kontaktn\u00ed mechanismus.<\/figcaption><\/figure>\n<h2>Pr\u016fvodce v\u00fdb\u011brem krok za krokem<\/h2>\n<p>Pro spr\u00e1vnou specifikaci MCCB postupujte podle tohoto in\u017een\u00fdrsk\u00e9ho postupu.<\/p>\n<figure style=\"text-align: center; margin: 20px 0;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/MCCB-selection-process-flowchart-showing-step-by-step-decision-points-from-load-calculation-to-final-specification.webp\" alt=\"MCCB selection process flowchart showing step-by-step decision points from load calculation to final specification\" \/><figcaption style=\"font-style: italic; color: #555; margin-top: 8px;\">V\u00fdvojov\u00fd diagram procesu v\u00fdb\u011bru MCCB krok za krokem: Od v\u00fdpo\u010dtu z\u00e1t\u011b\u017ee po kone\u010dnou specifikaci.<\/figcaption><\/figure>\n<h3>Krok 1: V\u00fdpo\u010det proudu z\u00e1t\u011b\u017ee (Ib)<\/h3>\n<p>Ur\u010dete proud p\u0159i pln\u00e9m zat\u00ed\u017een\u00ed obvodu.<\/p>\n<ul>\n<li><em>Vzorec (3-f\u00e1zov\u00fd):<\/em> $I = P \/ (\\sqrt{3} \\times V \\times PF)$<\/li>\n<li>Pou\u017eijte bezpe\u010dnostn\u00ed rezervu (obvykle 125% pro trval\u00e9 zat\u00ed\u017een\u00ed podle doporu\u010den\u00ed NEC\/IEC).<\/li>\n<\/ul>\n<h3>Krok 2: Ur\u010den\u00ed p\u0159edpokl\u00e1dan\u00e9ho zkratov\u00e9ho proudu (PSCC)<\/h3>\n<p>Vypo\u010d\u00edtejte poruchov\u00fd proud v m\u00edst\u011b instalace. MCCB <strong>Icu<\/strong> mus\u00ed b\u00fdt v\u011bt\u0161\u00ed ne\u017e tato hodnota.<\/p>\n<ul>\n<li><em>Pozn\u00e1mka:<\/em> Pokud je PSCC 45kA, nevyb\u00edrejte jisti\u010d 36kA. Vyberte model 50kA nebo 70kA.<\/li>\n<\/ul>\n<h3>Krok 3: V\u00fdb\u011br velikosti r\u00e1mu a jmenovit\u00e9 hodnoty spou\u0161t\u011b<\/h3>\n<p>Vyberte velikost r\u00e1mu, kter\u00e1 vyhovuje va\u0161emu po\u017eadovan\u00e9mu proudu a nab\u00edz\u00ed pot\u0159ebnou vyp\u00ednac\u00ed schopnost.<\/p>\n<figure style=\"text-align: center; margin: 20px 0;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/Comparative-technical-illustration-of-three-MCCB-frame-sizes-showing-dimensional-specifications-and-terminal-configurations.webp\" alt=\"Comparative technical illustration of three MCCB frame sizes showing dimensional specifications and terminal configurations\" \/><figcaption style=\"font-style: italic; color: #555; margin-top: 8px;\">Porovn\u00e1n\u00ed velikost\u00ed r\u00e1m\u016f MCCB (100A, 250A, 630A) zobrazuj\u00edc\u00ed rozm\u011bry a konfigurace svorek.<\/figcaption><\/figure>\n<h3>Krok 4: Pou\u017eit\u00ed reduk\u010dn\u00edch faktor\u016f<\/h3>\n<p>MCCB jsou kalibrov\u00e1ny typicky p\u0159i 40 \u00b0C. Pokud jsou instalov\u00e1ny v hork\u00fdch panelech nebo ve vysok\u00fdch nadmo\u0159sk\u00fdch v\u00fd\u0161k\u00e1ch, mus\u00edte sn\u00ed\u017eit kapacitu. Viz n\u00e1\u0161 <a href=\"https:\/\/test.viox.com\/cs\/electrical-derating-temperature-altitude-grouping-factors\/\">Pr\u016fvodce elektrick\u00fdm sn\u00ed\u017een\u00edm v\u00fdkonu<\/a>.<\/p>\n<p><strong>Tabulka sn\u00ed\u017een\u00ed v\u00fdkonu v z\u00e1vislosti na teplot\u011b (P\u0159\u00edklad pro termomagnetick\u00fd MCCB):<\/strong><\/p>\n<table style=\"border-collapse: collapse; width: 100%; border: 1px solid #ddd; text-align: center;\" border=\"1\" cellspacing=\"0\" cellpadding=\"8\">\n<thead>\n<tr style=\"background-color: #f2f2f2;\">\n<th style=\"text-align: left;\">Okoln\u00ed teplota (\u00b0C)<\/th>\n<th>30\u00b0C<\/th>\n<th>40 \u00b0C (Ref)<\/th>\n<th>50\u00b0C<\/th>\n<th>60\u00b0C<\/th>\n<th>70 \u00b0C<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align: left;\"><strong>Korek\u010dn\u00ed faktor<\/strong><\/td>\n<td>1.10<\/td>\n<td>1.00<\/td>\n<td>0.90<\/td>\n<td>0.80<\/td>\n<td>0.70<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Krok 5: Ov\u011b\u0159en\u00ed koordinace (selektivity)<\/h3>\n<p>Zajist\u011bte, aby porucha po proudu vybavila <em>pouze<\/em> jisti\u010d po proudu, nikoli hlavn\u00ed MCCB.<\/p>\n<ul>\n<li><strong>Proudov\u00e1 selektivita:<\/strong> Prahov\u00e1 hodnota spou\u0161t\u011bn\u00ed MCCB proti proudu &gt; Prahov\u00e1 hodnota spou\u0161t\u011bn\u00ed jisti\u010de po proudu.<\/li>\n<li><strong>\u010casov\u00e1 selektivita:<\/strong> Pou\u017eijte elektronick\u00e9 spou\u0161t\u011bc\u00ed jednotky k p\u0159id\u00e1n\u00ed \u010dasov\u00e9ho zpo\u017ed\u011bn\u00ed (jisti\u010de kategorie B) do MCCB proti proudu.<\/li>\n<li>P\u0159e\u010dt\u011bte si v\u00edce v na\u0161em <a href=\"https:\/\/test.viox.com\/cs\/what-is-breaker-selectivity-coordination-guide\/\">Pr\u016fvodce selektivitou a koordinac\u00ed jisti\u010d\u016f<\/a>.<\/li>\n<\/ul>\n<h2>P\u0159\u00edklad v\u00fdpo\u010dtu dimenzov\u00e1n\u00ed<\/h2>\n<p><strong>Sc\u00e9n\u00e1\u0159:<\/strong> Pot\u0159ebujete chr\u00e1nit 3f\u00e1zov\u00fd nap\u00e1je\u010d pro d\u00edl\u010d\u00ed panel s vypo\u010dten\u00fdm zat\u00ed\u017een\u00edm 180A. Nap\u011bt\u00ed syst\u00e9mu je 415V AC. Vypo\u010dten\u00fd zkratov\u00fd proud na p\u0159\u00edpojnici je 32kA. O\u010dek\u00e1v\u00e1 se, \u017ee vnit\u0159n\u00ed teplota panelu bude 50 \u00b0C.<\/p>\n<ol>\n<li><strong>Po\u017eadavek na zat\u00ed\u017een\u00ed:<\/strong> $I_b = 180A$.<\/li>\n<li><strong>Kontrola sn\u00ed\u017een\u00ed v\u00fdkonu:<\/strong> P\u0159i 50 \u00b0C je reduk\u010dn\u00ed faktor 0,9.\n<ul>\n<li>Po\u017eadovan\u00fd jmenovit\u00fd proud = $180A \/ 0,9 = 200A$.<\/li>\n<\/ul>\n<\/li>\n<li><strong>V\u00fdb\u011br r\u00e1mu:<\/strong> Vyberte <strong>R\u00e1m 250A<\/strong> MCCB (dal\u0161\u00ed standardn\u00ed velikost od 200A).<\/li>\n<li><strong>Nastaven\u00ed spou\u0161t\u011bc\u00ed jednotky:<\/strong> Vyberte spou\u0161t\u011bc\u00ed jednotku 250A nebo nastavitelnou elektronickou spou\u0161t\u011bc\u00ed jednotku 250A nastavenou na 0,8 x In ($250 \\times 0,8 = 200A$).<\/li>\n<li><strong>P\u0159eru\u0161ovac\u00ed kapacita:<\/strong> $PSCC = 32kA$.\n<ul>\n<li>Vyberte MCCB s <strong>Icu = 36kA<\/strong> nebo <strong>50 kA<\/strong> (Standardn\u00ed 25kA je nedostate\u010dn\u00e9).<\/li>\n<\/ul>\n<\/li>\n<li><strong>Kone\u010dn\u00fd v\u00fdb\u011br:<\/strong> VIOX VMM3-250H (Vysok\u00e1 vyp\u00ednac\u00ed schopnost), 3-p\u00f3lov\u00fd, 250A, Elektronick\u00e1 spou\u0161t\u011bc\u00ed jednotka.<\/li>\n<\/ol>\n<h2>B\u011b\u017en\u00e9 odstra\u0148ov\u00e1n\u00ed probl\u00e9m\u016f a chyby<\/h2>\n<ul>\n<li><strong>Ne\u017e\u00e1douc\u00ed vypnut\u00ed:<\/strong> \u010casto zp\u016fsobeno nastaven\u00edm magnetick\u00e9 spou\u0161t\u011b (Im) p\u0159\u00edli\u0161 n\u00edzko pro z\u00e1b\u011brov\u00e9 proudy motoru. P\u0159epn\u011bte na obecnou k\u0159ivku ochrany motoru nebo upravte okam\u017eit\u00e9 nastaven\u00ed.<\/li>\n<li><strong>P\u0159eh\u0159\u00e1t\u00ed:<\/strong> Zkontrolujte utahovac\u00ed moment svorek. Uvoln\u011bn\u00e9 spoje jsou nej\u010dast\u011bj\u0161\u00ed p\u0159\u00ed\u010dinou selh\u00e1n\u00ed MCCB.<\/li>\n<li><strong>Jisti\u010d nelze resetovat:<\/strong> Mechanismus m\u016f\u017ee b\u00fdt v poloze \u201cVypnuto\u201d (uprost\u0159ed). P\u0159ed p\u0159epnut\u00edm do polohy \u201cZapnuto\u201d mus\u00edte p\u00e1ku pevn\u011b p\u0159epnout do polohy \u201cVypnuto\u201d (reset).<\/li>\n<li><strong>Bzu\u010div\u00fd zvuk:<\/strong> M\u00edrn\u00e9 hu\u010den\u00ed je u velk\u00fdch proud\u016f norm\u00e1ln\u00ed, ale hlasit\u00e9 bzu\u010den\u00ed m\u016f\u017ee znamenat uvoln\u011bn\u00e9 plechy nebo kontakty. Viz na\u0161e <a href=\"https:\/\/test.viox.com\/cs\/why-is-my-circuit-breaker-making-a-buzzing-sound-an-engineering-diagnostic-guide\/\">Diagnostick\u00e1 p\u0159\u00edru\u010dka pro bzu\u010d\u00edc\u00ed jisti\u010de<\/a>.<\/li>\n<\/ul>\n<h2>\u010cASTO KLADEN\u00c9 DOTAZY<\/h2>\n<p><strong>Ot\u00e1zka: Mohu pou\u017e\u00edt st\u0159\u00eddav\u00fd MCCB pro stejnosm\u011brn\u00e9 aplikace?<\/strong><br \/>\nOdpov\u011b\u010f: Obecn\u011b ne. Stejnosm\u011brn\u00e9 oblouky se h\u016f\u0159e zh\u00e1\u0161ej\u00ed. Mus\u00edte pou\u017e\u00edt MCCB speci\u00e1ln\u011b ur\u010den\u00fd pro stejnosm\u011brn\u00fd proud nebo ov\u011b\u0159it stejnosm\u011brn\u00e9 jmenovit\u00e9 hodnoty v\u00fdrobce pro dan\u00fd model. Viz <a href=\"https:\/\/test.viox.com\/cs\/dc-vs-ac-circuit-breakers-essential-differences-for-electrical-safety\/\">Stejnosm\u011brn\u00e9 vs. st\u0159\u00eddav\u00e9 jisti\u010de<\/a>.<\/p>\n<p><strong>Ot\u00e1zka: Jak\u00fd je rozd\u00edl mezi 3P a 4P MCCB?<\/strong><br \/>\nOdpov\u011b\u010f: 3P chr\u00e1n\u00ed t\u0159i f\u00e1ze (L1, L2, L3). 4P zahrnuje ochranu nulov\u00e9ho vodi\u010de, kter\u00e1 je nezbytn\u00e1, pokud je nulov\u00fd vodi\u010d distribuov\u00e1n a o\u010dek\u00e1vaj\u00ed se vysok\u00e9 harmonick\u00e9 proudy.<\/p>\n<p><strong>Ot\u00e1zka: Jak otestuji MCCB?<\/strong><br \/>\nOdpov\u011b\u010f: Tla\u010d\u00edtko \u201cTest\u201d kontroluje pouze mechanick\u00fd vyp\u00ednac\u00ed mechanismus. Pro ov\u011b\u0159en\u00ed elektronick\u00e9\/tepeln\u00e9 p\u0159esnosti pot\u0159ebujete sekund\u00e1rn\u00ed injek\u010dn\u00ed testov\u00e1n\u00ed. \u010c\u00edst <a href=\"https:\/\/test.viox.com\/cs\/how-to-really-test-mccb-test-button-lie\/\">Jak skute\u010dn\u011b otestovat MCCB<\/a>.<\/p>\n<p><strong>Ot\u00e1zka: M\u00e1m pou\u017e\u00edt MCCB nebo ICCB?<\/strong><br \/>\nOdpov\u011b\u010f: ICCB (jisti\u010de s izolovan\u00fdm pouzdrem) se obvykle pou\u017e\u00edvaj\u00ed pro vy\u0161\u0161\u00ed proudy (a\u017e 4000 A) a nab\u00edzej\u00ed vy\u0161\u0161\u00ed jmenovit\u00e9 hodnoty kr\u00e1tkodob\u00e9 odolnosti (Icw) ne\u017e standardn\u00ed MCCB. Viz na\u0161e <a href=\"https:\/\/test.viox.com\/cs\/mccb-vs-iccb-comprehensive-guide\/\">Pr\u016fvodce MCCB vs. ICCB<\/a>.<\/p>\n<p><strong>Ot\u00e1zka: Jak \u010dasto by se m\u011bla prov\u00e1d\u011bt \u00fadr\u017eba jisti\u010d\u016f?<\/strong><br \/>\nOdpov\u011b\u010f: Zat\u00edmco MCCB jsou ve srovn\u00e1n\u00ed s ACB \u201cbez\u00fadr\u017ebov\u00e9\u201d, m\u011bly by b\u00fdt vizu\u00e1ln\u011b kontrolov\u00e1ny ka\u017ed\u00fd rok a m\u011bly by b\u00fdt prov\u00e1d\u011bny termografick\u00e9 skeny pro detekci uvoln\u011bn\u00fdch spoj\u016f.<\/p>\n<h2>Kl\u00ed\u010dov\u00e9 poznatky<\/h2>\n<ul>\n<li><strong>Bezpe\u010dnost p\u0159edev\u0161\u00edm:<\/strong> V\u017edy vyberte MCCB s <strong>Icu<\/strong> jmenovitou hodnotou vy\u0161\u0161\u00ed, ne\u017e je potenci\u00e1ln\u00ed poruchov\u00fd proud (PSCC) v m\u00edst\u011b instalace.<\/li>\n<li><strong>Zaji\u0161t\u011bn\u00ed do budoucna:<\/strong> Pro kritick\u00e9 panely zvolte nastaviteln\u00e9 elektronick\u00e9 vyp\u00ednac\u00ed jednotky, kter\u00e9 umo\u017en\u00ed budouc\u00ed zm\u011bny zat\u00ed\u017een\u00ed a lep\u0161\u00ed koordinaci.<\/li>\n<li><strong>Na prost\u0159ed\u00ed z\u00e1le\u017e\u00ed:<\/strong> Neignorujte teplotn\u00ed a nadmo\u0159sk\u00e9 reduk\u010dn\u00ed faktory, jinak m\u016f\u017ee jisti\u010d p\u0159ed\u010dasn\u011b vypnout.<\/li>\n<li><strong>Koordinace:<\/strong> Zajist\u011bte, aby v\u00e1\u0161 hlavn\u00ed MCCB zpozdil vypnut\u00ed dostate\u010dn\u011b dlouho, aby pod\u0159azen\u00e9 MCB odstranily men\u0161\u00ed poruchy (Selektivita).<\/li>\n<\/ul>\n<p>V\u00fdb\u011br spr\u00e1vn\u00e9ho MCCB je rovnov\u00e1ha mezi bezpe\u010dnost\u00ed, funk\u010dnost\u00ed a cenou. Dodr\u017eov\u00e1n\u00edm tohoto pr\u016fvodce a dodr\u017eov\u00e1n\u00edm <strong>IEC 60947-2<\/strong> norem zajist\u00edte robustn\u00ed elektrickou infrastrukturu, kter\u00e1 chr\u00e1n\u00ed person\u00e1l i za\u0159\u00edzen\u00ed.<\/p>\n<\/div>\n<div class=\"simg-pop-btn\" style=\"top: 2247.55px; left: 14px; display: none;\"><\/div>\n<div class=\"simg-pop-btn\" style=\"top: 2247.55px; left: 14px; display: none;\"><\/div>","protected":false},"excerpt":{"rendered":"<p>Selecting the right Molded Case Circuit Breaker (MCCB) is a critical engineering decision that directly impacts the safety, reliability, and compliance of your electrical distribution system. Unlike standard residential breakers, MCCBs are designed for high-power industrial and commercial applications, offering adjustable protection settings and high breaking capacities in accordance with IEC 60947-2. An incorrectly selected [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":16692,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-16685","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"_links":{"self":[{"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/posts\/16685","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/comments?post=16685"}],"version-history":[{"count":2,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/posts\/16685\/revisions"}],"predecessor-version":[{"id":21362,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/posts\/16685\/revisions\/21362"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/media\/16692"}],"wp:attachment":[{"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/media?parent=16685"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/categories?post=16685"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/tags?post=16685"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}