{"id":1148,"date":"2026-09-20T00:16:24","date_gmt":"2026-09-20T00:16:24","guid":{"rendered":"https:\/\/ritoks.com\/?p=1148"},"modified":"2026-10-04T06:58:18","modified_gmt":"2026-10-04T06:58:18","slug":"mpcb-vs-overload-relay-vs-mcb","status":"publish","type":"post","link":"https:\/\/ritoks.com\/cs\/mpcb-vs-overload-relay-vs-mcb\/","title":{"rendered":"MPCB vs. rel\u00e9 proti tepeln\u00e9mu p\u0159et\u00ed\u017een\u00ed vs. MCB: \u00dalohy a krit\u00e9ria pro v\u00fdb\u011br"},"content":{"rendered":"

V r\u00e1mci stejn\u00e9 diskuse o \u0159\u00edzen\u00ed motor\u016f se mohou objevit pojmy jako MCB, jisti\u010d pro ochranu motoru a tepeln\u00e9 p\u0159et\u00ed\u017eovac\u00ed rel\u00e9, av\u0161ak jejich n\u00e1zvy neznamenaj\u00ed, \u017ee maj\u00ed stejn\u00e9 funkce nebo \u017ee se na n\u011b vztahuj\u00ed zam\u011bniteln\u00e9 pravidla pro v\u00fdb\u011br. Po\u017eadovan\u00e1 sada za\u0159\u00edzen\u00ed z\u00e1vis\u00ed na motoru, pou\u017eit\u00ed, architektu\u0159e \u0159\u00edzen\u00ed a p\u0159esn\u00fdch pokynech v\u00fdrobce.<\/p>\n\n\n\n

Toto srovn\u00e1n\u00ed vysv\u011btluje funk\u010dn\u00ed hranice pro v\u00fdb\u011br dodavatel\u016f. Nejedn\u00e1 se o sch\u00e9ma zapojen\u00ed, koordina\u010dn\u00ed tabulku, pokyny k nastaven\u00ed vyp\u00ednac\u00edch prah\u016f ani o schv\u00e1len\u00ed konkr\u00e9tn\u00ed kombinace komponent\u016f.<\/p>\n\n\n\n

\"Autentick\u00e9
T\u0159i r\u016fzn\u00e9 proveden\u00ed v\u00fdrobku pro srovn\u00e1n\u00ed funkc\u00ed. Toto uspo\u0159\u00e1d\u00e1n\u00ed nep\u0159edstavuje ov\u011b\u0159enou kombinaci, instalaci, zapojen\u00ed ani sch\u00e9ma koordinace.<\/figcaption><\/figure>\n\n\n\n

P\u0159ehled funk\u010dn\u00edch rol\u00ed<\/h2>\n\n\n\n
Za\u0159\u00edzen\u00ed<\/th>\u00daloha podlo\u017een\u00e1 d\u016fkazy<\/th>Co je je\u0161t\u011b t\u0159eba p\u0159esn\u011b ov\u011b\u0159it<\/th><\/tr><\/thead>
MCB<\/td>Obecn\u00e1 proudov\u00e1 ochrana obvodu proti p\u0159et\u00ed\u017een\u00ed a zkratu.<\/td>Vhodnost motoru, chodov\u00e1 k\u0159ivka, brzdn\u00fd v\u00fdkon, nap\u011bt\u00ed a pravidla pro instalaci.<\/td><\/tr>\n
MPCB<\/td>Certifikovan\u00fd jisti\u010d pro elektromotory m\u016f\u017ee kombinovat nastavitelnou ochranu proti p\u0159et\u00ed\u017een\u00ed motoru a magnetickou ochranu proti zkratu.<\/td>\u00dadaje o motoru, nastavovac\u00ed rozsah, nap\u011bt\u00ed, tabulka brzdn\u00fdch v\u00fdkon\u016f, p\u0159\u00edslu\u0161enstv\u00ed a koordinace.<\/td><\/tr>\n
Tepeln\u00e9 p\u0159et\u00ed\u017ekov\u00e9 rel\u00e9<\/td>Ochrana proti p\u0159et\u00ed\u017een\u00ed motoru; citlivost na v\u00fdpadek f\u00e1ze, je-li to uvedeno v dokumentaci.<\/td>T\u0159\u00edda vypnut\u00ed, chov\u00e1n\u00ed p\u0159i resetov\u00e1n\u00ed, p\u0159i\u0159azen\u00ed styka\u010d\u016f, mont\u00e1\u017e a ochrana proti zkratu na vstupu.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\"Funk\u010dn\u00ed
Tyto t\u0159i typy za\u0159\u00edzen\u00ed pln\u00ed r\u016fzn\u00e9 funkce z hlediska d\u016fkazn\u00ed hodnoty. Toto srovn\u00e1n\u00ed nep\u0159edstavuje pokyny k zapojen\u00ed ani schv\u00e1len\u00ed kombinace komponent\u016f.<\/figcaption><\/figure>\n\n\n\n

1. Jak\u00fd p\u0159\u00ednos m\u00e1 MCB<\/h2>\n\n\n\n

Spole\u010dnost ABB popisuje miniaturn\u00ed jisti\u010d jako resetovateln\u00e9 nadproudov\u00e9 ochrann\u00e9 za\u0159\u00edzen\u00ed ur\u010den\u00e9 k ochran\u011b p\u0159ed p\u0159et\u00ed\u017een\u00edm a zkratem v elektrick\u00fdch s\u00edt\u00edch. Tato obecn\u00e1 funkce v\u0161ak neznamen\u00e1, \u017ee jak\u00fdkoli miniaturn\u00ed jisti\u010d je vhodn\u00fd pro konkr\u00e9tn\u00ed odbo\u010dku motoru.<\/p>\n\n\n\n

P\u0159i dimenzov\u00e1n\u00ed motor\u016f je t\u0159eba ov\u011b\u0159it p\u0159esn\u00e9 nap\u011bt\u00ed jisti\u010de, po\u010det p\u00f3l\u016f, charakteristiku vyp\u00edn\u00e1n\u00ed, vyp\u00ednac\u00ed schopnost a p\u0159\u00edslu\u0161n\u00e1 pravidla pro motorov\u00e9 obvody. St\u00e1vaj\u00edc\u00ed p\u0159\u00edru\u010dky k jisti\u010d\u016fm RITOKS zachov\u00e1vaj\u00ed sv\u00e9 vlastn\u00ed k\u0159ivky a z\u00e1m\u011br nab\u00eddkov\u00e9ho \u0159\u00edzen\u00ed; tento \u010dl\u00e1nek tato pravidla pro v\u00fdb\u011br neopakuje.<\/p>\n\n\n\n

2. Jak\u00fd p\u0159\u00ednos m\u00e1 MPCB<\/h2>\n\n\n\n

A jisti\u010d pro ochranu motoru<\/a> se vol\u00ed podle po\u017eadavk\u016f na motorov\u00fd obvod. P\u0159esn\u00e9 funkce st\u00e1le vypl\u00fdvaj\u00ed z produktov\u00e9ho z\u00e1znamu, nikoli pouze z n\u00e1zvu produktov\u00e9 \u0159ady.<\/p>\n\n\n\n

Zve\u0159ejn\u011bn\u00e9 \u0158ada jisti\u010d\u016f pro ochranu motor\u016f GYMP7<\/a> uv\u00e1d\u00ed t\u0159\u00edf\u00e1zovou architekturu, nastavitelnou tepelnou ochranu proti p\u0159et\u00ed\u017een\u00ed a magnetickou ochranu proti zkratu. Zahrnuje p\u0159esn\u00e9 rozsahy nastaven\u00ed pro konkr\u00e9tn\u00ed modely v rozmez\u00ed od 0,1 A do 80 A. \u00dadaje Icu a Ics mus\u00ed odpov\u00eddat vybran\u00e9mu r\u00e1mu, proudov\u00e9mu rozsahu a nap\u011b\u0165ov\u00e9 tabulce.<\/p>\n\n\n\n

Hodnocen\u00ed GYMP7 nelze zobec\u0148ovat na v\u0161echny MPCB. U vybran\u00e9ho za\u0159\u00edzen\u00ed je nutn\u00e9 zkontrolovat p\u0159esn\u00e9 \u00fadaje o motoru, nastaven\u00ed p\u00e1sma, provozn\u00ed nap\u011bt\u00ed, o\u010dek\u00e1vanou \u00farove\u0148 poruchy a pot\u0159ebn\u00e9 p\u0159\u00edslu\u0161enstv\u00ed.<\/p>\n\n\n\n

3. Jak\u00e1 je funkce tepeln\u00e9ho p\u0159et\u00ed\u017eovac\u00edho rel\u00e9<\/h2>\n\n\n\n

Ofici\u00e1ln\u00ed dokumentace v\u00fdrobce popisuje tepeln\u00e9 p\u0159et\u00ed\u017eovac\u00ed rel\u00e9<\/a> jako ochrann\u00e1 za\u0159\u00edzen\u00ed motoru proti p\u0159et\u00ed\u017een\u00ed a v\u00fdpadku f\u00e1ze. Samotn\u00e9 p\u0159et\u00ed\u017ekov\u00e9 rel\u00e9 nezaji\u0161\u0165uje ochranu motorov\u00e9ho odbo\u010dn\u00e9ho obvodu proti zkratu.<\/p>\n\n\n\n

Zve\u0159ejn\u011bn\u00e9 \u0158ada tepeln\u00fdch p\u0159et\u00ed\u017eovac\u00edch rel\u00e9 ZS3RU<\/a> Uv\u00e1d\u00ed rozsahy nastaven\u00ed specifick\u00e9 pro dan\u00fd model v rozmez\u00ed od 0,11 A do 100 A, pou\u017eit\u00ed ve t\u0159\u00edf\u00e1zov\u00fdch asynchr\u00f3nn\u00edch motorech, ochranu proti p\u0159et\u00ed\u017een\u00ed a v\u00fdpadku f\u00e1ze, teplotn\u00ed kompenzaci a indikaci vypnut\u00ed. Z dostupn\u00fdch \u00fadaj\u016f nen\u00ed z\u0159ejm\u00e1 t\u0159\u00edda vypnut\u00ed, re\u017eim resetov\u00e1n\u00ed, pomocn\u00e9 kontakty ani p\u0159esn\u00e9 p\u0159i\u0159azen\u00ed styka\u010d\u016f.<\/p>\n\n\n\n

4. Odd\u011blte \u0159\u00eddic\u00ed a ochrann\u00e9 funkce<\/h2>\n\n\n\n

Styka\u010d zaji\u0161\u0165uje \u0159\u00edzen\u00e9 sp\u00edn\u00e1n\u00ed. P\u0159et\u00ed\u017ekov\u00e9 rel\u00e9 pln\u00ed svou dokumentovanou funkci ochrany proti p\u0159et\u00ed\u017een\u00ed. Za\u0159\u00edzen\u00ed na ochranu proti zkratu pln\u00ed svou dokumentovanou funkci ochrany proti poruchov\u00e9mu proudu. N\u011bkter\u00e9 MPCB integruj\u00ed v\u00edce ne\u017e jednu funkci ochrany motoru, ale to neznamen\u00e1, \u017ee ka\u017ed\u00fd spou\u0161t\u011b\u010d motoru<\/a> architektura je stejn\u00e1.<\/p>\n\n\n\n

Tento Pr\u016fvodce v\u00fdb\u011brem st\u0159\u00edda\u010d\u016f st\u0159\u00eddav\u00e9ho proudu<\/a> vysv\u011btluje samostatn\u00e9 vstupy pro nap\u00e1jec\u00ed obvod, c\u00edvku a pomocn\u00e9 kontakty. Mezi zve\u0159ejn\u011bn\u00e9 p\u0159\u00edklady spole\u010dnosti RITOKS pat\u0159\u00ed tak\u00e9 ZSLE1-D uzav\u0159en\u00fd magnetick\u00fd spou\u0161t\u011b\u010d motoru<\/a>. Tyto odkazy uv\u00e1d\u011bj\u00ed p\u0159\u00edbuzn\u00e9 \u0159ady produkt\u016f, neznamenaj\u00ed v\u0161ak potvrzenou kompatibilitu.<\/p>\n\n\n\n

5. Koordinace vy\u017eaduje p\u0159esn\u00e9 podklady od v\u00fdrobce<\/h2>\n\n\n\n

Pokyny spole\u010dnosti Schneider Electric pro ochranu motor\u016f rozli\u0161uj\u00ed mezi odpojen\u00edm, ochranou proti zkratu, \u0159\u00edzen\u00edm a ochranou proti p\u0159et\u00ed\u017een\u00ed. Pokud se pou\u017e\u00edv\u00e1 v\u00edce za\u0159\u00edzen\u00ed, je nutn\u00e9 ov\u011b\u0159it jejich vz\u00e1jemnou koordinaci jako celek. Nesta\u010d\u00ed pouze shodn\u00fd proudov\u00fd rozsah nebo zna\u010dka v\u00fdrobce.<\/p>\n\n\n\n

Nezve\u0159ej\u0148ujte \u017e\u00e1dost o koordinaci typu 1 nebo typu 2, kombinaci jmenovit\u00fdch proud\u016f, nastaven\u00ed vyp\u00ednac\u00edho proudu ani nahrazen\u00ed sou\u010d\u00e1sti bez p\u0159esn\u00e9 koordina\u010dn\u00ed tabulky v\u00fdrobce pro vybranou sadu jisti\u010d\u016f, styka\u010d\u016f a rel\u00e9.<\/p>\n\n\n\n

\"Kontroln\u00ed
P\u0159ed pod\u00e1n\u00edm \u017e\u00e1dosti o koordinovanou kombinaci shrom\u00e1\u017ed\u011bte \u00fadaje o motoru, funkci a vstupech za\u0159\u00edzen\u00ed. Chyb\u011bj\u00edc\u00ed koordina\u010dn\u00ed tabulka znamen\u00e1, \u017ee nelze uplatnit n\u00e1rok na kompatibilitu.<\/figcaption><\/figure>\n\n\n\n

Zve\u0159ejn\u011bn\u00e9 p\u0159\u00edklady produktov\u00fdch \u0159ad RITOKS<\/h2>\n\n\n\n
Rodina<\/th>Ov\u011b\u0159en\u00fd ve\u0159ejn\u00fd rozsah<\/th>Hranice<\/th><\/tr><\/thead>
GYMP7 MPCB<\/td>T\u0159\u00edf\u00e1zov\u00e9; nastaviteln\u00fd rozsah 0,1\u201380 A v r\u00e1mci jednotliv\u00fdch modelov\u00fdch \u0159ad; tepeln\u00e1 ochrana proti p\u0159et\u00ed\u017een\u00ed a magnetick\u00e1 ochrana proti zkratu.<\/td>Pou\u017e\u00edvejte p\u0159esn\u00e9 tabulky model\u016f a nap\u011bt\u00ed; nep\u0159edpokl\u00e1dejte \u017e\u00e1dn\u00e9 kombinace p\u0159\u00edslu\u0161enstv\u00ed ani start\u00e9r\u016f.<\/td><\/tr>\n
P\u0159et\u00ed\u017eovac\u00ed rel\u00e9 ZS3RU<\/td>0,11\u2013100 A v r\u00e1mci jednotliv\u00fdch modelov\u00fdch \u0159ad; ochrana proti p\u0159et\u00ed\u017een\u00ed a ztr\u00e1t\u011b f\u00e1ze pro t\u0159\u00edf\u00e1zov\u00e9 asynchronn\u00ed motory.<\/td>T\u0159\u00edda v\u00fdpadku, re\u017eim resetov\u00e1n\u00ed a p\u0159esn\u00e9 p\u0159i\u0159azen\u00ed styka\u010d\u016f z\u016fst\u00e1vaj\u00ed neov\u011b\u0159en\u00e9.<\/td><\/tr>\n
Styka\u010d ZS3TF<\/td>\u0158\u00edzen\u00e9 sp\u00edn\u00e1n\u00ed s provozn\u00edmi parametry specifick\u00fdmi pro dan\u00fd model.<\/td>Styka\u010d neslou\u017e\u00ed jako ochrana proti p\u0159et\u00ed\u017een\u00ed ani zkratu.<\/td><\/tr>\n
Spou\u0161t\u011b\u010d ZSLE1-D<\/td>Byla zve\u0159ejn\u011bna \u0159ada magnetick\u00fdch spou\u0161t\u011b\u010d\u016f motor\u016f v p\u0159ilo\u017een\u00e9m dokumentu.<\/td>Je t\u0159eba potvrdit p\u0159esnou vnit\u0159n\u00ed architekturu a koordinaci.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Informace, kter\u00e9 je t\u0159eba uv\u00e9st v popt\u00e1vce na ochranu motor\u016f<\/h2>\n\n\n\n