{"id":20620,"date":"2025-12-14T01:53:01","date_gmt":"2025-12-13T17:53:01","guid":{"rendered":"https:\/\/viox.com\/?p=20620"},"modified":"2025-12-05T14:54:10","modified_gmt":"2025-12-05T06:54:10","slug":"iec-60947-3-utilization-categories-guide","status":"publish","type":"post","link":"https:\/\/test.viox.com\/cs\/iec-60947-3-utilization-categories-guide\/","title":{"rendered":"Jak rozli\u0161it n\u00edzkonap\u011b\u0165ov\u00e9 pojistky: Normy a t\u0159\u00eddy IEC 60269 (gG, aM, gPV)"},"content":{"rendered":"<div class=\"product-intro\">\n<figure><img decoding=\"async\" src=\"https:\/\/img.viox.com\/professional-header-image-showing-viox-branded-industrial-fuses-nh-type-cylindrical-fuses-with-iec-60269-markings-in-industrial-blue-and-gray-color-scheme.webp\" alt=\"Professional header image showing VIOX branded industrial fuses\" \/><figcaption><em>Obr\u00e1zek 1: IEC 60269 <a href=\"https:\/\/test.viox.com\/cs\/how-does-a-fuse-holder-work\/\">pojistky n\u00edzk\u00e9ho nap\u011bt\u00ed<\/a> jsou klasifikov\u00e1ny podle kategori\u00ed pou\u017eit\u00ed (gG, aM, gPV), kter\u00e9 definuj\u00ed jejich zam\u00fd\u0161len\u00e9 pou\u017eit\u00ed a provozn\u00ed charakteristiky. Spole\u010dnost VIOX Electric vyr\u00e1b\u00ed pojistky navr\u017een\u00e9 podle norem IEC 60269 pro pr\u016fmyslov\u00e9 aplikace, ochranu motor\u016f a fotovoltaick\u00e9 aplikace.<\/p>\n<p><\/em><\/figcaption><\/figure>\n<p>Kdy\u017e otev\u0159ete katalog dodavatele pojistek nebo zkontrolujete ozna\u010den\u00ed pojistky v pr\u016fmyslov\u00e9m panelu, naraz\u00edte na z\u00e1hadn\u00e9 p\u00edsmenn\u00e9 k\u00f3dy: gG, aM, gPV, gR, aR. Nejedn\u00e1 se o libovoln\u00e9 ozna\u010den\u00ed v\u00fdrobce \u2013 p\u0159edstavuj\u00ed kategorie pou\u017eit\u00ed IEC 60269, systematickou klasifikaci, kter\u00e1 definuje, jak\u00fd typ elektrick\u00e9 z\u00e1t\u011b\u017ee je ka\u017ed\u00e1 pojistka navr\u017eena k ochran\u011b a za jak\u00fdch podm\u00ednek funguje.<\/p>\n<p>Tento rozd\u00edl m\u00e1 v praxi z\u00e1sadn\u00ed v\u00fdznam. Univerz\u00e1ln\u00ed pojistka gG chr\u00e1n\u00edc\u00ed kabel sel\u017ee p\u0159ed\u010dasn\u011b, pokud je nespr\u00e1vn\u011b pou\u017eita pro motorov\u00fd provoz (kde je spr\u00e1vn\u00e1 aM), co\u017e umo\u017en\u00ed, aby se \u0161kodliv\u00e9 p\u0159et\u00ed\u017een\u00ed dostalo k vinut\u00ed motoru. Pojistka aM pro ochranu motoru pou\u017eit\u00e1 v obecn\u00e9m distribu\u010dn\u00edm obvodu poskytuje nedostate\u010dnou ochranu proti p\u0159et\u00ed\u017een\u00ed, \u010d\u00edm\u017e riskuje po\u0161kozen\u00ed kabelu nebo po\u017e\u00e1r. Standardn\u00ed AC pojistka pou\u017eit\u00e1 ve fotovoltaick\u00e9m DC obvodu m\u016f\u017ee katastrof\u00e1ln\u011b selhat, proto\u017ee DC oblouky samy neuhasnou p\u0159i nulov\u00e9m proudu jako AC.<\/p>\n<p>Pro elektroin\u017een\u00fdry specifikuj\u00edc\u00ed nadproudovou ochranu, v\u00fdrobce panel\u016f vyb\u00edraj\u00edc\u00ed komponenty a \u00fadr\u017eb\u00e1\u0159e vym\u011b\u0148uj\u00edc\u00ed pojistky je pochopen\u00ed kategori\u00ed pou\u017eit\u00ed IEC 60269 z\u00e1sadn\u00ed. P\u0159esto je klasifika\u010dn\u00ed syst\u00e9m mimo odborn\u00e9 kruhy st\u00e1le m\u00e1lo pochopen. Tato p\u0159\u00edru\u010dka vysv\u011btluje strukturu normy IEC 60269, dek\u00f3duje t\u0159i nejb\u011b\u017en\u011bj\u0161\u00ed t\u0159\u00eddy pojistek \u2013 gG (univerz\u00e1ln\u00ed), aM (ochrana motoru) a gPV (fotovoltaick\u00e9) \u2013 a poskytuje praktick\u00e1 krit\u00e9ria pro v\u00fdb\u011br pro slad\u011bn\u00ed typ\u016f pojistek s re\u00e1ln\u00fdmi aplikacemi.<\/p>\n<h2>Co je IEC 60269?<\/h2>\n<p><strong>IEC 60269<\/strong> je mezin\u00e1rodn\u00ed norma upravuj\u00edc\u00ed pojistky n\u00edzk\u00e9ho nap\u011bt\u00ed pro st\u0159\u00eddav\u00e9 obvody s frekvenc\u00ed do 1 000 V a stejnosm\u011brn\u00e9 obvody do 1 500 V. Tato norma, publikovan\u00e1 Technickou komis\u00ed 32\/Podkomis\u00ed 32B Mezin\u00e1rodn\u00ed elektrotechnick\u00e9 komise, stanovuje po\u017eadavky na v\u00fdkon, testovac\u00ed postupy a klasifika\u010dn\u00ed syst\u00e9my pro uzav\u0159en\u00e9 pojistkov\u00e9 vlo\u017eky omezuj\u00edc\u00ed proud s jmenovitou vyp\u00ednac\u00ed schopnost\u00ed alespo\u0148 6 kA.<\/p>\n<p>Norma je strukturov\u00e1na do sedmi \u010d\u00e1st\u00ed, z nich\u017e ka\u017ed\u00e1 se zab\u00fdv\u00e1 specifick\u00fdmi aplika\u010dn\u00edmi oblastmi:<\/p>\n<p><strong>IEC 60269-1<\/strong> (Obecn\u00e9 po\u017eadavky, vyd\u00e1n\u00ed 5.0, 2024) stanovuje z\u00e1kladn\u00ed po\u017eadavky pro v\u0161echny pojistkov\u00e9 vlo\u017eky, v\u010detn\u011b jmenovit\u00e9ho nap\u011bt\u00ed\/proudu, definic vyp\u00ednac\u00ed schopnosti, ov\u011b\u0159en\u00ed \u010dasov\u011b-proudov\u00e9 charakteristiky a z\u00e1kladn\u00edch testovac\u00edch protokol\u016f. Tato \u010d\u00e1st definuje r\u00e1mec, na kter\u00e9m stav\u00ed v\u0161echny n\u00e1sleduj\u00edc\u00ed \u010d\u00e1sti.<\/p>\n<p><strong>IEC 60269-2<\/strong> (Pr\u016fmyslov\u00e9 pojistky, konsolidovan\u00e9 vyd\u00e1n\u00ed 2024) poskytuje dopl\u0148kov\u00e9 po\u017eadavky pro pojistky, se kter\u00fdmi manipuluj\u00ed a vym\u011b\u0148uj\u00ed je pouze opr\u00e1vn\u011bn\u00e9 osoby v pr\u016fmyslov\u00fdch aplikac\u00edch. Vyjmenov\u00e1v\u00e1 standardizovan\u00e9 pojistkov\u00e9 syst\u00e9my A a\u017e K \u2013 v\u010detn\u011b no\u017eov\u00fdch pojistek NH, \u0161roubov\u00fdch pojistek BS, v\u00e1lcov\u00fdch pojistek a dal\u0161\u00edch \u2013 a specifikuje po\u017eadavky na v\u00fdkon pro pr\u016fmyslov\u00e9 pracovn\u00ed cykly s vysok\u00fdmi potenci\u00e1ln\u00edmi poruchov\u00fdmi proudy.<\/p>\n<p><strong>IEC 60269-3<\/strong> (Dom\u00e1c\u00ed pojistky, vyd\u00e1n\u00ed 5.0, 2024) se zab\u00fdv\u00e1 pojistkami pro provoz nekvalifikovan\u00fdmi osobami v obytn\u00fdch a podobn\u00fdch aplikac\u00edch. Na\u0159izuje mechanick\u00e9 funkce nezam\u011bnitelnosti, aby se zabr\u00e1nilo nespr\u00e1vn\u00e9 v\u00fdm\u011bn\u011b jmenovit\u00e9 hodnoty, a zaji\u0161\u0165uje bezpe\u010dnou manipulaci netr\u00e9novan\u00fdmi u\u017eivateli.<\/p>\n<p><strong>IEC 60269-4<\/strong> (Ochrana polovodi\u010d\u016f, vyd\u00e1n\u00ed 6.0, 2024) se zab\u00fdv\u00e1 rychl\u00fdmi pojistkov\u00fdmi vlo\u017ekami navr\u017een\u00fdmi speci\u00e1ln\u011b pro ochranu polovodi\u010dov\u00fdch za\u0159\u00edzen\u00ed (usm\u011br\u0148ova\u010d\u016f, tyristor\u016f, v\u00fdkonov\u00fdch tranzistor\u016f) p\u0159ed po\u0161kozen\u00edm zkratem, vy\u017eaduj\u00edc\u00ed \u010dasov\u011b-proudov\u00e9 charakteristiky mnohem rychlej\u0161\u00ed ne\u017e univerz\u00e1ln\u00ed pojistky.<\/p>\n<p><strong>IEC 60269-5<\/strong> (Pokyny pro aplikaci) poskytuje krit\u00e9ria pro v\u00fdb\u011br, metody koordinace a praktick\u00e9 pokyny pro in\u017een\u00fdry specifikuj\u00edc\u00ed pojistky v r\u016fzn\u00fdch oblastech.<\/p>\n<p><strong>IEC 60269-6<\/strong> (Fotovoltaick\u00e9 syst\u00e9my) stanovuje dopl\u0148kov\u00e9 po\u017eadavky pro pojistkov\u00e9 vlo\u017eky chr\u00e1n\u00edc\u00ed sol\u00e1rn\u00ed fotovoltaick\u00e9 energetick\u00e9 syst\u00e9my, kter\u00e9 \u0159e\u0161\u00ed jedine\u010dn\u00e9 v\u00fdzvy p\u0159eru\u0161en\u00ed stejnosm\u011brn\u00e9ho proudu bez p\u0159irozen\u00fdch proudov\u00fdch nul a provozn\u00edho prost\u0159ed\u00ed fotovoltaiky.<\/p>\n<p><strong>IEC 60269-7<\/strong> (Bateriov\u00e9 syst\u00e9my) definuje po\u017eadavky na pojistkov\u00e9 vlo\u017eky chr\u00e1n\u00edc\u00ed syst\u00e9my pro ukl\u00e1d\u00e1n\u00ed energie do bateri\u00ed, co\u017e je relativn\u011b ned\u00e1vn\u00fd p\u0159\u00edr\u016fstek odr\u00e1\u017eej\u00edc\u00ed r\u016fst stacion\u00e1rn\u00edch instalac\u00ed bateri\u00ed.<\/p>\n<p>Norma sjednocuje elektrick\u00e9 charakteristiky a \u010dasov\u011b-proudov\u00e9 chov\u00e1n\u00ed pro rozm\u011brov\u011b zam\u011bniteln\u00e9 pojistky, zlep\u0161uje spolehlivost syst\u00e9mu a zjednodu\u0161uje \u00fadr\u017ebu v r\u00e1mci historicky rozt\u0159\u00ed\u0161t\u011bn\u00fdch n\u00e1rodn\u00edch syst\u00e9m\u016f. Pro ka\u017edou pojistku vyhovuj\u00edc\u00ed norm\u011b IEC 60269 mus\u00ed v\u00fdrobci ov\u011b\u0159it v\u00fdkon prost\u0159ednictv\u00edm definovan\u00fdch test\u016f: n\u00e1r\u016fst teploty a ztr\u00e1ta v\u00fdkonu, chov\u00e1n\u00ed p\u0159i taven\u00ed a netaven\u00ed p\u0159i specifikovan\u00fdch n\u00e1sobc\u00edch jmenovit\u00e9ho proudu, ov\u011b\u0159en\u00ed \u010dasov\u011b-proudov\u00e9 charakteristiky (\u201cbr\u00e1ny\u201d) a validace vyp\u00ednac\u00ed schopnosti.<\/p>\n<h2>Pochopen\u00ed syst\u00e9mu klasifikace pojistek<\/h2>\n<p>IEC 60269 klasifikuje pojistky pomoc\u00ed dvou p\u00edsmen <strong>k\u00f3du kategorie pou\u017eit\u00ed<\/strong> kter\u00fd definuje zam\u00fd\u0161len\u00e9 pou\u017eit\u00ed a provozn\u00ed charakteristiky pojistky. Tento klasifika\u010dn\u00ed syst\u00e9m uzn\u00e1v\u00e1, \u017ee ochrana kabelu p\u0159ed p\u0159et\u00ed\u017een\u00edm klade z\u00e1sadn\u011b odli\u0161n\u00e9 po\u017eadavky ne\u017e ochrana motorov\u00e9ho obvodu, kter\u00fd za\u017e\u00edv\u00e1 vysok\u00e9 spou\u0161t\u011bc\u00ed proudy, nebo stejnosm\u011brn\u00e9ho fotovoltaick\u00e9ho \u0159et\u011bzce, kter\u00e9mu chyb\u00ed p\u0159irozen\u00e9 proudov\u00e9 nuly pro zh\u00e1\u0161en\u00ed oblouku.<\/p>\n<p>Struktura dvoup\u00edsmenn\u00e9ho k\u00f3du funguje n\u00e1sledovn\u011b:<\/p>\n<p><strong>Prvn\u00ed p\u00edsmeno<\/strong> ozna\u010duje <strong>provozn\u00ed rozsah<\/strong>:<\/p>\n<ul>\n<li><strong>\u201cg\u201d<\/strong> (n\u011bmecky: <em>gesamt<\/em>, \u201ccelkem\u201d) = Univerz\u00e1ln\u00ed, plnorozsahov\u00e1 ochrana pokr\u00fdvaj\u00edc\u00ed oblasti p\u0159et\u00ed\u017een\u00ed i zkratu. Pojistka funguje od dlouhodob\u00fdch n\u00edzk\u00fdch nadproud\u016f (a\u017e do oblasti vypnut\u00ed za jednu hodinu) a\u017e po zkraty s vysokou intenzitou.<\/li>\n<li><strong>\u201ca\u201d<\/strong> (n\u011bmecky: <em>ausschalten<\/em>, \u201c\u010d\u00e1ste\u010dn\u00fd\u201d) = \u010c\u00e1ste\u010dn\u00fd rozsah, ochrana pouze proti zkratu. Pojistka je navr\u017eena tak, aby odstra\u0148ovala poruchy, ale nefungovala b\u011bhem norm\u00e1ln\u00edch p\u0159et\u00ed\u017een\u00ed nebo p\u0159echodn\u00fdch jev\u016f p\u0159i spou\u0161t\u011bn\u00ed motoru. Ochrana proti p\u0159et\u00ed\u017een\u00ed mus\u00ed b\u00fdt zaji\u0161t\u011bna samostatn\u00fdmi za\u0159\u00edzen\u00edmi (tepeln\u00e1 rel\u00e9 p\u0159et\u00ed\u017een\u00ed, jisti\u010de pro ochranu motoru).<\/li>\n<\/ul>\n<p><strong>Druh\u00e9 p\u00edsmeno<\/strong> ozna\u010duje <strong>chr\u00e1n\u011bn\u00fd objekt nebo aplika\u010dn\u00ed dom\u00e9na<\/strong>:<\/p>\n<ul>\n<li><strong>\u201cG\u201d<\/strong> = Obecn\u00e1 ochrana kabel\u016f, vodi\u010d\u016f a distribu\u010dn\u00edch obvod\u016f<\/li>\n<li><strong>\u201cM\u201d<\/strong> = Motorov\u00e9 obvody a za\u0159\u00edzen\u00ed vystaven\u00e9 vysok\u00e9mu z\u00e1b\u011brov\u00e9mu proudu<\/li>\n<li><strong>\u201cPV\u201d<\/strong> = Fotovoltaick\u00e9 (sol\u00e1rn\u00ed) energetick\u00e9 syst\u00e9my se stejnosm\u011brn\u00fdmi provozn\u00edmi podm\u00ednkami<\/li>\n<li><strong>\u201cR\u201d<\/strong> = Polovodi\u010dov\u00e1 za\u0159\u00edzen\u00ed (usm\u011br\u0148ova\u010de, tyristory, v\u00fdkonov\u00e9 tranzistory) vy\u017eaduj\u00edc\u00ed ultrarychlou odezvu<\/li>\n<li><strong>\u201cL\u201d<\/strong> = Kabely a vodi\u010de (v modern\u00ed praxi z velk\u00e9 \u010d\u00e1sti nahrazeno \u201cG\u201d)<\/li>\n<li><strong>\u201cTr\u201d<\/strong> = Transform\u00e1tory<\/li>\n<\/ul>\n<p>Kombinac\u00ed t\u011bchto p\u00edsmen kategorie pou\u017eit\u00ed p\u0159esn\u011b definuje jak provozn\u00ed chov\u00e1n\u00ed pojistky, tak jej\u00ed zam\u00fd\u0161len\u00e9 pou\u017eit\u00ed. <strong>gG<\/strong> znamen\u00e1 univerz\u00e1ln\u00ed, plnorozsahovou ochranu pro kabely a distribuci. <strong>aM<\/strong> znamen\u00e1 \u010d\u00e1ste\u010dn\u00fd rozsah (pouze zkrat) ochranu pro motorov\u00e9 obvody. <strong>gPV<\/strong> znamen\u00e1 univerz\u00e1ln\u00ed, plnorozsahovou ochranu speci\u00e1ln\u011b navr\u017eenou pro fotovoltaick\u00e9 DC syst\u00e9my.<\/p>\n<p>Tato klasifikace p\u0159\u00edmo ur\u010duje <strong>\u010dasov\u011b-proudovou charakteristiku<\/strong>\u2013 k\u0159ivku, kter\u00e1 zn\u00e1zor\u0148uje, jak dlouho trv\u00e1 pojistce vypnut\u00ed p\u0159i r\u016fzn\u00fdch \u00farovn\u00edch nadproudu \u2013 a jej\u00ed <strong>vyp\u00ednac\u00ed schopnost<\/strong>, maxim\u00e1ln\u00ed poruchov\u00fd proud, kter\u00fd m\u016f\u017ee bezpe\u010dn\u011b p\u0159eru\u0161it. Pochopen\u00ed t\u011bchto kategori\u00ed je z\u00e1sadn\u00ed, proto\u017ee pou\u017eit\u00ed nespr\u00e1vn\u00e9 t\u0159\u00eddy vytv\u00e1\u0159\u00ed p\u0159edv\u00eddateln\u00e9 re\u017eimy selh\u00e1n\u00ed: nedostate\u010dn\u00e1 ochrana, obt\u011b\u017euj\u00edc\u00ed vyp\u00edn\u00e1n\u00ed nebo katastrof\u00e1ln\u00ed selh\u00e1n\u00ed p\u0159eru\u0161en\u00ed oblouku.<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/img.viox.com\/professional-comparison-infographic-showing-viox-iec-60269-fuse-classes-gg-general-purpose-am-motor-protection-and-gpv-photovoltaic-with-technical-characteristics.webp\" alt=\"VIOX IEC 60269 fuse class comparison infographic\" \/><figcaption>Obr\u00e1zek 2: Srovn\u00e1n\u00ed t\u0159\u00edd pojistek VIOX IEC 60269. T\u0159i prim\u00e1rn\u00ed kategorie \u2013 gG pro obecnou ochranu kabel\u016f, aM pro motorov\u00e9 obvody s vysok\u00fdmi spou\u0161t\u011bc\u00edmi proudy a gPV pro DC fotovoltaick\u00e9 syst\u00e9my \u2013 slou\u017e\u00ed odli\u0161n\u00fdm aplikac\u00edm se specifick\u00fdmi \u010dasov\u011b-proudov\u00fdmi charakteristikami a po\u017eadavky na vyp\u00ednac\u00ed schopnost.<\/figcaption><\/figure>\n<h2>T\u0159\u00edda gG: Univerz\u00e1ln\u00ed pojistky<\/h2>\n<p><strong>gG<\/strong> je v\u00fdchoz\u00ed t\u0159\u00edda pojistek pro ochranu kabel\u016f a vodi\u010d\u016f v dom\u00e1c\u00edch i pr\u016fmyslov\u00fdch instalac\u00edch. Ozna\u010den\u00ed se rozpad\u00e1 na <strong>g<\/strong> (pln\u00fd rozsah, pokr\u00fdvaj\u00edc\u00ed p\u0159et\u00ed\u017een\u00ed a zkrat) + <strong>G<\/strong> (obecn\u00e1 ochrana vodi\u010d\u016f\/kabel\u016f\/distribu\u010dn\u00edch obvod\u016f). Toto je pojistka, kterou specifikujete p\u0159i ochran\u011b nap\u00e1je\u010d\u016f, odbo\u010dn\u00fdch obvod\u016f a distribu\u010dn\u00edch syst\u00e9m\u016f p\u0159en\u00e1\u0161ej\u00edc\u00edch sm\u00ed\u0161en\u00e9 nebo p\u0159ev\u00e1\u017en\u011b odporov\u00e9 z\u00e1t\u011b\u017ee.<\/p>\n<h3>Charakteristiky a \u010dasov\u011b-proudov\u00e9 chov\u00e1n\u00ed<\/h3>\n<p>Pojistka gG poskytuje nep\u0159etr\u017eitou ochranu od m\u00edrn\u00fdch p\u0159et\u00ed\u017een\u00ed a\u017e po katastrof\u00e1ln\u00ed zkraty. Jej\u00ed \u010dasov\u011b-proudov\u00e1 charakteristika pokr\u00fdv\u00e1 cel\u00e9 provozn\u00ed spektrum:<\/p>\n<ul>\n<li><strong>Oblast dlouhodob\u00e9ho p\u0159et\u00ed\u017een\u00ed<\/strong>: P\u0159i 1,5n\u00e1sobku jmenovit\u00e9ho proudu (In) trv\u00e1 typick\u00e9 pojistce gG 1\u20134 hodiny, ne\u017e se p\u0159ep\u00e1l\u00ed, \u010d\u00edm\u017e zaji\u0161\u0165uje tepelnou ochranu kabelu bez zbyte\u010dn\u00e9ho vyp\u00edn\u00e1n\u00ed p\u0159i kr\u00e1tkodob\u00fdch p\u0159echodn\u00fdch jevech.<\/li>\n<li><strong>Oblast st\u0159edn\u00edho p\u0159et\u00ed\u017een\u00ed<\/strong>: P\u0159i 5\u00d7In se doba vypnut\u00ed zkr\u00e1t\u00ed na 2\u20135 sekund, \u010d\u00edm\u017e se odstran\u00ed trval\u00e1 p\u0159et\u00ed\u017een\u00ed d\u0159\u00edve, ne\u017e dojde k po\u0161kozen\u00ed izolace kabelu.<\/li>\n<li><strong>Oblast zkratu<\/strong>: P\u0159i 10\u00d7In a v\u00fd\u0161e se pojistka vypne b\u011bhem 0,1\u20130,2 sekundy, \u010d\u00edm\u017e poskytuje rychlou ochranu proti poruch\u00e1m.<\/li>\n<\/ul>\n<p>Tato odstup\u0148ovan\u00e1 odezva odpov\u00edd\u00e1 tepeln\u00fdm limit\u016fm kabelu: pojistka toleruje kr\u00e1tkodob\u00e9 ne\u0161kodn\u00e9 p\u0159echodn\u00e9 jevy, ale odstra\u0148uje trval\u00e9 nadproudy d\u0159\u00edve, ne\u017e vodi\u010d dos\u00e1hne \u0161kodliv\u00fdch teplot. \u010casov\u011b-proudov\u00e1 k\u0159ivka je ov\u011b\u0159ov\u00e1na podle standardizovan\u00fdch \u201cbran\u201d definovan\u00fdch v IEC 60269-1, co\u017e zaji\u0161\u0165uje konzistentn\u00ed v\u00fdkon u r\u016fzn\u00fdch v\u00fdrobc\u016f.<\/p>\n<h3>Vyp\u00ednac\u00ed schopnost a fyzick\u00e9 formy<\/h3>\n<p>IEC 60269 na\u0159izuje minim\u00e1ln\u00ed vyp\u00ednac\u00ed schopnost 6 kA pro v\u0161echny pojistkov\u00e9 vlo\u017eky v s\u00e9rii. Pr\u016fmyslov\u00e9 pojistky gG \u2013 zejm\u00e9na syst\u00e9my NH (no\u017eov\u00e9) standardizovan\u00e9 podle IEC 60269-2 \u2013 b\u011b\u017en\u011b p\u0159ekra\u010duj\u00ed vyp\u00ednac\u00ed schopnost 100 kA, co\u017e je \u010din\u00ed vhodn\u00fdmi pro instalace s velmi vysok\u00fdmi potenci\u00e1ln\u00edmi zkratov\u00fdmi proudy v bl\u00edzkosti sekund\u00e1rn\u00edch vinut\u00ed transform\u00e1tor\u016f nebo hlavn\u00edch rozvodn\u00fdch bod\u016f.<\/p>\n<p>Pojistky gG jsou k dispozici v n\u011bkolika fyzick\u00fdch form\u00e1ch:<\/p>\n<ul>\n<li><strong>Pojistky NH<\/strong> (no\u017eov\u00e9 kontakty dle DIN): Velikosti 000, 00, 0, 1, 2, 3, 4 pokr\u00fdvaj\u00edc\u00ed 2A a\u017e 1250A, s keramick\u00fdmi t\u011bly a no\u017eov\u00fdmi kontakty pro \u0161roubovou mont\u00e1\u017e na panel<\/li>\n<li><strong>V\u00e1lcov\u00e9 pojistky<\/strong> (patronov\u00e9): Standardn\u00ed pr\u016fm\u011bry 10\u00d738mm, 14\u00d751mm, 22\u00d758mm pro jmenovit\u00e9 proudy od 1A do 125A, pou\u017e\u00edvan\u00e9 v pojistkov\u00fdch dr\u017e\u00e1c\u00edch nebo z\u00e1kladn\u00e1ch na DIN li\u0161tu<\/li>\n<li><strong>\u0160roubov\u00e9 pojistky BS<\/strong> (\u010dtvercov\u00e9 t\u011blo dle britsk\u00e9 normy): Pr\u016fmyslov\u00e9 velikosti pro aplikace s vysok\u00fdm proudem<\/li>\n<li><strong>Dom\u00e1c\u00ed patronov\u00e9 pojistky<\/strong> dle IEC 60269-3: S mechanick\u00fdm k\u00f3dov\u00e1n\u00edm, kter\u00e9 zabra\u0148uje nespr\u00e1vn\u00e9 v\u00fdm\u011bn\u011b jmenovit\u00e9ho proudu<\/li>\n<\/ul>\n<h3>Typick\u00e9 aplikace<\/h3>\n<p>Pojistky gG jsou tahounem elektrick\u00e9 distribuce:<\/p>\n<ul>\n<li><strong>Ochrana nap\u00e1je\u010d\u016f<\/strong>: Ochrana hlavn\u00edch a odbo\u010dn\u00fdch obvod\u016f v rozvad\u011b\u010d\u00edch, panelov\u00fdch rozvad\u011b\u010d\u00edch a ovl\u00e1dac\u00edch sk\u0159\u00edn\u00edch<\/li>\n<li><strong>Ochrana kabel\u016f<\/strong>: P\u0159izp\u016fsoben\u00ed jmenovit\u00e9ho proudu pojistky proudov\u00e9 zat\u00ed\u017eitelnosti kabelu, aby se zabr\u00e1nilo po\u0161kozen\u00ed izolace trval\u00fdm p\u0159et\u00ed\u017een\u00edm<\/li>\n<li><strong>Sv\u011bteln\u00e9 obvody<\/strong>: Komer\u010dn\u00ed a pr\u016fmyslov\u00e9 rozvody osv\u011btlen\u00ed (odporov\u00e9 \u017e\u00e1rovkov\u00e9 i induk\u010dn\u00ed v\u00fdbojkov\u00e9 osv\u011btlen\u00ed)<\/li>\n<li><strong>Obecn\u00fd rozvod energie<\/strong>: Sm\u00ed\u0161en\u00e9 z\u00e1t\u011b\u017ee v komer\u010dn\u00edch budov\u00e1ch, v\u00fdrobn\u00edch za\u0159\u00edzen\u00edch a infrastruktu\u0159e<\/li>\n<li><strong>Ochrana prim\u00e1rn\u00edho\/sekund\u00e1rn\u00edho vinut\u00ed transform\u00e1toru<\/strong>: Tam, kde nen\u00ed nadm\u011brn\u00fd magnetiza\u010dn\u00ed n\u00e1razov\u00fd proud<\/li>\n<\/ul>\n<h3>Koordinace a selektivita<\/h3>\n<p>Pro kask\u00e1dov\u00e9 pojistky gG (p\u0159ed\u0159azen\u00e9 a pod\u0159azen\u00e9 ve stejn\u00e9m obvodu) stanov\u00ed aplika\u010dn\u00ed pokyny IEC 60269-5 a \u00fadaje v\u00fdrobce <strong>pravidlo 1,6\u00d7<\/strong>: celkov\u00e9 selektivity se obvykle dos\u00e1hne, kdy\u017e je jmenovit\u00fd proud p\u0159ed\u0159azen\u00e9 pojistky alespo\u0148 1,6kr\u00e1t vy\u0161\u0161\u00ed ne\u017e jmenovit\u00fd proud pod\u0159azen\u00e9 pojistky. Pro jin\u00e9 kombinace za\u0159\u00edzen\u00ed (gG s <a href=\"https:\/\/test.viox.com\/cs\/mcb\/\">jisti\u010de<\/a>, <a href=\"https:\/\/test.viox.com\/cs\/ac-contactor\/\">styka\u010de<\/a>, nebo jin\u00e9 t\u0159\u00eddy pojistek) mus\u00ed b\u00fdt selektivita ov\u011b\u0159ena porovn\u00e1n\u00edm \u010dasov\u011b-proudov\u00fdch k\u0159ivek a propu\u0161t\u011bn\u00e9 energie (I\u00b2t) v cel\u00e9m rozsahu poruch.<\/p>\n<h3>Krit\u00e9ria v\u00fdb\u011bru<\/h3>\n<p>Specifikujte gG, kdy\u017e:<\/p>\n<ul>\n<li>Z\u00e1t\u011b\u017e je p\u0159ev\u00e1\u017en\u011b odporov\u00e1 nebo sm\u00ed\u0161en\u00e1 (osv\u011btlen\u00ed, topen\u00ed, v\u0161eobecn\u00e1 distribuce)<\/li>\n<li>Je vy\u017eadov\u00e1na plnohodnotn\u00e1 ochrana proti p\u0159et\u00ed\u017een\u00ed a zkratu v jednom za\u0159\u00edzen\u00ed<\/li>\n<li>Aplikace nezahrnuje vysok\u00fd rozb\u011bhov\u00fd proud motoru nebo specializovan\u00e9 DC\/PV pou\u017eit\u00ed<\/li>\n<li>Instalace odpov\u00edd\u00e1 oblastem IEC 60269-2 (pr\u016fmyslov\u00e9) nebo IEC 60269-3 (dom\u00e1c\u00ed)<\/li>\n<\/ul>\n<p><strong>Nepou\u017e\u00edvejte gG<\/strong> pro motorov\u00e9 obvody, kde rozb\u011bhov\u00fd proud zp\u016fsobuje zbyte\u010dn\u00e9 vyp\u00edn\u00e1n\u00ed (pou\u017eijte aM), nebo pro DC fotovoltaick\u00e9 syst\u00e9my, kde pojistky jmenovit\u00e9 pro AC nemus\u00ed p\u0159eru\u0161it DC oblouky (pou\u017eijte gPV).<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/img.viox.com\/viox-industrial-fuses-installed-in-professional-control-panel-showing-nh-type-fuses-mounted-in-fuse-carriers-with-organized-wiring-and-din-rail-components.webp\" alt=\"VIOX gG fuses installed in industrial distribution panel\" \/><figcaption>Obr\u00e1zek 3: Pojistky VIOX gG instalovan\u00e9 v pr\u016fmyslov\u00e9m rozvad\u011b\u010di. Pojistky typu NH poskytuj\u00ed plnohodnotnou ochranu kabel\u016f a nap\u00e1je\u010d\u016f s vyp\u00ednac\u00ed schopnost\u00ed p\u0159esahuj\u00edc\u00ed 100 kA pro instalace s vysokou poruchovost\u00ed. Profesion\u00e1ln\u00ed instalace zaji\u0161\u0165uje spr\u00e1vnou koordinaci a selektivitu.<\/figcaption><\/figure>\n<h2>T\u0159\u00edda aM: Pojistky pro ochranu motor\u016f<\/h2>\n<p><strong>aM<\/strong> pojistky jsou navr\u017eeny speci\u00e1ln\u011b pro motorov\u00e9 obvody a za\u0159\u00edzen\u00ed vystaven\u00e1 vysok\u00fdm rozb\u011bhov\u00fdm (blokovan\u00fdm rotorov\u00fdm) proud\u016fm. Ozna\u010den\u00ed se rozpad\u00e1 na <strong>a<\/strong> (\u010d\u00e1ste\u010dn\u00fd rozsah, pouze ochrana proti zkratu) + <strong>M<\/strong> (motorov\u00e9 obvody). Na rozd\u00edl od pojistek gG, kter\u00e9 poskytuj\u00ed plnou ochranu proti p\u0159et\u00ed\u017een\u00ed, pojistky aM z\u00e1m\u011brn\u011b toleruj\u00ed p\u0159echodn\u00e9 jevy p\u0159i spou\u0161t\u011bn\u00ed motoru \u2013 kter\u00e9 mohou dos\u00e1hnout 5\u20138n\u00e1sobku jmenovit\u00e9ho proudu motoru p\u0159i pln\u00e9m zat\u00ed\u017een\u00ed \u2013 a p\u0159itom st\u00e1le poskytuj\u00ed robustn\u00ed vypnut\u00ed zkratu.<\/p>\n<h3>Pro\u010d motorov\u00e9 obvody pot\u0159ebuj\u00ed specializovan\u00e9 pojistky<\/h3>\n<p>Kdy\u017e se induk\u010dn\u00ed motor spou\u0161t\u00ed, odeb\u00edr\u00e1 proud blokovan\u00e9ho rotoru, typicky 6\u20138\u00d7 jeho jmenovit\u00fd proud p\u0159i pln\u00e9m zat\u00ed\u017een\u00ed po dobu n\u011bkolika sekund, dokud se rotor nezrychl\u00ed na provozn\u00ed ot\u00e1\u010dky. Pojistka gG dimenzovan\u00e1 na provozn\u00ed proud motoru by se p\u0159i ka\u017ed\u00e9m spu\u0161t\u011bn\u00ed p\u0159ep\u00e1lila. P\u0159edimenzov\u00e1n\u00ed pojistky gG, aby tolerovala spou\u0161t\u011bn\u00ed, eliminuje ochranu proti p\u0159et\u00ed\u017een\u00ed, \u010d\u00edm\u017e se vinut\u00ed motoru st\u00e1v\u00e1 zraniteln\u00fdm v\u016f\u010di po\u0161kozen\u00ed trval\u00fdm nadproudem.<\/p>\n<p>T\u0159\u00edda aM \u0159e\u0161\u00ed toto dilema t\u00edm, \u017ee poskytuje <strong>\u010d\u00e1ste\u010dn\u00fd rozsah<\/strong> ochrana:<\/p>\n<ul>\n<li><strong>Umo\u017e\u0148uje spou\u0161t\u011bn\u00ed motoru<\/strong>: Pojistkov\u00fd prvek a \u010dasov\u011b-proudov\u00e1 charakteristika jsou navr\u017eeny tak, aby vydr\u017eely rozb\u011bhov\u00fd proud motoru bez vypnut\u00ed, a to i p\u0159i opakovan\u00fdch spou\u0161t\u011bc\u00edch cyklech.<\/li>\n<li><strong>Vyp\u00edn\u00e1 zkraty<\/strong>: Navzdory toleranci spou\u0161t\u011bc\u00edch proud\u016f pojistka rychle vypne skute\u010dn\u00e9 poruchov\u00e9 proudy, kter\u00e9 p\u0159ekra\u010duj\u00ed \u00farovn\u011b proudu blokovan\u00e9ho rotoru motoru.<\/li>\n<li><strong>Vy\u017eaduje samostatnou ochranu proti p\u0159et\u00ed\u017een\u00ed<\/strong>: Proto\u017ee pojistky aM nefunguj\u00ed v oblasti p\u0159et\u00ed\u017een\u00ed, mus\u00ed b\u00fdt tepeln\u00e1 ochrana motoru zaji\u0161t\u011bna samostatn\u00fdmi za\u0159\u00edzen\u00edmi (tepeln\u00e1 nadproudov\u00e1 rel\u00e9, motorov\u00e9 jisti\u010de).<\/li>\n<\/ul>\n<p>Toto rozd\u011blen\u00ed pr\u00e1ce \u2013 aM pro ochranu proti poruch\u00e1m, tepeln\u00e1 za\u0159\u00edzen\u00ed pro p\u0159et\u00ed\u017een\u00ed \u2013 je standardn\u00ed prax\u00ed v pr\u016fmyslov\u00e9m \u0159\u00edzen\u00ed motor\u016f.<\/p>\n<h3>Charakteristiky a \u010dasov\u011b-proudov\u00e9 chov\u00e1n\u00ed<\/h3>\n<p>Pojistky aM maj\u00ed z\u00e1sadn\u011b odli\u0161n\u00e9 \u010dasov\u011b-proudov\u00e9 k\u0159ivky ne\u017e gG:<\/p>\n<ul>\n<li><strong>\u017d\u00e1dn\u00fd dlouhodob\u00fd provoz p\u0159i p\u0159et\u00ed\u017een\u00ed<\/strong>: Na rozd\u00edl od gG se pojistky aM z\u00e1m\u011brn\u011b nep\u0159ep\u00e1l\u00ed p\u0159i 1,5\u20132\u00d7In. Toleruj\u00ed trval\u00e9 proudy v rozsahu spou\u0161t\u011bn\u00ed motoru bez z\u00e1sahu.<\/li>\n<li><strong>Vypnut\u00ed zkratu<\/strong>: P\u0159i proudech v\u00fdrazn\u011b nad proudem blokovan\u00e9ho rotoru motoru (typicky &gt;10\u201315\u00d7In) se pojistka vypne rychle, podobn\u011b jako gG v oblasti poruchy.<\/li>\n<li><strong>Odolnost v\u016f\u010di spou\u0161t\u011bc\u00edmu zat\u00ed\u017een\u00ed<\/strong>: Tepeln\u00e1 hmotnost a konstrukce pojistkov\u00e9ho prvku mu umo\u017e\u0148uj\u00ed absorbovat energii I\u00b2t spou\u0161t\u011bn\u00ed motoru bez po\u0161kozen\u00ed, co\u017e je ov\u011b\u0159eno testov\u00e1n\u00edm podle IEC 60269-2.<\/li>\n<\/ul>\n<h3>Vyp\u00ednac\u00ed schopnost a fyzick\u00e9 formy<\/h3>\n<p>Pojistky aM se vyr\u00e1b\u011bj\u00ed ve stejn\u00fdch fyzick\u00fdch form\u00e1tech jako gG \u2013 prim\u00e1rn\u011b no\u017eov\u00e9 NH a v\u00e1lcov\u00e9 patronov\u00e9 \u2013 ale s odli\u0161nou konstrukc\u00ed vnit\u0159n\u00edho prvku. Pr\u016fmyslov\u00e9 NH pojistky aM b\u011b\u017en\u011b dosahuj\u00ed vyp\u00ednac\u00ed schopnosti &gt;100 kA, co\u017e je identick\u00e9 s ekvivalenty gG, proto\u017ee ob\u011b mus\u00ed p\u0159eru\u0161it stejn\u00e9 potenci\u00e1ln\u00ed poruchov\u00e9 proudy v pr\u016fmyslov\u00fdch instalac\u00edch.<\/p>\n<h3>Typick\u00e9 aplikace<\/h3>\n<p>Pojistky aM jsou standardn\u00ed volbou pro ochranu motor\u016f v pr\u016fmyslov\u00e9m \u0159\u00edzen\u00ed:<\/p>\n<ul>\n<li><strong>Nap\u00e1je\u010de motor\u016f<\/strong>: Hlavn\u00ed pojistky chr\u00e1n\u00edc\u00ed jednotliv\u00e9 motorov\u00e9 obvody v rozvad\u011b\u010d\u00edch motor\u016f (MCC), s navazuj\u00edc\u00edmi styka\u010di a <a href=\"https:\/\/test.viox.com\/cs\/what-are-thermal-overload-relays\/\">tepeln\u00fdmi nadproudov\u00fdmi rel\u00e9<\/a> dopl\u0148uj\u00edc\u00ed sch\u00e9ma ochrany<\/li>\n<li><strong>P\u0159\u00edm\u00e9 spou\u0161t\u011b\u010de (DOL)<\/strong>: Kombinovan\u00e9 se styka\u010di a nadproudov\u00fdmi ochranami ve spou\u0161t\u011bc\u00edch sestav\u00e1ch pro \u010derpadla, ventil\u00e1tory, kompresory a dopravn\u00edky<\/li>\n<li><strong>Procesn\u00ed za\u0159\u00edzen\u00ed<\/strong>: Motory poh\u00e1n\u011bj\u00edc\u00ed pr\u016fmyslov\u00e9 stroje, kde se pou\u017e\u00edv\u00e1 p\u0159\u00edm\u00e9 spou\u0161t\u011bn\u00ed<\/li>\n<li><strong>Syst\u00e9my HVAC<\/strong>: Velk\u00e9 kompresorov\u00e9 a ventil\u00e1torov\u00e9 motory v komer\u010dn\u00ed\/pr\u016fmyslov\u00e9 klimatizaci<\/li>\n<\/ul>\n<p>aM se specifikuje v\u0161ude tam, kde se motory spou\u0161t\u011bj\u00ed p\u0159\u00edmo (ne soft-startem nebo \u0159\u00edzen\u00edm VFD) a spou\u0161t\u011bc\u00ed proud by zp\u016fsobil obt\u011b\u017euj\u00edc\u00ed vyp\u00edn\u00e1n\u00ed gG.<\/p>\n<h3>Koordina\u010dn\u00ed po\u017eadavky<\/h3>\n<p>Proto\u017ee pojistky aM poskytuj\u00ed pouze ochranu proti zkratu, <strong>koordinace s nadproudov\u00fdmi za\u0159\u00edzen\u00edmi je povinn\u00e1<\/strong>. Kompletn\u00ed sch\u00e9ma ochrany motoru obvykle zahrnuje:<\/p>\n<ol>\n<li><strong>Pojistka aM<\/strong>: Ochrana proti zkratu (odstran\u011bn\u00ed poruchy)<\/li>\n<li><strong>Tepeln\u00e9 nadproudov\u00e9 rel\u00e9 nebo motorov\u00fd jisti\u010d<\/strong>: Ochrana proti p\u0159et\u00ed\u017een\u00ed (trval\u00fd nadproud z mechanick\u00e9ho p\u0159et\u00ed\u017een\u00ed, jednof\u00e1zov\u00e9ho chodu atd.)<\/li>\n<li><strong>Styka\u010d<\/strong>: Sp\u00ednac\u00ed za\u0159\u00edzen\u00ed pro ovl\u00e1d\u00e1n\u00ed start\/stop<\/li>\n<\/ol>\n<p>Koordinace mus\u00ed zajistit, aby nadproudov\u00e9 za\u0159\u00edzen\u00ed vypnulo d\u0159\u00edve, ne\u017e pojistka vyp\u00e1l\u00ed b\u011bhem p\u0159et\u00ed\u017een\u00ed, zat\u00edmco pojistka vypne d\u0159\u00edve, ne\u017e se nadproudov\u00e9 za\u0159\u00edzen\u00ed nebo styka\u010d po\u0161kod\u00ed b\u011bhem zkratov\u00fdch poruch. To vy\u017eaduje porovn\u00e1n\u00ed \u010dasov\u011b-proudov\u00fdch charakteristik a ov\u011b\u0159en\u00ed, \u017ee vyp\u00ednac\u00ed charakteristika nadproudov\u00e9ho za\u0159\u00edzen\u00ed le\u017e\u00ed zcela pod tavnou charakteristikou pojistky v oblasti p\u0159et\u00ed\u017een\u00ed.<\/p>\n<h3>Krit\u00e9ria v\u00fdb\u011bru<\/h3>\n<p>Specifikujte aM, kdy\u017e:<\/p>\n<ul>\n<li>Chr\u00e1n\u00edte motorov\u00e9 obvody s p\u0159\u00edm\u00fdm spou\u0161t\u011bn\u00edm<\/li>\n<li>Spou\u0161t\u011bc\u00ed proud motoru by zp\u016fsobil obt\u011b\u017euj\u00edc\u00ed vyp\u00edn\u00e1n\u00ed pojistek gG<\/li>\n<li>V \u0159\u00eddic\u00edm sch\u00e9matu je zaji\u0161t\u011bna samostatn\u00e1 tepeln\u00e1 ochrana proti p\u0159et\u00ed\u017een\u00ed<\/li>\n<li>Aplikace odpov\u00edd\u00e1 pr\u016fmyslov\u00e9mu motorov\u00e9mu provozu podle IEC 60269-2<\/li>\n<\/ul>\n<p><strong>Nepou\u017e\u00edvejte aM<\/strong> pro v\u0161eobecn\u00e9 distribu\u010dn\u00ed obvody (bez ochrany proti p\u0159et\u00ed\u017een\u00ed), pro kabely\/nap\u00e1je\u010de vy\u017eaduj\u00edc\u00ed plnohodnotnou ochranu (pou\u017eijte gG) nebo tam, kde mus\u00ed b\u00fdt ochrana motoru zaji\u0161t\u011bna pouze pojistkou (pou\u017eijte m\u00edsto toho motorov\u00e9 jisti\u010de).<\/p>\n<h2>T\u0159\u00edda gPV: Fotovoltaick\u00e9 pojistky<\/h2>\n<p><strong>gPV<\/strong> pojistky jsou speci\u00e1ln\u011b navr\u017eeny pro ochranu sol\u00e1rn\u00edch fotovoltaick\u00fdch energetick\u00fdch syst\u00e9m\u016f, kter\u00e9 se \u0159\u00edd\u00ed dopl\u0148kov\u00fdmi po\u017eadavky IEC 60269-6. Ozna\u010den\u00ed se rozpad\u00e1 na <strong>g<\/strong> (pln\u00fd rozsah, pokr\u00fdvaj\u00edc\u00ed p\u0159et\u00ed\u017een\u00ed a zkrat) + <strong>PV<\/strong> (fotovoltaick\u00e9 syst\u00e9my). Tyto pojistky \u0159e\u0161\u00ed jedine\u010dn\u00e9 v\u00fdzvy ochrany DC obvod\u016f v sol\u00e1rn\u00edch instalac\u00edch \u2013 v\u00fdzvy, kter\u00e9 \u010din\u00ed standardn\u00ed pojistky s AC jmenovit\u00fdm proudem nedostate\u010dn\u00fdmi a potenci\u00e1ln\u011b nebezpe\u010dn\u00fdmi.<\/p>\n<h3>Pro\u010d fotovoltaick\u00e9 syst\u00e9my vy\u017eaduj\u00ed specializovan\u00e9 pojistky<\/h3>\n<p>DC obvody se chovaj\u00ed z\u00e1sadn\u011b odli\u0161n\u011b ne\u017e AC b\u011bhem p\u0159eru\u0161en\u00ed poruchy:<\/p>\n<ul>\n<li><strong>\u017d\u00e1dn\u00e1 p\u0159irozen\u00e1 proudov\u00e1 nula<\/strong>: AC proud p\u0159ekra\u010duje nulu 100 nebo 120kr\u00e1t za sekundu (50 Hz nebo 60 Hz syst\u00e9my), co\u017e poskytuje p\u0159irozen\u00e9 body zh\u00e1\u0161en\u00ed oblouku, kdy\u017e pojistka vyp\u00e1l\u00ed. DC proud je kontinu\u00e1ln\u00ed \u2013 neexistuje \u017e\u00e1dn\u00fd pr\u016fchod nulou. Pojistka mus\u00ed aktivn\u011b vynutit zh\u00e1\u0161en\u00ed oblouku prost\u0159ednictv\u00edm fyzick\u00e9 konstrukce.<\/li>\n<li><strong>Vysok\u00e1 provozn\u00ed nap\u011bt\u00ed<\/strong>: Modern\u00ed fotovoltaick\u00e9 stringy v m\u011b\u0159\u00edtku utility pracuj\u00ed s DC nap\u011bt\u00edm a\u017e 1 500 V, co\u017e je mnohem vy\u0161\u0161\u00ed ne\u017e typick\u00e1 AC distribu\u010dn\u00ed nap\u011bt\u00ed.<\/li>\n<li><strong>Sc\u00e9n\u00e1\u0159e zp\u011btn\u00e9ho proudu<\/strong>: V konfigurac\u00edch string\u016f\/pol\u00ed, pokud se v jednom stringu vyvine porucha, jin\u00e9 paraleln\u00ed stringy mohou zp\u011btn\u011b nap\u00e1jet proud do poruchy p\u0159es pojistku posti\u017een\u00e9ho stringu.<\/li>\n<li><strong>Expozice prost\u0159ed\u00ed<\/strong>: Fotovoltaick\u00e9 pojistky v kombin\u00e1torov\u00fdch boxech jsou \u010dasto instalov\u00e1ny venku, vystaveny extr\u00e9mn\u00edm teplot\u00e1m, UV z\u00e1\u0159en\u00ed a vlhkosti.<\/li>\n<\/ul>\n<p>Z t\u011bchto d\u016fvod\u016f, <strong>pou\u017e\u00edv\u00e1n\u00ed AC pojistek gG nebo aM v DC fotovoltaick\u00fdch obvodech je nebezpe\u010dn\u00e9<\/strong>. Pouze pojistky gPV spl\u0148uj\u00edc\u00ed IEC 60269-6 poskytuj\u00ed ov\u011b\u0159en\u00fd v\u00fdkon p\u0159eru\u0161en\u00ed DC.<\/p>\n<h3>Charakteristiky a \u010dasov\u011b-proudov\u00e9 chov\u00e1n\u00ed<\/h3>\n<p>Pojistky gPV poskytuj\u00ed plnohodnotnou ochranu podobnou gG, ale optimalizovanou pro fotovoltaick\u00e9 provozn\u00ed prost\u0159ed\u00ed:<\/p>\n<ul>\n<li><strong>Ochrana kabel\u016f a string\u016f<\/strong>: \u010casov\u011b-proudov\u00e1 charakteristika chr\u00e1n\u00ed fotovoltaick\u00e9 kabely a kabel\u00e1\u017e string\u016f p\u0159ed p\u0159et\u00ed\u017een\u00edm a poruchov\u00fdmi stavy.<\/li>\n<li><strong>Vyp\u00ednac\u00ed schopnost s DC jmenovit\u00fdm proudem<\/strong>: Ov\u011b\u0159eno testov\u00e1n\u00edm p\u0159eru\u0161en\u00ed DC podle IEC 60269-6, s potvrzen\u00fdm v\u00fdkonem p\u0159i syst\u00e9mov\u00e9m nap\u011bt\u00ed (a\u017e 1 500 V DC).<\/li>\n<li><strong>Jmenovit\u00e9 pro fotovoltaick\u00e9 pracovn\u00ed cykly<\/strong>: Fotovoltaick\u00e9 syst\u00e9my za\u017e\u00edvaj\u00ed jedine\u010dn\u00e9 profily zat\u00ed\u017een\u00ed \u2013 denn\u00ed v\u00fdroba s proudem z\u00e1visl\u00fdm na teplot\u011b, no\u010dn\u00ed klid a p\u0159echodn\u00e9 efekty okraje oblaku.<\/li>\n<\/ul>\n<h3>Rozd\u00edly ve fyzick\u00e9 konstrukci<\/h3>\n<p>Ve srovn\u00e1n\u00ed s ekvivalentn\u00edmi AC pojistkami jsou pojistky gPV obvykle:<\/p>\n<ul>\n<li><strong>Del\u0161\u00ed<\/strong>: Zv\u00fd\u0161en\u00e1 d\u00e9lka poskytuje v\u011bt\u0161\u00ed vzd\u00e1lenost pro p\u0159eru\u0161en\u00ed oblouku.<\/li>\n<li><strong>Specializovan\u00fd v\u00fdpl\u0148ov\u00fd materi\u00e1l<\/strong>: Vylep\u0161en\u00fd p\u00edsek pro zh\u00e1\u0161en\u00ed oblouku nebo jin\u00e9 dielektrick\u00e9 materi\u00e1ly pro potla\u010den\u00ed DC oblouk\u016f.<\/li>\n<li><strong>Vy\u0161\u0161\u00ed jmenovit\u00e9 nap\u011bt\u00ed<\/strong>: V\u00fdslovn\u011b jmenovit\u00e9 pro DC provoz a\u017e do 1 000 V nebo 1 500 V.<\/li>\n<\/ul>\n<h3>Typick\u00e9 aplikace v sol\u00e1rn\u00edch instalac\u00edch<\/h3>\n<ul>\n<li><strong>Ochrana string\u016f<\/strong>: Jednotliv\u00e9 pojistky chr\u00e1n\u00edc\u00ed ka\u017ed\u00fd fotovoltaick\u00fd string v kombin\u00e1torov\u00fdch boxech.<\/li>\n<li><strong>Hlavn\u00ed ochrana pole<\/strong>: Hlavn\u00ed pojistky na v\u00fdstupech kombin\u00e1torov\u00fdch box\u016f nap\u00e1jej\u00edc\u00edch st\u0159\u00edda\u010de.<\/li>\n<li><strong>DC kombin\u00e1tor\/distribuce<\/strong>: Ochrana DC kabel\u016f a distribu\u010dn\u00edho za\u0159\u00edzen\u00ed mezi poli a st\u0159\u00edda\u010di.<\/li>\n<li><strong>Ostrovn\u00ed a bateriov\u00e9 syst\u00e9my<\/strong>: Ochrana DC obvod\u016f v samostatn\u00fdch sol\u00e1rn\u00edch instalac\u00edch.<\/li>\n<\/ul>\n<h3>Krit\u00e9ria v\u00fdb\u011bru<\/h3>\n<p>Specifikujte gPV, kdy\u017e:<\/p>\n<ul>\n<li>Chr\u00e1n\u00edte DC obvody ve fotovoltaick\u00fdch syst\u00e9mech<\/li>\n<li>Pracujete s DC nap\u011bt\u00edm od 100 V do 1 500 V<\/li>\n<li>Chr\u00e1n\u00edte stringy\/pole v sol\u00e1rn\u00edch instalac\u00edch p\u0159ipojen\u00fdch k s\u00edti nebo ostrovn\u00edch<\/li>\n<li>Jak\u00e1koli aplikace, kde je vy\u017eadov\u00e1no p\u0159eru\u0161en\u00ed DC proudu ve fotovoltaick\u00e9 oblasti<\/li>\n<\/ul>\n<p><strong>Nepou\u017e\u00edvejte gG nebo aM<\/strong> (Pojistky s AC jmenovit\u00fdm proudem) v PV DC obvodech \u2013 nemaj\u00ed schopnost p\u0159eru\u0161it DC proud a p\u0159edstavuj\u00ed bezpe\u010dnostn\u00ed rizika. V\u017edy ov\u011b\u0159te, zda je pojistka v\u00fdslovn\u011b ur\u010dena pro DC provoz p\u0159i nap\u011bt\u00ed syst\u00e9mu.<\/p>\n<h2>Kl\u00ed\u010dov\u00e9 technick\u00e9 rozd\u00edly mezi gG, aM a gPV<\/h2>\n<table>\n<tbody>\n<tr>\n<td>\u00darove\u0148 proudu<\/td>\n<td>Chov\u00e1n\u00ed gG<\/td>\n<td>Chov\u00e1n\u00ed aM<\/td>\n<td>Chov\u00e1n\u00ed gPV<\/td>\n<\/tr>\n<tr>\n<td>1,5\u00d7In (p\u0159et\u00ed\u017een\u00ed)<\/td>\n<td>P\u0159ep\u00e1l\u00ed se za 1\u20134 hodiny<\/td>\n<td>Toleruje neomezen\u011b<\/td>\n<td>P\u0159ep\u00e1l\u00ed se za 1\u20134 hodiny<\/td>\n<\/tr>\n<tr>\n<td>5\u00d7In (trval\u00e9 p\u0159et\u00ed\u017een\u00ed)<\/td>\n<td>P\u0159ep\u00e1l\u00ed se za 2\u20135 sekund<\/td>\n<td>Toleruje nebo pomal\u00e1 odezva<\/td>\n<td>P\u0159ep\u00e1l\u00ed se za 2\u20135 sekund<\/td>\n<\/tr>\n<tr>\n<td>10\u00d7In (zkrat)<\/td>\n<td>P\u0159ep\u00e1l\u00ed se za 0,1\u20130,2 sekundy<\/td>\n<td>P\u0159ep\u00e1l\u00ed se za 0,1\u20130,2 sekundy<\/td>\n<td>P\u0159ep\u00e1l\u00ed se za 0,1\u20130,2 sekundy<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>K\u0159ivky ukazuj\u00ed, \u017ee gG a gPV pracuj\u00ed v cel\u00e9m spektru, zat\u00edmco aM \u201cignoruje\u201d oblast p\u0159et\u00ed\u017een\u00ed, aby umo\u017enila spou\u0161t\u011bn\u00ed motoru.<\/p>\n<h2>Praktick\u00fd pr\u016fvodce v\u00fdb\u011brem: P\u0159i\u0159azen\u00ed t\u0159\u00eddy pojistky k aplikaci<\/h2>\n<h3>Krok 1: Identifikujte typ z\u00e1t\u011b\u017ee a elektrick\u00e9 charakteristiky<\/h3>\n<ul>\n<li><strong>Kabely, p\u0159\u00edvody, obecn\u00e9 distribu\u010dn\u00ed obvody<\/strong> s odporovou nebo sm\u00ed\u0161enou z\u00e1t\u011b\u017e\u00ed \u2192 Zva\u017ete gG<\/li>\n<li><strong>Obvody motoru<\/strong> s p\u0159\u00edm\u00fdm spou\u0161t\u011bn\u00edm a vysok\u00fdm z\u00e1b\u011brov\u00fdm proudem \u2192 Zva\u017ete aM<\/li>\n<li><strong>Fotovoltaick\u00e9 DC obvody<\/strong> v sol\u00e1rn\u00edch instalac\u00edch \u2192 Vy\u017eaduj\u00ed gPV<\/li>\n<li><strong>Polovodi\u010dov\u00e1 za\u0159\u00edzen\u00ed<\/strong> (usm\u011br\u0148ova\u010de, tyristory, st\u0159\u00edda\u010de) \u2192 Zva\u017ete gR\/aR<\/li>\n<\/ul>\n<h3>Krok 2: Vypo\u010d\u00edtejte ust\u00e1len\u00e9 a p\u0159echodn\u00e9 proudy<\/h3>\n<p>Vypo\u010d\u00edtejte zat\u011b\u017eovac\u00ed proudy a n\u00e1b\u011bh (spou\u0161t\u011bn\u00ed motoru atd.). Pro motory pou\u017eijte pojistky aM dimenzovan\u00e9 na 1,5\u20132,5\u00d7FLC, aby vydr\u017eely spou\u0161t\u011bn\u00ed. Pro obecn\u00e9 obvody p\u0159i\u0159a\u010fte gG k proudov\u00e9 zat\u00ed\u017eitelnosti kabelu.<\/p>\n<h3>Krok 3: Ov\u011b\u0159te nap\u011bt\u00ed a vyp\u00ednac\u00ed schopnost<\/h3>\n<p>Zajist\u011bte, aby jmenovit\u00e9 nap\u011bt\u00ed (AC vs DC) a vyp\u00ednac\u00ed schopnost (Icn\/Icu) p\u0159ekra\u010dovaly parametry syst\u00e9mu.<\/p>\n<h3>Krok 4: Zkontrolujte koordinaci a selektivitu<\/h3>\n<p>Pou\u017eijte pravidlo 1,6\u00d7 pro selektivitu gG. Koordinujte pojistky aM s nadproudov\u00fdmi rel\u00e9.<\/p>\n<h3>B\u011b\u017en\u00e9 sc\u00e9n\u00e1\u0159e v\u00fdb\u011bru<\/h3>\n<p><strong>Sc\u00e9n\u00e1\u0159 1: 50 kW \/ 400V t\u0159\u00edf\u00e1zov\u00fd distribu\u010dn\u00ed p\u0159\u00edvod<\/strong>: Z\u00e1t\u011b\u017e je sm\u00ed\u0161en\u00e1 distribuce \u2192 Pou\u017eijte <strong>gG<\/strong>.<\/p>\n<p><strong>Sc\u00e9n\u00e1\u0159 2: 22 kW \/ 400V t\u0159\u00edf\u00e1zov\u00fd induk\u010dn\u00ed motor, DOL start<\/strong>: Vysok\u00fd z\u00e1b\u011brov\u00fd proud \u2192 Pou\u017eijte <strong>aM<\/strong> + Nadproudov\u00e9 rel\u00e9.<\/p>\n<p><strong>Sc\u00e9n\u00e1\u0159 3: Sol\u00e1rn\u00ed FV string, 450V DC<\/strong>: DC obvod s rizikem zp\u011btn\u00e9ho proudu \u2192 Pou\u017eijte <strong>gPV<\/strong>.<\/p>\n<h2>Z\u00e1v\u011br<\/h2>\n<p>Kategorie vyu\u017eit\u00ed IEC 60269 \u2013 gG, aM a gPV \u2013 poskytuj\u00ed systematick\u00fd r\u00e1mec pro klasifikaci n\u00edzkonap\u011b\u0165ov\u00fdch pojistek podle jejich zam\u00fd\u0161len\u00e9ho pou\u017eit\u00ed a provozn\u00edch charakteristik. Tato ozna\u010den\u00ed nejsou marketingov\u00e9 term\u00edny; definuj\u00ed ov\u011b\u0159en\u00e9 po\u017eadavky na v\u00fdkon testovan\u00e9 a dokumentovan\u00e9 v mezin\u00e1rodn\u00ed norm\u011b.<\/p>\n<p><strong>gG (univerz\u00e1ln\u00ed)<\/strong> pojistky poskytuj\u00ed plnou ochranu kabel\u016f, p\u0159\u00edvod\u016f a distribu\u010dn\u00edch obvod\u016f, pokr\u00fdvaj\u00edc\u00ed p\u0159et\u00ed\u017een\u00ed a\u017e po zkrat. Jsou v\u00fdchoz\u00ed volbou pro v\u011bt\u0161inu aplikac\u00ed elektrick\u00e9 distribuce v dom\u00e1cnostech a pr\u016fmyslov\u00fdch za\u0159\u00edzen\u00edch.<\/p>\n<p><strong>aM (ochrana motoru)<\/strong> pojistky nab\u00edzej\u00ed \u010d\u00e1ste\u010dnou ochranu ur\u010denou speci\u00e1ln\u011b pro motorov\u00e9 obvody, toleruj\u00edc\u00ed vysok\u00e9 z\u00e1b\u011brov\u00e9 proudy p\u0159i spou\u0161t\u011bn\u00ed a z\u00e1rove\u0148 odstra\u0148uj\u00edc\u00ed zkratov\u00e9 poruchy. Mus\u00ed b\u00fdt sp\u00e1rov\u00e1ny se samostatnou tepelnou ochranou proti p\u0159et\u00ed\u017een\u00ed, aby vytvo\u0159ily kompletn\u00ed sch\u00e9ma ochrany motoru.<\/p>\n<p><strong>gPV (fotovoltaick\u00e9)<\/strong> pojistky \u0159e\u0161\u00ed jedine\u010dn\u00e9 po\u017eadavky DC sol\u00e1rn\u00edch syst\u00e9m\u016f \u2013 prodlou\u017een\u00e1 t\u011bla pojistek a specializovan\u00e9 materi\u00e1ly pro zh\u00e1\u0161en\u00ed oblouku pro p\u0159eru\u0161en\u00ed DC proud\u016f bez p\u0159irozen\u00fdch pr\u016fchod\u016f nulou, jmenovit\u00e9 pro DC nap\u011bt\u00ed a\u017e 1 500 V.<\/p>\n<p>Pro elektroin\u017een\u00fdry, v\u00fdrobce rozvad\u011b\u010d\u016f a pracovn\u00edky \u00fadr\u017eby je pochopen\u00ed t\u011bchto rozd\u00edl\u016f z\u00e1sadn\u00ed pro spolehliv\u00fd provoz syst\u00e9mu. Nespr\u00e1vn\u00e9 pou\u017eit\u00ed vytv\u00e1\u0159\u00ed p\u0159edv\u00eddateln\u00e9 d\u016fsledky: pojistky gG v motorov\u00e9m provozu zp\u016fsobuj\u00ed ru\u0161iv\u00e9 vyp\u00edn\u00e1n\u00ed; pojistky aM v distribu\u010dn\u00edch obvodech poskytuj\u00ed nedostate\u010dnou ochranu proti p\u0159et\u00ed\u017een\u00ed; pojistky s AC jmenovit\u00fdm proudem v DC PV obvodech riskuj\u00ed katastrof\u00e1ln\u00ed selh\u00e1n\u00ed p\u0159eru\u0161en\u00ed.<\/p>\n<p>Spr\u00e1vn\u00fd v\u00fdb\u011br vy\u017eaduje anal\u00fdzu charakteristik z\u00e1t\u011b\u017ee (odporov\u00e1\/motorov\u00e1\/DC), v\u00fdpo\u010det ust\u00e1len\u00fdch a p\u0159echodn\u00fdch proud\u016f, ov\u011b\u0159en\u00ed jmenovit\u00e9ho nap\u011bt\u00ed a vyp\u00ednac\u00ed schopnosti, zaji\u0161t\u011bn\u00ed koordinace s ostatn\u00edmi ochrann\u00fdmi za\u0159\u00edzen\u00edmi a zohledn\u011bn\u00ed podm\u00ednek prost\u0159ed\u00ed. Dvoup\u00edsmenn\u00fd k\u00f3d kategorie vyu\u017eit\u00ed na ka\u017ed\u00e9 pojistce IEC 60269 definuje testovan\u00fd provoz a podm\u00ednky, za kter\u00fdch plat\u00ed publikovan\u00e9 hodnoty.<\/p>\n<p>Spole\u010dnost VIOX Electric vyr\u00e1b\u00ed n\u00edzkonap\u011b\u0165ov\u00e9 pojistky navr\u017een\u00e9 podle norem IEC 60269 v t\u0159\u00edd\u00e1ch gG, aM a gPV, s komplexn\u00ed technickou dokumentac\u00ed a aplika\u010dn\u00ed podporou. Pro z\u00edsk\u00e1n\u00ed pokyn\u016f ke specifikaci, studi\u00ed koordinace nebo technick\u00e9 konzultace ohledn\u011b va\u0161ich po\u017eadavk\u016f na nadproudovou ochranu kontaktujte in\u017een\u00fdrsk\u00fd t\u00fdm spole\u010dnosti VIOX.<\/p>\n<p><strong>Specifikujte spr\u00e1vnou t\u0159\u00eddu pojistky pro spolehlivou ochranu.<\/strong> <strong><a href=\"https:\/\/test.viox.com\/cs\/contact\/\">Kontakt VIOX Electric<\/a><\/strong> <strong>pro projedn\u00e1n\u00ed va\u0161ich po\u017eadavk\u016f na pojistky IEC 60269.<\/strong><\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Figure 1: IEC 60269 low-voltage fuses are classified by utilization categories (gG, aM, gPV) that define their intended application and operational characteristics. VIOX Electric manufactures fuses engineered to IEC 60269 standards for industrial, motor protection, and photovoltaic applications. When you open a fuse supplier&#8217;s catalog or inspect a fuse marking in an industrial panel, you&#8217;ll [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":20623,"comment_status":"closed","ping_status":"closed","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-20620","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\/20620","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=20620"}],"version-history":[{"count":3,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/posts\/20620\/revisions"}],"predecessor-version":[{"id":20624,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/posts\/20620\/revisions\/20624"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/media\/20623"}],"wp:attachment":[{"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/media?parent=20620"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/categories?post=20620"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/tags?post=20620"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}