{"id":4275,"date":"2026-09-16T18:24:56","date_gmt":"2026-09-16T18:24:56","guid":{"rendered":"https:\/\/huyuglobal.com\/?p=4275"},"modified":"2026-09-16T18:26:33","modified_gmt":"2026-09-16T18:26:33","slug":"curve-breaker-definition","status":"publish","type":"post","link":"https:\/\/huyuglobal.com\/tr\/blog\/curve-breaker-definition\/","title":{"rendered":"E\u011fri Kesici Tan\u0131m\u0131: B, C ve D Trip E\u011frileri Ger\u00e7ekte Ne Anlama Gelir"},"content":{"rendered":"<p>Bir e\u011fri kesici yeni bir kesici t\u00fcr\u00fc olmayabilir ancak devrenin her motor a\u00e7\u0131ld\u0131\u011f\u0131nda atmas\u0131n\u0131 veya bir tel yanarken kapal\u0131 kalmas\u0131n\u0131 sa\u011flayan \u00f6nceden ayarlanm\u0131\u015f bir e\u011fri taraf\u0131ndan belirlenen atma s\u00fcresine sahip bir kesici anlam\u0131na gelir. Ba\u015fl\u0131k ak\u0131mla ilgili olmad\u0131\u011f\u0131 i\u00e7in yanl\u0131\u015f anla\u015f\u0131lmas\u0131 kolayd\u0131r, bunun yerine kesicinin belirli bir nominal ak\u0131m oran\u0131na tepki h\u0131z\u0131yla ilgilidir. Bu nedenle amperaj de\u011feri ne olursa olsun, yanl\u0131\u015f e\u011friyi k\u0131rmak soruna \u00e7\u00f6z\u00fcm olmad\u0131\u011f\u0131 anlam\u0131na gelir; bu y\u00fczden ayn\u0131 can s\u0131k\u0131c\u0131 atma, bir m\u00fchendisin daha b\u00fcy\u00fck bir kesici aramas\u0131na neden olurken, sadece ad\u0131ndaki bir harfin de\u011fi\u015ftirilmesiyle kolayca \u00e7\u00f6z\u00fclebilir. Bu k\u0131lavuz, atma e\u011frisinin tan\u0131m\u0131n\u0131 sa\u011flar, e\u011friler ve atma seviyeleri hakk\u0131nda a\u00e7\u0131klamalar verir ve neden do\u011fru se\u00e7ilmelerinin gerekli oldu\u011funu a\u00e7\u0131klar.<\/p>\n<blockquote><p>\u00d6zetlemek gerekirse, bir e\u011fri kesici, standart e\u011friler (B, C veya D ile etiketlenmi\u015f) kullanan belirli bir devre kesici t\u00fcr\u00fcd\u00fcr; her e\u011fri, manyetik atma valfinin ayar\u0131n\u0131 g\u00f6steren zaman-ak\u0131m atma karakteristi\u011fini g\u00f6sterir. Farkl\u0131 devre kesici t\u00fcrlerinin In ak\u0131m\u0131na dayal\u0131 farkl\u0131 atma ayarlar\u0131 vard\u0131r. E\u011fri kesicinin atma ak\u0131m\u0131, IEC\/EN 60898-1 standard\u0131na g\u00f6re a\u015fa\u011f\u0131daki tabloda tan\u0131mlanm\u0131\u015ft\u0131r; B tipi kesici 3 ila 5 kat In\u2019de, C tipi 5 ila 10 kat In\u2019de ve D tipi 10 ila 20 kat In\u2019de atmal\u0131d\u0131r. Termal karakteristikler t\u00fcm 3 kesici t\u00fcr\u00fc i\u00e7in ayn\u0131d\u0131r; ancak anl\u0131k atma ak\u0131m\u0131 farkl\u0131d\u0131r. B\u00f6ylece, \u00f6rne\u011fin, B tipi kesiciler d\u00fc\u015f\u00fck giri\u015f ak\u0131m\u0131na sahip elektronik y\u00fcklerle kullan\u0131labilir, C tipi kesici kar\u0131\u015f\u0131k tip y\u00fckler ve normal motorlarla kullan\u0131labilir ve son olarak D tipi kesici a\u011f\u0131r giri\u015f ekipmanlar\u0131 i\u00e7in tasarlanm\u0131\u015ft\u0131r.<\/p><\/blockquote>\n<h2>\u201cE\u011fri Kesici\u201d Ne Anlama Gelir<\/h2>\n<p>Bu ifade, anahtar\u0131n\u0131 atma zaman\u0131n\u0131n tek bir noktas\u0131 yerine \u00f6nceden ayarlanm\u0131\u015f bir zaman-ak\u0131m karakteristi\u011fine g\u00f6re \u00e7al\u0131\u015fan bir devre kesici t\u00fcr\u00fcn\u00fc tan\u0131mlar. Her termal manyetik minyat\u00fcr devre kesicinin kendi \u201ce\u011frisi\u201d vard\u0131r. \u201cE\u011fri\u201d, bu ekipman\u0131n \u00e7e\u015fitli ak\u0131mlara maruz kald\u0131\u011f\u0131nda nas\u0131l davrand\u0131\u011f\u0131n\u0131 tan\u0131mlayan terimin ad\u0131d\u0131r.<\/p>\n<p>Bu s\u00fcre\u00e7ten sorumlu iki mekanizma vard\u0131r. Birincisi, i\u00e7inden ge\u00e7en ak\u0131mla \u0131s\u0131nan bimetalik bir \u015ferit olan termal cihazd\u0131r. A\u015f\u0131r\u0131 y\u00fck olu\u015fursa, \u015ferit yava\u015f yava\u015f b\u00fck\u00fcl\u00fcr ve atar; b\u00f6ylece hem kablolaman\u0131n yava\u015f a\u015f\u0131r\u0131 \u0131s\u0131nmas\u0131na kar\u015f\u0131 koruyucu bir anlam ta\u015f\u0131r hem de a\u015f\u0131r\u0131 y\u00fck artt\u0131k\u00e7a h\u0131zlanan ancak anl\u0131k olmayan ters zaman e\u011frisi olarak adland\u0131r\u0131lan bir e\u011friye g\u00f6re \u00e7al\u0131\u015f\u0131r. \u0130kinci mekanizma, ak\u0131m artt\u0131k\u00e7a devreye uygulanan kuvveti art\u0131ran manyetik cihaz veya solenoiddir. \u0130\u015fte e\u011frinin anl\u0131k k\u0131sm\u0131 b\u00f6yle elde edilir.<\/p>\n<p>Her iki mekanizma da ayn\u0131 kontak mekanizmas\u0131 i\u00e7in kullan\u0131ld\u0131\u011f\u0131ndan, \u201ce\u011fri\u201d bu iki mekanizman\u0131n birlikte nas\u0131l davrand\u0131\u011f\u0131n\u0131 temsil eder: termal cihaz\u0131n \u00e7al\u0131\u015ft\u0131\u011f\u0131 d\u00fc\u015f\u00fck ak\u0131m de\u011ferlerinde d\u00fczg\u00fcn ters-zaman e\u011fimi ve manyetik cihaz kontrol\u00fc ele ald\u0131\u011f\u0131nda e\u011frinin bu k\u0131sm\u0131nda neredeyse dik azalma. E\u011frinin dikle\u015fti\u011fi nokta, harfiyle tan\u0131mlanan de\u011ferdir. Bu prensiple \u00fcretilen cihazlar ve ait olduklar\u0131 aileler, rehberimizde ele al\u0131nm\u0131\u015ft\u0131r. <a href=\"https:\/\/huyuglobal.com\/tr\/blog\/what-is-mccb-and-mcb\/\">MCB ve MCCB se\u00e7imi<\/a>.<\/p>\n<p>Pratik anlamda, e\u011fri bir kalite veya ak\u0131m derecesini temsil etmez. Hem Tip B kesici 20A hem de Tip D kesici 20A, 20A ta\u015f\u0131yarak 20A devresini korur. \u0130ki kesici aras\u0131ndaki tek fark, k\u0131sa s\u00fcreli ne kadar ak\u0131m\u0131 tolere edebildikleridir.<\/p>\n<h2>Bir Kesme E\u011frisinin Anatomisi<\/h2>\n<p>Bir kesme e\u011frisi log-log eksenleri kullan\u0131larak temsil edilir. Yatay eksen, nominal ak\u0131m\u0131n oran\u0131 olarak ak\u0131m\u0131 g\u00f6sterir; yani I\/In. Dikey eksen ise binlerce saniyeden milisaniyelere kadar saniye cinsinden kesme s\u00fcresidir.<\/p>\n<table>\n<tbody>\n<tr>\n<th>E\u011fri B\u00f6lgesi<\/th>\n<th>Ak\u0131m Aral\u0131\u011f\u0131<\/th>\n<th>Mekanizma<\/th>\n<th>Ne t\u00fcr koruma sa\u011flad\u0131\u011f\u0131<\/th>\n<\/tr>\n<tr>\n<td>Kesme olmayan b\u00f6lge<\/td>\n<td>Yakla\u015f\u0131k 1.13 \u00d7 I\u2019ye kadar<sub>n<\/sub><\/td>\n<td>Hi\u00e7bir eleman \u00e7al\u0131\u015fmaz<\/td>\n<td>\u2014 normal y\u00fck ak\u0131m\u0131<\/td>\n<\/tr>\n<tr>\n<td>Belirsiz termal bant<\/td>\n<td>13-1.45 \u00d7 I<sub>n<\/sub><\/td>\n<td>Termal; belirtilen s\u00fcre i\u00e7inde kesme olabilir veya olmayabilir<\/td>\n<td>Marjinal a\u015f\u0131r\u0131 y\u00fck<\/td>\n<\/tr>\n<tr>\n<td>Kesin termal kesme<\/td>\n<td>45 \u00d7 I\u2019nin \u00fczerinde<sub>n<\/sub><\/td>\n<td>Termal, ters zamanl\u0131<\/td>\n<td>Kablo a\u015f\u0131r\u0131 y\u00fck\u00fc ve a\u015f\u0131r\u0131 \u0131s\u0131nma<\/td>\n<\/tr>\n<tr>\n<td>Manyetik ge\u00e7i\u015f<\/td>\n<td>3-5\u00d7 (B), 5-10\u00d7 (C), 10-20\u00d7 (D)<\/td>\n<td>Manyetik, anl\u0131k<\/td>\n<td>K\u0131sa devre ve y\u00fcksek giri\u015f ay\u0131r\u0131m\u0131<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Tablo verilerine g\u00fcvenlik a\u00e7\u0131s\u0131ndan bakmak yerine, bunlar bir ay\u0131r\u0131m hikayesi olarak ele al\u0131nmal\u0131d\u0131r. Termal b\u00f6lge her e\u011fri i\u00e7in tam olarak ayn\u0131d\u0131r \u00e7\u00fcnk\u00fc kablo korumas\u0131, y\u00fck t\u00fcr\u00fc ne olursa olsun ortak bir konudur. Manyetik b\u00f6lgede ise cihaz\u0131n d\u00fc\u015f\u00fck ak\u0131m durumunda hassas ekipman\u0131n korunmas\u0131 i\u00e7in kesip kesmemesi, ancak kabul edilebilir t\u00fcm giri\u015f ak\u0131mlar\u0131n\u0131n g\u00f6z ard\u0131 edilmesi ya da tam tersi \u2013 t\u00fcm giri\u015f ak\u0131mlar\u0131na izin vererek cihaz\u0131n ger\u00e7ek a\u015f\u0131r\u0131 ak\u0131m ar\u0131zalar\u0131na daha yava\u015f tepki vermesi \u00fcreticinin karar\u0131na ba\u011fl\u0131d\u0131r. E\u011frinin harfi bu se\u00e7imin kayd\u0131d\u0131r.<\/p>\n<p>\u00d6nemli bir nokta a\u00e7\u0131k\u00e7a belirtilmelidir \u00e7\u00fcnk\u00fc e\u011fri se\u00e7imi konusunun pratik \u00f6nemini g\u00f6sterir. Giri\u015f ak\u0131m\u0131 ger\u00e7ek ve olduk\u00e7a normal bir fenomendir. Yayg\u0131n bir AC end\u00fcksiyon motoru, \u00e7al\u0131\u015fmaya ba\u015flad\u0131ktan hemen sonra nominal ak\u0131m\u0131n\u0131n be\u015f ila sekiz kat\u0131n\u0131 \u00e7ok k\u0131sa bir s\u00fcre i\u00e7in \u00e7eker. Bir trafo \u015febekeye ba\u011fland\u0131\u011f\u0131nda, ilk d\u00f6ng\u00fclerde nominal ak\u0131m\u0131n\u0131n on ila on d\u00f6rt kat\u0131n\u0131 t\u00fcketebilir. Ak\u0131m de\u011feri bu okumalardan herhangi birinden d\u00fc\u015f\u00fckse, ar\u0131za olmasa bile cihaz her seferinde keser. Ayn\u0131 mant\u0131k, anahtarlama yapan ancak ar\u0131za giderimi yapmayan kontrol kontaklar\u0131 ve koruma cihazlar\u0131 i\u00e7in de uygulanmal\u0131d\u0131r.<\/p>\n<h2>Standart E\u011friler<\/h2>\n<p>IEC\/EN 60898-1, ev ve hafif ticari tesisatlar\u0131n ezici \u00e7o\u011funlu\u011funda kullan\u0131lan \u00fc\u00e7 e\u011friyi tan\u0131mlar.<\/p>\n<table>\n<tbody>\n<tr>\n<th>E\u011fri<\/th>\n<th>Manyetik a\u00e7ma e\u015fi\u011fi<\/th>\n<th>E\u015fik de\u011ferinde tipik a\u00e7ma s\u00fcresi<\/th>\n<th>Tasarland\u0131\u011f\u0131 yer<\/th>\n<th>Yayg\u0131n uygulamalar<\/th>\n<\/tr>\n<tr>\n<td><strong>Tip B<\/strong><\/td>\n<td>3-5 \u00d7 I<sub>n<\/sub><\/td>\n<td>\u00dcst s\u0131n\u0131rda 0,1 s ve alt\u0131nda<\/td>\n<td>Minimum giri\u015f ak\u0131m\u0131 olan y\u00fckler<\/td>\n<td>Ayd\u0131nlatma devreleri, diren\u00e7li \u0131s\u0131tma, ev tipi prizler, PLC ve enstr\u00fcmantasyon beslemeleri, kontrol devreleri<\/td>\n<\/tr>\n<tr>\n<td><strong>Tip C<\/strong><\/td>\n<td>5-10 \u00d7 I<sub>n<\/sub><\/td>\n<td>\u00dcst s\u0131n\u0131rda 0,1 s ve alt\u0131nda<\/td>\n<td>End\u00fcktif ve kar\u0131\u015f\u0131k y\u00fckler<\/td>\n<td>Standart motorlar, pompalar, fanlar, HVAC, ticari priz devreleri, genel end\u00fcstriyel da\u011f\u0131t\u0131m<\/td>\n<\/tr>\n<tr>\n<td><strong>Tip D<\/strong><\/td>\n<td>10-20 \u00d7 I<sub>n<\/sub><\/td>\n<td>\u00dcst s\u0131n\u0131rda 0,1 s ve alt\u0131nda<\/td>\n<td>\u00c7ok y\u00fcksek giri\u015f ak\u0131m\u0131<\/td>\n<td>B\u00fcy\u00fck transformat\u00f6rler, kaynak makineleri, r\u00f6ntgen cihazlar\u0131, jenerat\u00f6rler, b\u00fcy\u00fck motorlar, vin\u00e7ler ve asans\u00f6rler, kompres\u00f6rler<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4276\" src=\"https:\/\/huyuglobal.com\/wp-content\/uploads\/2026\/09\/The-Standard-Curves.webp\" alt=\"Standart E\u011friler\" width=\"1448\" height=\"1086\" \/><\/p>\n<p>Hiyerar\u015fiyi takip etmenin etkili bir yolu, say\u0131 aral\u0131klar\u0131n\u0131n a\u015fa\u011f\u0131 yukar\u0131 ard\u0131\u015f\u0131k olmas\u0131d\u0131r; bu da e\u011frilerin toleransta bir dizi basama\u011fa benzemesi anlam\u0131na gelir. B e\u011frisinde, nominal de\u011ferin ka\u00e7 kat\u0131na kadar atlayabilece\u011fi yakla\u015f\u0131k \u00fc\u00e7 ila be\u015f aras\u0131ndad\u0131r, C e\u011frisinde bu say\u0131 be\u015f ila on aras\u0131nda ve D e\u011frisinde on ila yirmi aras\u0131ndad\u0131r. E\u015fi\u011fin \u00fczerinde her \u015fey neredeyse an\u0131nda tepki verirken, e\u015fik alt\u0131nda her \u015fey daha yava\u015f termal ajan \u00fczerinden i\u015flenmek zorundad\u0131r, e\u011fer i\u015flenebiliyorsa.<\/p>\n<p>Tip C ile ilgili iki \u00f6nemli nokta vard\u0131r. \u0130lk olarak, Tip C asl\u0131nda end\u00fcstrideki \u00e7o\u011fu ticari ve \u00fcretim ekipman\u0131 i\u00e7in varsay\u0131lan se\u00e7enektir \u00e7\u00fcnk\u00fc giri\u015f tolerans seviyesi ile ar\u0131za hassasiyeti seviyesi aras\u0131ndaki denge a\u00e7\u0131s\u0131ndan yeterince iyidir. Ayr\u0131ca, diren\u00e7li y\u00fckler i\u00e7in k\u00f6t\u00fc bir se\u00e7enek de\u011fildir \u00e7\u00fcnk\u00fc kablo korumas\u0131 i\u00e7in hala iyi \u00e7al\u0131\u015f\u0131r. Tip B kullanman\u0131n ana nedeni hassasiyet fakt\u00f6r\u00fcd\u00fcr: daha d\u00fc\u015f\u00fck manyetik bozulmalarda a\u00e7ar ve bu nedenle ar\u0131zan\u0131n geli\u015fmesine ve pahal\u0131 kontrol devresini etkilemesine izin verebilir, Tip B cihaz\u0131 tetiklenmeden \u00f6nce.<\/p>\n<h2>Di\u011fer E\u011friler ve Varyantlar<\/h2>\n<p>B, C ve D standart settir, ancak belirli problemler i\u00e7in birka\u00e7 ba\u015fka \u00f6zellik mevcuttur.<\/p>\n<table>\n<tbody>\n<tr>\n<th>E\u011fri<\/th>\n<th>Manyetik e\u015fik<\/th>\n<th>Ama\u00e7lanan kullan\u0131m<\/th>\n<\/tr>\n<tr>\n<td>Tip A<\/td>\n<td>2-3 \u00d7 I<sub>n<\/sub><\/td>\n<td>\u00c7ok hassas k\u0131sa devre korumas\u0131 gerektiren yar\u0131 iletken ve elektronik y\u00fckler; uzun kablo hatlar\u0131ndaki k\u0131sa devreler<\/td>\n<\/tr>\n<tr>\n<td>Tip Z<\/td>\n<td>2-3 \u00d7 I<sub>n<\/sub><\/td>\n<td>Hassasiyetin \u00f6ncelikli oldu\u011fu elektronik ve kontrol devreleri; farkl\u0131 bir standart k\u00f6keni ile Tip A'ya benzer<\/td>\n<\/tr>\n<tr>\n<td>Tip K<\/td>\n<td>8-12 \u00d7 I<sub>n<\/sub><\/td>\n<td>Tip D'nin a\u015f\u0131r\u0131 duyars\u0131z olaca\u011f\u0131 y\u00fcksek kalk\u0131\u015f ak\u0131m\u0131 olan motorlar, trafolar ve ekipmanlar<\/td>\n<\/tr>\n<tr>\n<td>Tip MA<\/td>\n<td>Sadece manyetik, yakla\u015f\u0131k 12 \u00d7 I<sub>n<\/sub><\/td>\n<td>A\u015f\u0131r\u0131 y\u00fck\u00fcn ayr\u0131 bir a\u015f\u0131r\u0131 y\u00fck r\u00f6lesi taraf\u0131ndan y\u00f6netildi\u011fi motor devre korumas\u0131; termal eleman yok<\/td>\n<\/tr>\n<tr>\n<td>Ayarlanabilir e\u011friler (MCCB)<\/td>\n<td>Saha ayarlanabilir<\/td>\n<td>E\u011frisi ve derecesi kurulum i\u00e7in ayarlanabilen ve yukar\u0131 ak\u0131\u015f cihazlar\u0131yla koordine edilebilen kal\u0131pl\u0131 kesiciler<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Cihaz aileleri aras\u0131ndaki fark bu nedenle \u00f6nemlidir \u00e7\u00fcnk\u00fc mevcut e\u011friler kesicinin \u00fcretiminde kullan\u0131lan standarda ba\u011fl\u0131d\u0131r. IEC 60898-1 uyumlu minyat\u00fcr devre kesiciler, B, C veya D ailelerinden herhangi birinde ayar imkan\u0131 olmayan sabit e\u011friler kullan\u0131r. \u00d6te yandan IEC 60947-2 uyumlu kal\u0131pl\u0131 devre kesiciler, manyetik ve termal ayarlar\u0131n bir miktar ayarlanabilme imkan\u0131 sunar, bu da sabit se\u00e7eneklerin aksine da\u011f\u0131t\u0131m sistemi genelinde senkronizasyon olana\u011f\u0131 yarat\u0131r. Cihaz aileleri aras\u0131ndaki karar, e\u011fri se\u00e7imine de\u011fil, derecelendirme, ar\u0131za seviyesi ve ayarlara ili\u015fkindir.<\/p>\n<h2>B E\u011frisi vs C E\u011frisi<\/h2>\n<p>Bu en yayg\u0131n pratik kar\u015f\u0131la\u015ft\u0131rmad\u0131r ve cevap neredeyse tamamen kalk\u0131\u015f ak\u0131m\u0131na ba\u011fl\u0131d\u0131r.<\/p>\n<table>\n<tbody>\n<tr>\n<th><\/th>\n<th>Tip B<\/th>\n<th>Tip C<\/th>\n<\/tr>\n<tr>\n<td>Manyetik trip band\u0131<\/td>\n<td>3-5 \u00d7 I<sub>n<\/sub><\/td>\n<td>5-10 \u00d7 I<sub>n<\/sub><\/td>\n<\/tr>\n<tr>\n<td>6 \u00d7 I'ye tepki<sub>n<\/sub> ani y\u00fckseli\u015f<\/td>\n<td>Band\u0131n \u00fcst k\u0131sm\u0131nda an\u0131nda a\u00e7ar<\/td>\n<td>Tolerans g\u00f6sterebilir; bireysel cihaza ba\u011fl\u0131 olarak sadece 5 \u00d7 \u00fczerinde a\u00e7ar<\/td>\n<\/tr>\n<tr>\n<td>Ger\u00e7ek ar\u0131zalara duyarl\u0131l\u0131k<\/td>\n<td>Daha y\u00fcksek \u2014 daha d\u00fc\u015f\u00fck b\u00fcy\u00fckl\u00fckteki k\u0131sa devreleri alg\u0131lar<\/td>\n<td>Daha d\u00fc\u015f\u00fck \u2014 d\u00fc\u015f\u00fck b\u00fcy\u00fckl\u00fckteki k\u0131sa devre termal elemana b\u0131rak\u0131labilir<\/td>\n<\/tr>\n<tr>\n<td>Motor devresinde risk<\/td>\n<td>Her kalk\u0131\u015fta gereksiz a\u00e7ma riski y\u00fcksek<\/td>\n<td>\u00c7o\u011fu durumda uygundur<\/td>\n<\/tr>\n<tr>\n<td>Ayd\u0131nlatma veya elektronik devresinde risk<\/td>\n<td>Yok; uygundur<\/td>\n<td>Geli\u015fmekte olan bir ar\u0131zan\u0131n alg\u0131lanmamas\u0131 m\u00fcmk\u00fcn<\/td>\n<\/tr>\n<tr>\n<td>Tipik spesifikasyon<\/td>\n<td>Ev ayd\u0131nlatmas\u0131, prizler, kontrol panelleri, enstr\u00fcmantasyon<\/td>\n<td>Motorlar, pompalar, HVAC, genel ticari ve end\u00fcstriyel da\u011f\u0131t\u0131m<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u0130ki band aras\u0131nda bir \u00f6rt\u00fc\u015fme oldu\u011fu dikkate de\u011ferdir: \u00d6rne\u011fin, Tip B band\u0131n\u0131n orta noktas\u0131nda (4 \u00d7 In) bulunan bir cihaz, Tip C band\u0131n\u0131n alt s\u0131n\u0131r\u0131nda (5 \u00d7 In) bulunan bir cihazdan \u00e7ok uzak de\u011fildir ve asl\u0131nda bantlar \u00fcretim toleranslar\u0131 nedeniyle kesin noktalar de\u011fil aral\u0131klar olarak g\u00f6r\u00fclmelidir. Bu nedenle, bazen gereksiz a\u00e7malar sadece \u00fcretici de\u011fi\u015ftirilerek \u00f6nlenebilir, e\u011fri de\u011fi\u015ftirilmeden, ancak do\u011fru hareket \u00fcreticinin yay\u0131mlad\u0131\u011f\u0131 bilgilerden do\u011fru e\u011friyi kullanmak olacakt\u0131r.<\/p>\n<p>Y\u00fck bir s\u0131n\u0131r\u0131n yak\u0131n\u0131ndaysa \u2014 \u00f6rne\u011fin, bir motorun ba\u015flang\u0131\u00e7 ak\u0131m\u0131 Tip C band\u0131n\u0131n tam kenar\u0131nda ise \u2014 spesifikasyon, hesaplamalarda kullan\u0131lan de\u011ferlerden ba\u011f\u0131ms\u0131z olarak ekipman\u0131n ger\u00e7ek ba\u015flang\u0131\u00e7 ak\u0131m\u0131 verilerine kar\u015f\u0131 do\u011frulanmal\u0131d\u0131r. Asl\u0131nda, kural gere\u011fi bir e\u011fri se\u00e7ip devreye alma sonras\u0131 \u00e7al\u0131\u015fmad\u0131\u011f\u0131n\u0131 fark etmek, bir panelin a\u00e7\u0131lmas\u0131 gereken en yayg\u0131n nedenlerden biridir. Ayn\u0131 cihaz-y\u00fck e\u015fle\u015ftirme prensibi kutup konfig\u00fcrasyonu i\u00e7in de ge\u00e7erlidir ve bunun se\u00e7im mant\u0131\u011f\u0131 rehberimizde a\u00e7\u0131klanm\u0131\u015ft\u0131r. <a href=\"https:\/\/huyuglobal.com\/tr\/blog\/1-pole-vs-2-pole-circuit-breaker\/\">tek kutuplu ve \u00e7ift kutuplu kesiciler<\/a>.<\/p>\n<h2>\u201cAC E\u011frisi\u201d Sorusu<\/h2>\n<p>IEC 60898-1 standard\u0131nda \u201cAC e\u011frisi\u201d tan\u0131m\u0131 yoktur ve bu terimin pratikte kullan\u0131lmas\u0131 nedeniyle bunu a\u00e7\u0131kl\u0131\u011fa kavu\u015fturmak \u00f6nemlidir. \u201cAC e\u011frisi\u201d terimi genellikle a\u015fa\u011f\u0131daki iki \u015feyden birini ifade eder.<\/p>\n<ul>\n<li>Birincisi, AC i\u00e7in derecelendirilmi\u015f ve DC i\u00e7in olmayan bir kesicinin s\u0131n\u0131fland\u0131r\u0131lmas\u0131d\u0131r. Bu ge\u00e7erli bir noktad\u0131r ancak s\u0131n\u0131fland\u0131rman\u0131n kendisinden ziyade cihaz\u0131n derecelendirmesi ile ilgilidir. AC ve DC kesiciler farkl\u0131 tasar\u0131mlara sahiptir, \u00e7\u00fcnk\u00fc DC devrelerinde ark s\u00f6nd\u00fcrmek \u00e7ok daha zordur. Bunun nedeni, ak\u0131m\u0131n bir d\u00f6ng\u00fcde iki kez s\u0131f\u0131ra ula\u015fmamas\u0131 ve bu y\u00fczden arka\u011f\u0131n do\u011fal olarak s\u00f6nd\u00fc\u011f\u00fc bir noktan\u0131n olmamas\u0131d\u0131r. Sonu\u00e7 olarak, DC dereceli kesici, farkl\u0131 e\u011friler dahil olmak \u00fczere farkl\u0131 ark kanallar\u0131, kontaklar ve manyetik sistem tasar\u0131mlar\u0131na sahiptir. AC dereceli bir kesicinin DC devresinde kullan\u0131lmas\u0131, e\u011fri hatas\u0131ndan ziyade bir uygulama hatas\u0131d\u0131r.<\/li>\n<li>Bu terimin ikinci anlam\u0131, konu\u015fmalarda yanl\u0131\u015f anla\u015f\u0131lan Tip C\u2019dir. Bu kar\u0131\u015f\u0131kl\u0131k yo\u011fun bir at\u00f6lyede ve dil s\u0131n\u0131rlar\u0131 aras\u0131nda kolayca olu\u015fabilir. Ger\u00e7ek bir DC uygulamas\u0131 varsa \u2014 g\u00fcne\u015f panelleri, bataryalar, DC \u00e7eki\u015f, telekom g\u00fc\u00e7 \u2014 uygun DC derecelendirmesi ve e\u011friler kullan\u0131lmal\u0131 ve polarite de \u00f6nemli olabilir. Genel olarak, bir spesifikasyonda \u201cAC e\u011frisi\u201d belirtilmi\u015fse, bunun ne anlama geldi\u011fi \u00f6\u011frenilmeli ve sipari\u015f vermeden \u00f6nce cihaz\u0131n derecelendirmeleri do\u011frulanmal\u0131d\u0131r.<\/li>\n<\/ul>\n<h2>E\u011fri Nas\u0131l Se\u00e7ilir<\/h2>\n<p>Uygun e\u011frinin se\u00e7ilmesi basit bir prosed\u00fcrd\u00fcr. Bu i\u015flem s\u0131ral\u0131 olarak yap\u0131lmal\u0131d\u0131r \u00e7\u00fcnk\u00fc e\u011fri se\u00e7imini kablo boyutu tahmininden \u00f6nce atlamak sorunlara yol a\u00e7abilir.<\/p>\n<ul>\n<li>S\u00fcrekli y\u00fck ak\u0131m\u0131n\u0131 hesaplay\u0131n. Bu, kesicinin nominal ak\u0131m (In) de\u011ferini belirler, ancak cihaz\u0131n e\u011frisi ile ba\u011flant\u0131s\u0131 yoktur. Kesici, kabloyu korumak i\u00e7in tasarlanm\u0131\u015ft\u0131r, bu da s\u00fcre\u00e7te kablo ta\u015f\u0131ma kapasitesinin s\u0131n\u0131rlay\u0131c\u0131 fakt\u00f6r oldu\u011fu anlam\u0131na gelir.<\/li>\n<li>Devrenin t\u00fcm elemanlar\u0131n\u0131n ba\u015flang\u0131\u00e7 ak\u0131m\u0131 de\u011ferlerini bulun. Motorlar i\u00e7in bu, \u00e7al\u0131\u015fma ak\u0131m\u0131n\u0131n be\u015f ila sekiz kat\u0131 olurken, trafolar ve benzeri end\u00fcktif y\u00fckler nominal ak\u0131m\u0131n 10 ila 14 kat\u0131 veya daha fazlas\u0131n\u0131 \u00fcretebilir. Diren\u00e7li ve elektronik y\u00fcklerin katk\u0131s\u0131 ihmal edilebilir, \u00e7\u00fcnk\u00fc neredeyse s\u0131f\u0131ra e\u015fittir.<\/li>\n<li>Ba\u015flang\u0131\u00e7 ak\u0131m\u0131n\u0131n nominal ak\u0131ma oran\u0131n\u0131 hesaplay\u0131n. Oran nominal ak\u0131m\u0131n \u00fc\u00e7 kat\u0131n\u0131n alt\u0131ndaysa, bu sorunla ba\u015fa \u00e7\u0131kmak i\u00e7in B tipi e\u011fri uygundur. Oran \u00fc\u00e7 ile be\u015f aras\u0131nda ise, B tipi kullan\u0131labilir ancak C tipi daha g\u00fcvenilir bir se\u00e7im olacakt\u0131r. Oran be\u015ften y\u00fcksekse, C tipi en iyi se\u00e7enektir. Hesaplama on kat\u0131ndan y\u00fcksek bir oran g\u00f6steriyorsa, D tipi e\u011fri uygulanmal\u0131d\u0131r.<\/li>\n<li>Kablo tipi ve kesme s\u00fcresini dikkate ald\u0131\u011f\u0131n\u0131zdan emin olun. Daha y\u00fcksek e\u011fri tipleri b\u00fcy\u00fck ak\u0131mlarda daha iyi \u00e7al\u0131\u015f\u0131r, ancak ayn\u0131 zamanda ortalama ar\u0131za ak\u0131mlar\u0131nda d\u00fczg\u00fcn \u00e7al\u0131\u015fmazlar. \u00d6zellikle uzun kablo hatlar\u0131nda, d\u00fc\u015f\u00fck ar\u0131za ak\u0131m\u0131 durumunda bile devre kesmenin do\u011fru zamanda ger\u00e7ekle\u015fti\u011fini do\u011frulay\u0131n.<\/li>\n<li>Bu \u00f6zel kesiciyi kullan\u0131rken, devrede bu cihaz\u0131n \u00fczerindeki t\u00fcm yukar\u0131 ak\u0131\u015f cihazlar\u0131n\u0131n devre d\u0131\u015f\u0131 b\u0131rak\u0131ld\u0131\u011f\u0131ndan emin olun. Devrede C tipi cihaz\u0131n alt\u0131nda kurulu D tipi cihaz durumunda, iki tipin tan\u0131ml\u0131 ar\u0131za ak\u0131m\u0131 alt\u0131ndaki farkl\u0131 performanslar\u0131 nedeniyle d\u00fczg\u00fcn \u00e7al\u0131\u015fmayabilirler.<\/li>\n<li>Kurulu yerde kar\u015f\u0131la\u015f\u0131lmas\u0131 beklenen k\u0131sa devre ak\u0131m\u0131ndan daha y\u00fcksek bir kesme kapasitesinin olup olmad\u0131\u011f\u0131n\u0131 kontrol edin. Bu ak\u0131m de\u011ferini varsaymak yerine hesaplaman\u0131z \u00f6nerilir.<\/li>\n<li>Make sure that the device has passed testing and is certified for use. The following topics are covered in our article regarding UL 489 certification.<\/li>\n<\/ul>\n<p>Once the correct curve is known, the remaining selection is straightforward. A manufacturer offering B, C and D curves across a single certified product family simplifies both specification and spares holding; the <a href=\"https:\/\/huyuglobal.com\/tr\/product\/hum18-63n-mcb-1p-to-4p-63a-type-b-c-d\/\">HUM18-63N range<\/a>, available from 1P to 4P at up to 63 A in B, C and D curves, is an example of that structure and illustrates the specification detail a buyer should expect.<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4277\" src=\"https:\/\/huyuglobal.com\/wp-content\/uploads\/2026\/09\/How-to-Select-a-Curve.webp\" alt=\"E\u011fri Nas\u0131l Se\u00e7ilir\" width=\"1448\" height=\"1086\" \/><\/p>\n<h2>Ambient Temperature and Derating<\/h2>\n<p>When it comes to devices that follow IEC 60898-1, the curve identifies behaviour at a reference temperature, generally at 30\u00b0C. This is due to the fact that the overload element operates on thermal basis, and as a result, its performance changes along the changes in temperature around it, and this is a common reason of unexpected tripping in installations.<\/p>\n<p>In the case of a hot environment, e.g. for a panel during a hot day, a distribution board in a box exposed to sun, or a breaker next to equipment that produces heat, the bimetallic strip has a higher starting point and reaches its trip point at lower current, which is significant, as manufacturers have tables showing how devices with 20A operating at 60\u00b0c would carry a much lesser current, and vice versa, when the unit is functioned at lower temperature level, it would trip at a higher current level.<\/p>\n<p>There are three things worth mentioning. First, when placing devices in warm spots one may select breaker rating based on derating tables data rather than nominal value, which may indicate the need to pick a higher rating. Second, devices installed close together in panels impact each other by means that the manufacturer\u2019s factor has to be added to the ambient correction. Third, if circuit trips only on hot afternoons, it is rather a case of derating issue as opposed to the fault in operation. Where a device is genuinely suspect, the diagnostic approach in our guide to <a href=\"https:\/\/huyuglobal.com\/tr\/blog\/how-to-tell-if-a-breaker-is-bad\/\">identifying a failed breaker<\/a> is the place to start.<\/p>\n<h2>Yayg\u0131n Hatalar<\/h2>\n<ul>\n<li>Increasing ampacity rather than modifying the curve is the most severe mistake in this field. Installing a 32 A circuit breaker within a circuit wired using a 20 A electric cable implies that the wires may get hot and insulation may deteriorate before the circuit breaker even operates. In essence, the circuit breaker offers protection to the wire more than to the load.<\/li>\n<li>Installing type D circuit breakers in less specific situations. Type D has the capacity to withstand inrushes but allows moderate fault currents for longer periods which may go unnoticed in susceptible circuits. Type D circuit breakers should only be used for high inrushing situations.<\/li>\n<li>Ignoring ambient correction factor. Sometimes a seemingly correct device may turn out to be wrong due to high temperatures.<\/li>\n<li>Mistaking B, C and D across different manufacturers. There are standards for the bands, but that does not mean that tolerances and the shape of curves remain the same; so it is wise to check the curves manufactured by a specific manufacturer rather than use the approximate values.<\/li>\n<li>Using an AC-rated device on DC current. Direct current requires much more complicated processes.<\/li>\n<li>Neglecting coordination. Even if devices are correctly selected they still may trip incorrectly because of coordination error.<\/li>\n<li>Selecting a curve prior to selecting a cable. The cable defines the rating of the circuit breaker, and the load determines the curve; otherwise, the installation may appear to have followed the rules while not being safe at all.<\/li>\n<\/ul>\n<h2>Standards and Certification<\/h2>\n<p>Which standard applies determines which curves exist, what the device is tested to, and what the markings mean.<\/p>\n<table>\n<tbody>\n<tr>\n<th>Standart<\/th>\n<th>Applies to<\/th>\n<th>Curve characteristics<\/th>\n<\/tr>\n<tr>\n<td>IEC\/EN 60898-1<\/td>\n<td>Miniature circuit breakers for household and similar installations<\/td>\n<td>Fixed B, C and D curves with defined magnetic bands; domestic and light commercial<\/td>\n<\/tr>\n<tr>\n<td>IEC\/EN 60947-2<\/td>\n<td>Circuit breakers for industrial installations, including MCCBs<\/td>\n<td>Often adjustable thermal and magnetic settings; used where coordination across a system is required<\/td>\n<\/tr>\n<tr>\n<td>UL 489<\/td>\n<td>Moulded-case circuit breakers for the North American market<\/td>\n<td>Uses different trip-band conventions; devices are not interchangeable with IEC curve types<\/td>\n<\/tr>\n<tr>\n<td>UL 1077<\/td>\n<td>Supplementary protectors<\/td>\n<td>Not branch-circuit protective devices; must not be substituted for a UL 489 breaker<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The North American distinction causes buyers who operate in multiple markets difficulty. A device that is labeled as &#8220;Type C&#8221; per IEC 60898-1 and a device that has a C-something catalog number per UL 489 are not the same thing and operate with different trip characteristics. This is particularly important when a single project crosses standards, such as a European panel that must be installed on a North American site: the certification is determined by the law at the installation site, which means that the device must be certified accordingly. The same rationale applies to the auxiliary functions provided by some of these devices: the certification must match the panel, not the catalog name.<\/p>\n<h2>SSS<\/h2>\n<h3>What does it mean to be a curve breaker?<\/h3>\n<p>This implies that the behavior of the circuit breaker in terms of tripping is based on a published time-current curve instead of one fixed trip value. Such a curve gives information on the operating time of the device for each multiple of rated current, giving the bottom line about the two types of tripping: a slow thermal one which protects conductors against overloading and instantaneous magnetic one which protects against short circuits. The letter indicating the type of circuitry on the device &#8211; B, C or D according to IEC 60898-1 &#8211; indicates the multiple to which the particular device belongs: 3-5, 5-10 and 10-20 times of rated current, respectively. The working principle of the curve is to determine the trip time rather the maximum current the device can carry.<\/p>\n<h3>What are the three types of breakers?<\/h3>\n<p>The standard types in the IEC 60898-1 family are three. The first type is type B with its magnetic trip range of 3 to 5 times the rated current; type C with a magnetic trip of 5 to 10 times rated current; and type D of 10 to 20 times rated current. The type B is suitable for loads that have minimal or negligible inrush, such as lighting, resistance heating, socket outlets and control instruments. Type C is the preferred type for mixed loads and for normal motors which makes it the most frequently used specification in commercial and industrial distribution. Type D is used for equipment that has big inrush loads, like large transformers, welders, generators, X-ray machines and big motors. Apart from these three types, there exist the types A, Z and K designed for specific applications and modern molded circuit breakers usually come with adjustable settings as opposed to fixed ones.<\/p>\n<h3>What does the AC curve breaker mean?<\/h3>\n<p>The term &#8220;AC curve&#8221; does not specifically exist in the IEC 60898-1 standard. In reality, &#8220;AC curve&#8221; could refer to either of two meanings. For example, it can relate to a device rated for AC service instead of DC service since breaking of arcs is considerably more difficult for DC due to the constant flow of electrical current. Devices rated specifically for DC operations have specially developed devices such as arc chutes and contacts. An &#8220;AC curve&#8221; could also mean type C as a result of malapropism or misunderstanding. It is important to be cautious when using this term since any order needs to indicate the intended meaning of &#8220;AC curve&#8221;. For application which actually requires working in DC mode such as photovoltaic solar cells or battery storage it is critically important to rely strictly on the devices that are rated for DC operations and use DC curves only by the manufacturers.<\/p>\n<h3>What&#8217;s the difference between B curve and C curve breakers?<\/h3>\n<p>The distinction comes down to the magnetic tripping curve. A Type B breaker trips at 3-5 times its rated current, whereas Type C trips at 5-10 times. In all other regards \u2014 that is, thermal overload mechanism, continuous current capacity, and size \u2014 they are practically identical. In practice, Type B is more sensitive, which is why it is good at identifying emerging fault conditions in low-inrush circuits; however, it also trips in case of motor startup. Type C is capable of withstanding the five to eight times inrush current produced by the motor while still being sufficiently sensitive for general use. Therefore, it tends to be the default circuit breaker in industrial and commercial installations. In theory, it is not that one type of circuit breaker is better than the other; any of them is appropriate for operating in its own conditions.<\/p>\n<h3>Can I fix nuisance tripping by fitting a bigger breaker?<\/h3>\n<p>No, this task is very dangerous to do. The amperage rating of a breaker is based on the current-carrying capacity of the wires it protects (typically a 15 A circuit is connected to 14 AWG wires, while a 20 A circuit is normally wired with 12 AWG cables). This means that connecting a 32 A breaker to a 20 A wire may result in an overheating wire which has no protection against overheating and may catch fire. Whenever there is a nuisance tripping problem on the motor circuit, one should rather consider it a curve problem than a rating issue and fix the issue by going from Type B to Type C or from C to D (if the inrush can justify this), while verifying the result on the actual inrush value rather than on speculation.<\/p>\n<h2>Referanslar<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.iec.ch\/\" rel=\"nofollow noopener\" target=\"_blank\">International Electrotechnical Commission \u2014 IEC 60898-1 Circuit Breakers for Household and Similar Installations<\/a><\/li>\n<li><a href=\"https:\/\/www.iec.ch\/\" rel=\"nofollow noopener\" target=\"_blank\">International Electrotechnical Commission \u2014 IEC 60947-2 Circuit Breakers for Industrial Installations<\/a><\/li>\n<li><a href=\"https:\/\/www.ul.com\/\" rel=\"nofollow noopener\" target=\"_blank\">UL Solutions \u2014 UL 489 Molded-Case Circuit Breakers and UL 1077 Supplementary Protectors<\/a><\/li>\n<li><a href=\"https:\/\/www.bsigroup.com\/\" rel=\"nofollow noopener\" target=\"_blank\">BSI \u2014 BS EN 60898-1 Requirements for MCB Trip Characteristics<\/a><\/li>\n<li><a href=\"https:\/\/www.nfpa.org\/\" rel=\"nofollow noopener\" target=\"_blank\">NFPA \u2014 National Electrical Code, Article 240 Overcurrent Protection<\/a><\/li>\n<\/ul>\n<h2>Sonu\u00e7<\/h2>\n<p>A curve breaker is merely a certain kind of breaker with its particular behaviour being identified by a curve, the only thing that varies with different curves being the current value at which magnetic device will operate. Type B operates at three to five times the nominal current and is appropriate for the loads whose launch is close to smooth; Type C at five to 10 times and is appropriate for the motor and mixed loads dominating typical installations; Type D at 10-20 and exists for transformers, welding machines, and huge equipment emitting such a pulse that the correctly selected breaker would trip all the time. The thermal overload response of all the devices is the same; that\u2019s the point that removes any confusion since it is evident that the curve is about the inrush discrimination and not about the protection capability. In order to avoid nuisance tripping, just define the cable rating, the curve based on the load\u2019s inrush curve, check that the above selected device reacts in short time in case of the lowest fault current, use derating factors and check the coordination with upstream devices.<\/p>","protected":false},"excerpt":{"rendered":"<p>A curve breaker may not be a new kind of breaker but refers to a breaker whose trip time is determined by a curve that has been preset so that it allows the circuit to trip every time a motor is switched on or stay closed when a wire is burning. It is easy to [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":4278,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_gspb_post_css":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-4275","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blogs"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/huyuglobal.com\/tr\/wp-json\/wp\/v2\/posts\/4275","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/huyuglobal.com\/tr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/huyuglobal.com\/tr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/huyuglobal.com\/tr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/huyuglobal.com\/tr\/wp-json\/wp\/v2\/comments?post=4275"}],"version-history":[{"count":2,"href":"https:\/\/huyuglobal.com\/tr\/wp-json\/wp\/v2\/posts\/4275\/revisions"}],"predecessor-version":[{"id":4280,"href":"https:\/\/huyuglobal.com\/tr\/wp-json\/wp\/v2\/posts\/4275\/revisions\/4280"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/huyuglobal.com\/tr\/wp-json\/wp\/v2\/media\/4278"}],"wp:attachment":[{"href":"https:\/\/huyuglobal.com\/tr\/wp-json\/wp\/v2\/media?parent=4275"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/huyuglobal.com\/tr\/wp-json\/wp\/v2\/categories?post=4275"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/huyuglobal.com\/tr\/wp-json\/wp\/v2\/tags?post=4275"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}