{"id":366,"date":"2026-10-20T07:39:38","date_gmt":"2026-10-20T07:39:38","guid":{"rendered":"https:\/\/sercomelectric.ro\/blog\/?p=366"},"modified":"2026-10-20T07:39:40","modified_gmt":"2026-10-20T07:39:40","slug":"disjunctorul-electric-ce-este-cum-functioneaza-si-cum-alegi-modelul-potrivit","status":"publish","type":"post","link":"https:\/\/sercomelectric.ro\/blog\/disjunctorul-electric-ce-este-cum-functioneaza-si-cum-alegi-modelul-potrivit","title":{"rendered":"Disjunctorul electric: ce este, cum func\u021bioneaz\u0103 \u0219i cum alegi modelul potrivit"},"content":{"rendered":"<figure class=\"wp-block-post-featured-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"800\" src=\"https:\/\/sercomelectric.ro\/blog\/wp-content\/uploads\/2026\/10\/Disjunctorul-electric-tablou-electric-modular-cu-disjunctoare-verificat-de-un-electrician.jpg\" class=\"attachment-post-thumbnail size-post-thumbnail wp-post-image\" alt=\"Disjunctor Electric - Sercomelectric\" style=\"object-fit:cover;\" srcset=\"https:\/\/sercomelectric.ro\/blog\/wp-content\/uploads\/2026\/10\/Disjunctorul-electric-tablou-electric-modular-cu-disjunctoare-verificat-de-un-electrician.jpg 1200w, https:\/\/sercomelectric.ro\/blog\/wp-content\/uploads\/2026\/10\/Disjunctorul-electric-tablou-electric-modular-cu-disjunctoare-verificat-de-un-electrician-300x200.jpg 300w, https:\/\/sercomelectric.ro\/blog\/wp-content\/uploads\/2026\/10\/Disjunctorul-electric-tablou-electric-modular-cu-disjunctoare-verificat-de-un-electrician-1024x683.jpg 1024w, https:\/\/sercomelectric.ro\/blog\/wp-content\/uploads\/2026\/10\/Disjunctorul-electric-tablou-electric-modular-cu-disjunctoare-verificat-de-un-electrician-768x512.jpg 768w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n<p class=\"wp-block-paragraph\">Sursa foto: Magnific.com<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00centr-un tablou electric pentru o cl\u0103dire industrial\u0103, un spa\u021biu comercial sau o locuin\u021b\u0103, disjunctorul trebuie s\u0103 \u00eentrerup\u0103 circuitul c\u00e2nd curentul dep\u0103\u0219e\u0219te limitele stabilite pentru conductoare \u0219i aparat. Alegerea porne\u0219te de la sarcin\u0103 \u0219i cablu, apoi continu\u0103 cu curba de declan\u0219are, capacitatea de rupere, num\u0103rul de poli \u0219i coordonarea cu protec\u021biile din amonte.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pe carcas\u0103 po\u021bi \u00eent\u00e2lni marcaje precum B16, C20, 6 kA sau 1P+N. Fiecare descrie o caracteristic\u0103 diferit\u0103, iar niciuna nu confirm\u0103 singur\u0103 c\u0103 aparatul se potrive\u0219te circuitului. Parcurge criteriile de mai jos ca s\u0103 interpretezi corect marcajele \u0219i s\u0103 \u0219tii ce verific\u0103 electricianul \u00eenainte de punerea \u00een func\u021biune.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Rezumat:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Disjunctorul magnetotermic protejeaz\u0103 circuitul la suprasarcin\u0103 \u0219i scurtcircuit.<\/li>\n\n\n\n<li>Curbele B \u0219i C au praguri magnetice diferite; alegerea \u021bine cont \u0219i de curentul de pornire \u0219i de m\u0103sur\u0103torile instala\u021biei.<\/li>\n\n\n\n<li>Curentul nominal trebuie coordonat cu sarcina \u0219i capacitatea conductorului, iar capacitatea de rupere cu curentul de scurtcircuit prezumat.<\/li>\n\n\n\n<li>RCCB detecteaz\u0103 curentul rezidual. RCBO combin\u0103 aceast\u0103 func\u021bie cu protec\u021bia la supracurent.<\/li>\n<\/ol>\n\n\n\n<div class=\"wp-block-rank-math-toc-block\" id=\"rank-math-toc\"><h2>Cuprins<\/h2><nav><ul><li class=\"\"><a href=\"#\ud83c\udfd7\ufe0f-tipurile-de-tablouri-electrice-\u0219i-structura-lor-generala\">Ce este un disjunctor electric \u0219i cum func\u021bioneaz\u0103?<\/a><\/li><li class=\"\"><a href=\"#\ud83d\udd0c-tipurile-de-siguran\u021be-care-se-pun-la-tabloul-electric-\u0219i-rolul-lor\">Cum alegi curba B, C sau D pentru disjunctor?<\/a><\/li><li class=\"\"><a href=\"#\ud83d\udd0b-siguran\u021be-fuzibile-\u0219i-separatoare-ac\">Cum alegi curentul nominal \u0219i capacitatea de rupere?<\/a><\/li><li class=\"\"><a href=\"#\ud83d\udd0b-siguran\u021be-fuzibile-\u0219i-separatoare-ac-1\">Cum alegi num\u0103rul de poli al disjunctorului?<\/a><\/li><li class=\"\"><a href=\"#cum-se-diferen\u021biaza-mcb-rccb-\u0219i-rcbo\">Cum se diferen\u021biaz\u0103 MCB, RCCB \u0219i RCBO?<\/a><\/li><li class=\"\"><a href=\"#ce-verifici-cand-disjunctorul-declan\u0219eaza-repetat\">Ce verifici c\u00e2nd disjunctorul declan\u0219eaz\u0103 repetat?<\/a><\/li><\/ul><\/nav><\/div>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>\u00centrebare<\/strong><\/td><td><strong>R\u0103spuns direct<\/strong><\/td><\/tr><tr><td>Ce protejeaz\u0103 un MCB?<\/td><td>Circuitul la suprasarcin\u0103 \u0219i scurtcircuit, dac\u0103 este corect dimensionat.<\/td><\/tr><tr><td>Ce \u00eenseamn\u0103 B16?<\/td><td>Curba B \u0219i un curent nominal de 16 A.<\/td><\/tr><tr><td>Ce diferen\u021biaz\u0103 B de C?<\/td><td>Pragul magnetic: 3-5 ori In la B \u0219i 5-10 ori In la C.<\/td><\/tr><tr><td>Ce indic\u0103 6 kA?<\/td><td>Capacitatea nominal\u0103 de rupere la scurtcircuit, nu curentul normal de lucru.<\/td><\/tr><tr><td>MCB detecteaz\u0103 curentul rezidual?<\/td><td>Nu. Pentru aceast\u0103 func\u021bie se proiecteaz\u0103 un RCCB sau un RCBO.<\/td><\/tr><tr><td>Po\u021bi m\u0103ri amperajul dac\u0103 declan\u0219eaz\u0103?<\/td><td>Nu f\u0103r\u0103 verificarea conductorului, sarcinii \u0219i curentului de defect.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-left\" id=\"\ud83c\udfd7\ufe0f-tipurile-de-tablouri-electrice-\u0219i-structura-lor-generala\"><strong><strong><strong>Ce este un disjunctor electric \u0219i cum func\u021bioneaz\u0103?<\/strong><\/strong><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Disjunctorul electric, numit \u0219i \u00eentrerup\u0103tor automat sau siguran\u021b\u0103 automat\u0103, \u00eentrerupe alimentarea c\u00e2nd detecteaz\u0103 un curent peste limita admis\u0103 de caracteristica sa. \u00cen tablourile de joas\u0103 tensiune, un MCB modular protejeaz\u0103 circuitul \u0219i conductoarele \u00eempotriva suprasarcinii \u0219i scurtcircuitului. Dup\u0103 remedierea defectului, mecanismul poate fi rearmat manual, dac\u0103 aparatul nu a fost deteriorat.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Aparatul se monteaz\u0103 \u00eempreun\u0103 cu celelalte elemente ale tabloului \u0219i protec\u021biilor electrice. Func\u021bia lui depinde de caracteristicile alese \u0219i de modul \u00een care este proiectat circuitul.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/sercomelectric.ro\/blog\/wp-content\/uploads\/2026\/10\/1.-Ce-este-un-disjunctor-electric-electrician-care-verifica-un-tablou-electric-modular-cu-un-multimetru-1024x683.jpg\" alt=\"Disjunctor electric - Sercomelectric\" class=\"wp-image-369\" srcset=\"https:\/\/sercomelectric.ro\/blog\/wp-content\/uploads\/2026\/10\/1.-Ce-este-un-disjunctor-electric-electrician-care-verifica-un-tablou-electric-modular-cu-un-multimetru-1024x683.jpg 1024w, https:\/\/sercomelectric.ro\/blog\/wp-content\/uploads\/2026\/10\/1.-Ce-este-un-disjunctor-electric-electrician-care-verifica-un-tablou-electric-modular-cu-un-multimetru-300x200.jpg 300w, https:\/\/sercomelectric.ro\/blog\/wp-content\/uploads\/2026\/10\/1.-Ce-este-un-disjunctor-electric-electrician-care-verifica-un-tablou-electric-modular-cu-un-multimetru-768x512.jpg 768w, https:\/\/sercomelectric.ro\/blog\/wp-content\/uploads\/2026\/10\/1.-Ce-este-un-disjunctor-electric-electrician-care-verifica-un-tablou-electric-modular-cu-un-multimetru.jpg 1200w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Sursa foto: Magnific.com<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"\ud83d\udd12-tablouri-din-pvc-cu-u\u0219a-metalica-\u0219i-dulapuri-electrice\"><strong><strong>Ce \u00eenseamn\u0103 declan\u0219area termic\u0103?<\/strong><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La o suprasarcin\u0103, curentul dep\u0103\u0219e\u0219te valoarea nominal\u0103 suficient de mult timp pentru a \u00eenc\u0103lzi mecanismul termic, de regul\u0103 o lamel\u0103 bimetalic\u0103. Aceasta se deformeaz\u0103 \u0219i elibereaz\u0103 mecanismul de declan\u0219are. Reac\u021bia nu este instantanee: timpul depinde de valoarea supracurentului \u0219i de caracteristica aparatului.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"cum-intervine-protec\u021bia-magnetica\"><strong>Cum intervine protec\u021bia magnetic\u0103?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La un scurtcircuit, curentul poate cre\u0219te puternic \u00eentr-un interval foarte scurt. Bobina electromagnetic\u0103 ac\u021bioneaz\u0103 mecanismul de declan\u0219are, iar contactele se deschid. Arcul electric format la separarea contactelor este limitat \u0219i stins \u00een camera de stingere.\u00a0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Aten\u021bie! Un MCB standard nu m\u0103soar\u0103 curentul rezidual \u0219i nu \u00eenlocuie\u0219te protec\u021bia diferen\u021bial\u0103. Nici nu acoper\u0103 automat riscurile de supratensiune sau toate situa\u021biile de electrocutare. \u00cemp\u0103m\u00e2ntarea, izola\u021bia, protec\u021biile diferen\u021biale \u0219i coordonarea aparatelor au roluri distincte.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-left\" id=\"\ud83d\udd0c-tipurile-de-siguran\u021be-care-se-pun-la-tabloul-electric-\u0219i-rolul-lor\"><strong><strong>Cum alegi curba B, C sau D pentru disjunctor?<\/strong><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"care-este-diferen\u021ba-dintre-curba-b-\u0219i-curba-c\"><strong>Care este diferen\u021ba dintre curba B \u0219i curba C?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Litera indic\u0103 pragul de declan\u0219are magnetic\u0103 instantanee, raportat la curentul nominal In. Pentru caracteristicile uzuale conform IEC 60898-1, pragul este de 3-5 ori In la curba B \u0219i de 5-10 ori In la curba C. Curba D are un prag mai ridicat, de regul\u0103 10-20 ori In, pentru aplica\u021bii cu curen\u021bi mari de pornire. Valorile sunt intervale de declan\u0219are magnetic\u0103, nu descriu singure \u00eentreaga curb\u0103 timp-curent.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Curba<\/td><td>Prag magnetic uzual<\/td><td>Ce se verific\u0103<\/td><\/tr><tr><td>B<\/td><td>3-5 x In<\/td><td>Sarcini cu v\u00e2rfuri de pornire reduse \u0219i condi\u021biile de declan\u0219are la defect.<\/td><\/tr><tr><td>C<\/td><td>5-10 x In<\/td><td>V\u00e2rfuri de pornire mai ridicate, de exemplu la unele motoare sau compresoare.<\/td><\/tr><tr><td>D<\/td><td>10-20 x In<\/td><td>Sarcini cu pornire dificil\u0103, numai dup\u0103 verificarea parametrilor instala\u021biei.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">De exemplu, pentru un aparat de 16 A, intervalele magnetice corespunz\u0103toare curbelor B \u0219i C sunt 48-80 A, respectiv 80-160 A. Valorile nu stabilesc curentul de func\u021bionare continu\u0103 al circuitului. Curba B nu \u00eenseamn\u0103 automat \u201ereziden\u021bial\u201d, iar curba C nu \u00eenseamn\u0103 automat \u201eindustrial\u201d. Alegerea depinde de sarcin\u0103 \u0219i de posibilitatea circuitului de a furniza curentul de defect necesar declan\u0219\u0103rii \u00een timpul cerut. Tocmai de aceea, consult\u0103 cu aten\u021bie <a href=\"https:\/\/sercomelectric.ro\/257-sigurante-automate-curba-b\">siguran\u021bele cu curba B<\/a> \u0219i <a href=\"https:\/\/sercomelectric.ro\/258-sigurante-automate-curba-c\">siguran\u021bele cu curba C<\/a> \u00een func\u021bie de proiect, nu doar de tipul cl\u0103dirii.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">De altfel, experien\u021bele din comunit\u0103\u021bile online arat\u0103 de ce un singur exemplu nu poate dicta alegerea. Don_Costica a relatat pe Forumul Softpedia c\u0103, dup\u0103 montarea curbei B, nu a mai putut folosi polizorul \u0219i pompa submersibil\u0103; dup\u0103 trecerea la C, aparatele au func\u021bionat. E o relatare despre instala\u021bia lui, nu o recomandare de schimbare f\u0103r\u0103 m\u0103sur\u0103tori. Un electrician trebuie s\u0103 verifice curentul de pornire, impedan\u021ba buclei \u0219i condi\u021biile de protec\u021bie \u00eenainte de a modifica aparatul (Don_Costica, Forumul Softpedia, 10 decembrie 2022).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00centr-o alt\u0103 discu\u021bie, Consultant Electrice a spus c\u0103 a folosit aparate B de 6 A pentru iluminat \u0219i de 10 A pentru unele circuite de prize cu sarcini mici, f\u0103r\u0103 probleme \u00een acea instala\u021bie. Configura\u021bia \u0219i m\u0103sur\u0103torile complete nu sunt prezentate, a\u0219a c\u0103 relatarea nu stabile\u0219te valori potrivite pentru alte circuite (Consultant Electrice, Forum.MisiuneaCasa.ro, 24 martie 2024).<\/p>\n\n\n\n<h2 id=\"\ud83d\udd0b-siguran\u021be-fuzibile-\u0219i-separatoare-ac\" class=\"wp-block-heading\"><strong><strong>Cum alegi curentul nominal \u0219i capacitatea de rupere?<\/strong><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"curentul-nominal-se-coordoneaza-cu-conductorul\"><strong>Curentul nominal se coordoneaz\u0103 cu conductorul<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Curentul nominal al disjunctorului nu se alege doar dup\u0103 puterea unui consumator sau dup\u0103 valoarea \u00eent\u00e2lnit\u0103 frecvent \u00eentr-un tablou. Proiectarea folose\u0219te rela\u021bia Ib \u2264 In \u2264 Iz: Ib este curentul de calcul al sarcinii, In este curentul nominal al protec\u021biei, iar Iz este curentul admisibil al conductorului \u00een condi\u021biile reale de instalare.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pentru a stabili Iz se iau \u00een calcul sec\u021biunea \u0219i materialul conductorului, lungimea traseului, modul de pozare, temperatura, gruparea cu alte cabluri \u0219i condi\u021biile de conexiune. Conteaz\u0103 \u0219i curentul de defect disponibil. De aceea, acela\u0219i aparat nu este potrivit automat pentru dou\u0103 cabluri cu aceea\u0219i sec\u021biune, dar instalate diferit.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"ce-indica-capacitatea-de-rupere-in-k-a\"><strong>Ce indic\u0103 capacitatea de rupere \u00een kA?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Marcajul de 4,5 kA, 6 kA sau 10 kA indic\u0103 nivelul de scurtcircuit pe care aparatul \u00eel poate \u00eentrerupe \u00een condi\u021biile standardului aplicabil. Nu este amperajul normal al circuitului \u0219i nici pragul la care declan\u0219eaz\u0103 protec\u021bia magnetic\u0103. Capacitatea nominal\u0103 de rupere trebuie s\u0103 fie cel pu\u021bin egal\u0103 cu curentul de scurtcircuit prezumat \u00een punctul de instalare sau s\u0103 fie asigurat\u0103 printr-o asociere verificat\u0103 de produc\u0103tor. Pentru MCB-uri se \u00eent\u00e2lne\u0219te marcajul Icn; pentru alte clase de \u00eentreruptoare se pot folosi parametri precum Icu \u0219i Ics.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Verific\u0103 \u0219i <strong>selectivitatea<\/strong>: la un defect pe un circuit, protec\u021bia din aval ar trebui s\u0103 \u00eentrerup\u0103 alimentarea f\u0103r\u0103 declan\u0219area inutil\u0103 a tuturor aparatelor din amonte. Acest rezultat nu se ob\u021bine doar aleg\u00e2nd valori diferite \u00een amperi; se verific\u0103 dup\u0103 curbele timp-curent \u0219i tabelele de coordonare ale produc\u0103torului. De asemenea, <a href=\"https:\/\/sercomelectric.ro\/49--sigurante-automate-\">siguran\u021bele automate<\/a> au valori \u0219i caracteristici diferite, care trebuie potrivite cu proiectul.<\/p>\n\n\n\n<h2 id=\"\ud83d\udd0b-siguran\u021be-fuzibile-\u0219i-separatoare-ac-1\" class=\"wp-block-heading\"><strong>Cum alegi num\u0103rul de poli al disjunctorului?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"> Num\u0103rul de poli arat\u0103 c\u00e2\u021bi conductori sunt \u00eentrerup\u021bi de aparat.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"care-este-diferen\u021ba-dintre-protec\u021biile-monopolare-\u0219i-bipolare\"><strong>Care este diferen\u021ba dintre protec\u021biile monopolare \u0219i bipolare?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Un disjunctor 1P \u00eentrerupe un singur pol. Un model 1P+N \u00eentrerupe faza \u0219i nulul, \u00eens\u0103 modul de protec\u021bie al fiec\u0103rui pol depinde de construc\u021bia aparatului. Un model 2P \u00eentrerupe simultan doi poli; verific\u0103 \u00een fi\u0219a tehnic\u0103 dac\u0103 ambii sunt proteja\u021bi la supracurent sau dac\u0103 unul este doar comutat. Pentru aliment\u0103ri trifazate se folosesc configura\u021bii precum 3P, 3P+N sau 4P, \u00een acord cu schema re\u021belei \u0219i normele aplicabile.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Po\u021bi consulta aparatele <a href=\"https:\/\/sercomelectric.ro\/259-sigurante-automate-monopolare-1p\">monopolare de 1P<\/a> \u0219i <a href=\"https:\/\/sercomelectric.ro\/261-sigurante-automate-bipolare-2p\">bipolare de 2P<\/a>, precum \u0219i ghidul nostru despre <a href=\"https:\/\/sercomelectric.ro\/blog\/diferenta-intre-sigurante-monopolare-si-bipolare\">diferen\u021ba dintre protec\u021biile monopolare \u0219i bipolare<\/a>. Sensul de alimentare nu este universal: urmeaz\u0103 schema de pe aparat \u0219i indica\u021biile produc\u0103torului.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Un comentator de pe YouTube, @yomyh, a descris o locuin\u021b\u0103 cump\u0103rat\u0103 semifinisat\u0103, unde spa\u021biul din tablou limita ad\u0103ugarea de circuite dup\u0103 finisaje. El \u00eentreba dac\u0103 aparatele diferen\u021biale late de dou\u0103 module puteau fi \u00eenlocuite cu modele compacte de un modul. Comentariul arat\u0103 c\u0103 l\u0103\u021bimea aparatelor poate conta la proiectarea tabloului, \u00eens\u0103 compatibilitatea, protec\u021bia circuitului \u0219i schema de conectare trebuie verificate separat. (@yomyh, YouTube, 2022).<\/p>\n\n\n\n<h2 id=\"cum-se-diferen\u021biaza-mcb-rccb-\u0219i-rcbo\" class=\"wp-block-heading\"><strong>Cum se diferen\u021biaz\u0103 MCB, RCCB \u0219i RCBO?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Aceste denumiri descriu func\u021bii diferite:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Un MCB, adic\u0103 disjunctorul magnetotermic modular, protejeaz\u0103 la suprasarcin\u0103 \u0219i scurtcircuit.\u00a0<\/li>\n\n\n\n<li>Un RCCB detecteaz\u0103 curentul rezidual, produs c\u00e2nd o parte din curent se scurge \u00een afara traseului normal; nu ofer\u0103 singur protec\u021bie la suprasarcin\u0103 sau scurtcircuit \u0219i trebuie coordonat cu un aparat de protec\u021bie la supracurent.\u00a0<\/li>\n\n\n\n<li>Un RCBO combin\u0103 protec\u021bia diferen\u021bial\u0103 cu protec\u021bia la supracurent, de regul\u0103 pentru un circuit individual. ABB descrie aceea\u0219i asociere \u00eentre dispozitivele diferen\u021biale \u0219i protec\u021bia la supracurent.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/sercomelectric.ro\/blog\/wp-content\/uploads\/2026\/10\/5.-Cum-se-diferentiaza-MCB-RCCB-si-RCBO-montate-pe-o-sina-DIN-intr-un-tablou-electric-1024x683.jpg\" alt=\"Disjunctorul electric - Sercomelectric\" class=\"wp-image-370\" srcset=\"https:\/\/sercomelectric.ro\/blog\/wp-content\/uploads\/2026\/10\/5.-Cum-se-diferentiaza-MCB-RCCB-si-RCBO-montate-pe-o-sina-DIN-intr-un-tablou-electric-1024x683.jpg 1024w, https:\/\/sercomelectric.ro\/blog\/wp-content\/uploads\/2026\/10\/5.-Cum-se-diferentiaza-MCB-RCCB-si-RCBO-montate-pe-o-sina-DIN-intr-un-tablou-electric-300x200.jpg 300w, https:\/\/sercomelectric.ro\/blog\/wp-content\/uploads\/2026\/10\/5.-Cum-se-diferentiaza-MCB-RCCB-si-RCBO-montate-pe-o-sina-DIN-intr-un-tablou-electric-768x512.jpg 768w, https:\/\/sercomelectric.ro\/blog\/wp-content\/uploads\/2026\/10\/5.-Cum-se-diferentiaza-MCB-RCCB-si-RCBO-montate-pe-o-sina-DIN-intr-un-tablou-electric.jpg 1200w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Sursa foto: Magnific.com<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La aparatele diferen\u021biale, <strong>In<\/strong> este curentul nominal admisibil, iar <strong>I\u0394n<\/strong> este curentul diferen\u021bial nominal de declan\u0219are. Nu confunda aceste marcaje. Tipul diferen\u021bialului, sensibilitatea \u0219i num\u0103rul de poli se aleg \u00een func\u021bie de sarcini, cerin\u021bele proiectului \u0219i instruc\u021biunile produc\u0103torului. Pentru a compara cele dou\u0103 solu\u021bii, cerceteaz\u0103 cu aten\u021bie gama aleas\u0103 de <a href=\"https:\/\/sercomelectric.ro\/111-intrerupatoare-diferentiale-rccb\">\u00eentrerup\u0103toare diferen\u021biale RCCB<\/a> \u0219i de <a href=\"https:\/\/sercomelectric.ro\/110-sigurante-automate-cu-diferential-rcbo\">siguran\u021be automate cu cu diferen\u021bial RCBO<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00centr-un comentariu la un videoclip despre echiparea tabloului, @ghiculescualex a descris \u00eenlocuirea provizorie a unor siguran\u021be fuzibile vechi cu un RCCB \u0219i dou\u0103 disjunctoare, men\u021bion\u00e2nd c\u0103 urma s\u0103 refac\u0103 ulterior \u00eentreaga instala\u021bie. Relatarea nu confirm\u0103 conformitatea configura\u021biei, dar arat\u0103 de ce alegerea unui aparat trebuie privit\u0103 \u00eempreun\u0103 cu starea cablurilor \u0219i cu planul complet al tabloului (@ghiculescualex, YouTube, 2023).<\/p>\n\n\n\n<h2 id=\"ce-verifici-cand-disjunctorul-declan\u0219eaza-repetat\" class=\"wp-block-heading\"><strong>Ce verifici c\u00e2nd disjunctorul declan\u0219eaz\u0103 repetat?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Declan\u0219area repetat\u0103 este un semn c\u0103 trebuie identificat\u0103 cauza, nu un motiv pentru a monta imediat un aparat cu amperaj mai mare sau cu alt\u0103 curb\u0103. Poate fi vorba despre suprasarcin\u0103, un defect la un consumator, scurtcircuit, curent rezidual sau o problem\u0103 a aparatului ori a conexiunilor. Momentul declan\u0219\u0103rii ofer\u0103 indicii, dar nu confirm\u0103 singur diagnosticul.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A\u0219adar:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Noteaz\u0103 ce consumatori func\u021bionau \u0219i dac\u0103 declan\u0219area apare la pornirea unui motor sau dup\u0103 o perioad\u0103 de utilizare.<\/li>\n\n\n\n<li>Nu rearma repetat aparatul \u0219i nu \u00eel bloca \u00een pozi\u021bia pornit.<\/li>\n\n\n\n<li>Nu deschide un tablou aflat sub tensiune \u0219i nu modifica leg\u0103turile. Cheam\u0103 un electrician pentru verificarea curentului, a izola\u021biei, a conexiunilor \u0219i a impedan\u021bei buclei de defect.<\/li>\n\n\n\n<li>Dac\u0103 observi \u00eenc\u0103lzire, miros de izola\u021bie ars\u0103 sau urme de \u00eennegrire, opre\u0219te folosirea circuitului \u0219i solicit\u0103 verificarea instala\u021biei.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Butonul de test se g\u0103se\u0219te pe anumite aparate diferen\u021biale, nu pe orice MCB. Folose\u0219te-l conform instruc\u021biunilor produc\u0103torului; verificarea prin buton nu \u00eenlocuie\u0219te m\u0103sur\u0103torile instala\u021biei. Pentru context despre componentele \u0219i \u00eentre\u021binerea tabloului, consult\u0103 ghidul nostru despre <a href=\"https:\/\/sercomelectric.ro\/blog\/tablou-electric-structura-functii-si-elemente-esentiale-intretinerea-corecta\">structura \u0219i \u00eentre\u021binerea tabloului electric<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00cen cele din urm\u0103, inscrip\u021bia de pe disjunctor este doar \u00eenceputul selec\u021biei. Curentul nominal, curba, capacitatea de rupere, num\u0103rul de poli \u0219i protec\u021bia diferen\u021bial\u0103 trebuie s\u0103 corespund\u0103 circuitului \u0219i m\u0103sur\u0103torilor din instala\u021bie. Pentru o instala\u021bie existent\u0103, verificarea de c\u0103tre personal calificat ofer\u0103 baza unei alegeri potrivite, f\u0103r\u0103 modific\u0103ri f\u0103cute doar ca s\u0103 nu mai declan\u0219eze aparatul.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Surse \u0219i referin\u021be:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Croft, T., Summers, W. I., &amp; Hartwell, F. P. (2021). American electricians&#8217; handbook (17th ed.). McGraw-Hill Education.<\/li>\n\n\n\n<li>Scaddan, B. (2021). Electrical installation work (10th ed.). Routledge.\u00a0<\/li>\n\n\n\n<li>Smeaton, R. W. (Ed.). (1998). Switchgear and control handbook (3rd ed.). McGraw-Hill.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Experien\u021be din comunitate:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Don_Costica, Forumul Softpedia, 10 decembrie 2022:<\/strong> a relatat c\u0103 polizorul \u0219i pompa submersibil\u0103 nu au func\u021bionat cu protec\u021bia B montat\u0103, iar dup\u0103 trecerea la C au func\u021bionat. Este o relatare individual\u0103, nu o recomandare de dimensionare. https:\/\/forum.softpedia.com\/topic\/1220460-recomandare-elemente-tablou-electric\/;<\/li>\n\n\n\n<li><strong>Consultant Electrice, Forum.MisiuneaCasa.ro, 24 martie 2024:<\/strong> a descris folosirea unor aparate B de 6 A pentru iluminat \u0219i de 10 A pentru anumite circuite de prize cu sarcini mici, f\u0103r\u0103 probleme \u00een instala\u021bia respectiv\u0103. https:\/\/forum.misiuneacasa.ro\/forum\/instalatii-incalzire-ventilare-conditionare-instalatii-electrice-si-instalatii-sanitare\/instalatii-electrice-iluminat-si-electrocasnice\/670113-sigurante-automate-curba-b-sau-c-pentru-instalatii-casnice;<\/li>\n\n\n\n<li><strong>@yomyh, YouTube, 2022:<\/strong> a \u00eentrebat despre \u00eenlocuirea unor aparate diferen\u021biale de dou\u0103 module cu variante mai compacte, \u00eentr-un tablou cu spa\u021biu limitat dup\u0103 finisaje. https:\/\/www.youtube.com\/watch?v=RmgEoXXVA90;<\/li>\n\n\n\n<li><strong>@ghiculescualex, YouTube, 2023:<\/strong> a descris un tablou ref\u0103cut provizoriu dup\u0103 \u00eenlocuirea siguran\u021belor fuzibile vechi \u0219i a precizat c\u0103 urma s\u0103 schimbe ulterior instala\u021bia complet. https:\/\/www.youtube.com\/watch?v=DFQ8ricJnY4.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u00centr-un tablou electric pentru o cl\u0103dire industrial\u0103, un spa\u021biu comercial sau o locuin\u021b\u0103, disjunctorul trebuie s\u0103 \u00eentrerup\u0103 circuitul c\u00e2nd curentul dep\u0103\u0219e\u0219te limitele stabilite pentru conductoare \u0219i aparat. Alegerea porne\u0219te de la sarcin\u0103 \u0219i cablu, apoi continu\u0103 cu curba de declan\u0219are, capacitatea de rupere, num\u0103rul de poli \u0219i coordonarea cu protec\u021biile din amonte.<\/p>\n","protected":false},"author":1,"featured_media":368,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ub_ctt_via":"","footnotes":""},"categories":[6],"tags":[],"class_list":["post-366","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sfaturi-utile"],"featured_image_src":"https:\/\/sercomelectric.ro\/blog\/wp-content\/uploads\/2026\/10\/Disjunctorul-electric-tablou-electric-modular-cu-disjunctoare-verificat-de-un-electrician.jpg","author_info":{"display_name":"administrator","author_link":"https:\/\/sercomelectric.ro\/blog\/author\/administrator"},"_links":{"self":[{"href":"https:\/\/sercomelectric.ro\/blog\/wp-json\/wp\/v2\/posts\/366","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sercomelectric.ro\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sercomelectric.ro\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sercomelectric.ro\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/sercomelectric.ro\/blog\/wp-json\/wp\/v2\/comments?post=366"}],"version-history":[{"count":2,"href":"https:\/\/sercomelectric.ro\/blog\/wp-json\/wp\/v2\/posts\/366\/revisions"}],"predecessor-version":[{"id":371,"href":"https:\/\/sercomelectric.ro\/blog\/wp-json\/wp\/v2\/posts\/366\/revisions\/371"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sercomelectric.ro\/blog\/wp-json\/wp\/v2\/media\/368"}],"wp:attachment":[{"href":"https:\/\/sercomelectric.ro\/blog\/wp-json\/wp\/v2\/media?parent=366"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sercomelectric.ro\/blog\/wp-json\/wp\/v2\/categories?post=366"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sercomelectric.ro\/blog\/wp-json\/wp\/v2\/tags?post=366"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}