{"id":4097,"date":"2026-09-05T19:15:30","date_gmt":"2026-09-05T19:15:30","guid":{"rendered":"https:\/\/huyuglobal.com\/?p=4097"},"modified":"2026-09-05T19:16:46","modified_gmt":"2026-09-05T19:16:46","slug":"what-is-a-circuit-breaker","status":"publish","type":"post","link":"https:\/\/huyuglobal.com\/pt\/blog\/what-is-a-circuit-breaker\/","title":{"rendered":"O que \u00e9 um Disjuntor? Tipos, Como Eles Funcionam"},"content":{"rendered":"

Em quase todas as casas, empresas ou f\u00e1bricas h\u00e1 um elemento cr\u00edtico de seguran\u00e7a que a maioria das pessoas considera garantido; o Painel El\u00e9trico cont\u00e9m nossas emo\u00e7\u00f5es (tanto as boas quanto as ruins), bem como alguns interruptores que provavelmente nunca foram utilizados at\u00e9 que algo aconte\u00e7a, como uma sobretens\u00e3o ou algu\u00e9m trope\u00e7ar no aspirador de p\u00f3. Este \u00e9 o mesmo local onde um aparelho pode \u201cqueimar\u201d e resultar na perda de energia de toda a sala, incluindo todos os itens el\u00e9tricos \u2014 este interruptor \u00e9 conhecido como Disjuntor. De fato, embora possam n\u00e3o ser muito usados no dia a dia, os Disjuntores s\u00e3o o equipamento mais importante no seu sistema el\u00e9trico.<\/p>\n

\n

Em conclus\u00e3o, os disjuntores evitam que quantidades excessivas de eletricidade sejam transmitidas, cortando o fornecimento de energia el\u00e9trica se houver uma sobrecorrente devido a uma carga excessiva ou se o usu\u00e1rio criar uma situa\u00e7\u00e3o em que o circuito el\u00e9trico esteja defeituoso. Os mecanismos usados nos disjuntores permitem que os usu\u00e1rios desarmem a energia excessiva sem precisar comprar novos fus\u00edveis; no entanto, uma vez que um disjuntor tenha sido desarmado, ele deve ser religado antes de ser reutilizado. Os tipos de classifica\u00e7\u00f5es para disjuntores s\u00e3o: a quantidade de corrente que o disjuntor pode suportar, as classifica\u00e7\u00f5es de tens\u00e3o, a classifica\u00e7\u00e3o para interrup\u00e7\u00e3o, o n\u00famero nominal de polos em um disjuntor e a classifica\u00e7\u00e3o para caracter\u00edsticas de disparo.<\/p>\n<\/blockquote>\n

\"What<\/p>\n

O que exatamente \u00e9 um disjuntor?<\/h2>\n

O Disjuntor \u00e9 um componente el\u00e9trico que se conecta tanto ao sistema de distribui\u00e7\u00e3o el\u00e9trica (Fonte de Energia) quanto \u00e0 distribui\u00e7\u00e3o de eletricidade atrav\u00e9s da fia\u00e7\u00e3o el\u00e9trica para dispositivos el\u00e9tricos em todo o edif\u00edcio (Luzes, Tomadas). As principais fun\u00e7\u00f5es do Disjuntor incluem monitorar o sistema el\u00e9trico e desconectar o fornecimento el\u00e9trico daquele circuito quando detecta uma quantidade insegura de corrente. O Disjuntor tamb\u00e9m fornece prote\u00e7\u00e3o ao fio ao redor contra superaquecimento, protege os dispositivos el\u00e9tricos conectados ao circuito contra danos e, finalmente, protege as pessoas que possam entrar em contato com o circuito contra choques ou queimaduras.<\/p>\n

Uma forma de visualizar o Disjuntor \u00e9 pensar em como um seguran\u00e7a operaria na frente de uma boate. Durante uma noite normal, o seguran\u00e7a \u201cdeixaria\u201d os convidados normais, do dia a dia, passarem sem problemas. Se, no entanto, houvesse uma multid\u00e3o inesperada de pessoas que invadisse a porta (uma sobretens\u00e3o indesejada de corrente), ou se algu\u00e9m tentasse for\u00e7ar a entrada na boate (no caso de um curto-circuito), o seguran\u00e7a imediatamente fecharia a porta com for\u00e7a. O seguran\u00e7a continua dispon\u00edvel para desempenhar sua fun\u00e7\u00e3o de manter os convidados fora de perigo (todo o prop\u00f3sito de usar um Disjuntor em vez de um fus\u00edvel). Uma vez que a situa\u00e7\u00e3o se estabilize, o seguran\u00e7a pode permitir que outro convidado entre na boate, assim como o Disjuntor pode ser resetado para permitir que o fornecimento el\u00e9trico flua novamente.<\/p>\n

O Disjuntor existe h\u00e1 muito tempo. Thomas Edison patenteou seu primeiro Sistema Autom\u00e1tico de Interrup\u00e7\u00e3o de Circuito em 1879 para usar como parte dos sistemas de ilumina\u00e7\u00e3o que desenvolveu. Os primeiros tipos de l\u00e2mina de faca e cartucho come\u00e7aram a aparecer por volta de 1900. Em 1924, Hugo Stotz projetou e construiu o primeiro Disjuntor Miniatura Termomagn\u00e9tico verdadeiro, combinando ambos os mecanismos de disparo em um \u00fanico dispositivo pequeno. O design de 1924 ainda \u00e9 usado hoje, e os Disjuntores Miniatura dispon\u00edveis para compra atualmente utilizam exatamente as mesmas duas fun\u00e7\u00f5es dos Disjuntores originais.<\/p>\n

Como funciona um disjuntor?<\/h2>\n

Os dois sensores detectam condi\u00e7\u00f5es de sobrecorrente e curto-circuito instant\u00e2neo, respectivamente. O sensor t\u00e9rmico detecta corrente excessiva por meio de dispositivos sens\u00edveis \u00e0 temperatura (termistores) que se tornam inutiliz\u00e1veis quando excedem sua temperatura nominal permitida. O sensor magn\u00e9tico detecta a presen\u00e7a de uma grande quantidade de corrente (como a encontrada em curtos-circuitos). Al\u00e9m de detectar condi\u00e7\u00f5es de sobrecorrente, o sensor t\u00e9rmico protege contra danos ao equipamento causados por aquecimento excessivo devido a situa\u00e7\u00f5es prolongadas de sobrecarga, enquanto o sensor magn\u00e9tico protege contra danos ao equipamento devido a n\u00edveis de corrente que sobem rapidamente em condi\u00e7\u00f5es de curto-circuito.<\/p>\n

O design termomagn\u00e9tico do disjuntor \u00e9 o mais amplamente utilizado. O mecanismo de disparo em muitos interruptores el\u00e9tricos opera com o mesmo princ\u00edpio desse design de disjuntor; quando a corrente excede um certo n\u00edvel, ele aciona um circuito eletr\u00f4nico que abre o interruptor. Alguns mecanismos eletr\u00f4nicos de disparo permitem que o usu\u00e1rio abra ou feche manualmente o circuito usando um interruptor de alavanca. Em contraste, a maioria dos disjuntores el\u00e9tricos usa mecanismos de disparo mec\u00e2nicos que abrem e fecham o circuito automaticamente.<\/p>\n\n\n\n\n\n
Tipo de falha<\/th>\nO que acontece<\/th>\nElemento de detec\u00e7\u00e3o<\/th>\nTempo de resposta<\/th>\n<\/tr>\n
Sobrecarga (por exemplo, muitos aparelhos em um circuito)<\/td>\nCorrente excede modestamente a classifica\u00e7\u00e3o; o calor se acumula ao longo de segundos ou minutos<\/td>\nFita bimet\u00e1lica que se dobra ao aquecer, liberando o trinco<\/td>\nSegundos a minutos \u2014 lento e dependente do calor, o que \u00e9 intencional<\/td>\n<\/tr>\n
Curto-circuito (fio fase toca neutro ou terra)<\/td>\nPicos de corrente para centenas ou milhares de amperes quase instantaneamente<\/td>\nSolenoide eletromagn\u00e9tico que puxa a trava para abrir<\/td>\nMeio ciclo ou menos (cerca de 8-16 milissegundos)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

O atraso na caracter\u00edstica t\u00e9rmica de um disjuntor \u00e9 uma caracter\u00edstica desej\u00e1vel, n\u00e3o uma falha. Quando um motor \u00e9 ligado, ele momentaneamente puxa uma corrente v\u00e1rias vezes maior que sua corrente normal de opera\u00e7\u00e3o; portanto, a l\u00e2mina bimet\u00e1lica deve ter sido submetida a per\u00edodos prolongados de calor antes que o disjuntor desarme (abra os contatos) para que a corrente de partida n\u00e3o cause desligamentos indesejados. No entanto, a for\u00e7a eletromagn\u00e9tica gerada por um curto-circuito direto \u00e9 t\u00e3o forte que far\u00e1 com que o disjuntor desarme dentro de um ciclo de CA antes que a fia\u00e7\u00e3o possa superaquecer e\/ou causar um inc\u00eandio.<\/p>\n

Abrir os contatos de um disjuntor \u00e9 apenas uma parte de interromper o fluxo de corrente pesada. Quando um disjuntor interrompe o fluxo de corrente pesada, o processo de arco el\u00e9trico ioniza o ar entre os contatos \u00e0 medida que eles se abrem e cria um arco el\u00e9trico que continuar\u00e1 a conduzir a menos que seja interrompido. Esta \u00e9 a raz\u00e3o pela qual os disjuntores s\u00e3o projetados com controle de arco para que possam esticar, resfriar e separar os arcos el\u00e9tricos dos pontos de interrup\u00e7\u00e3o. Os disjuntores s\u00e3o classificados com uma capacidade de interrup\u00e7\u00e3o (medida em kA) que ajuda a determinar a corrente m\u00e1xima de falha que pode ser interrompida com seguran\u00e7a pelo disjuntor. Um disjuntor residencial normalmente tem uma capacidade de interrup\u00e7\u00e3o de 5-10 kA, enquanto um disjuntor industrial em caixa moldada ter\u00e1 uma classifica\u00e7\u00e3o de 25-100 kA. Selecionar um disjuntor com uma capacidade de interrup\u00e7\u00e3o inferior \u00e0 corrente de falha dispon\u00edvel \u00e9 uma viola\u00e7\u00e3o grave de seguran\u00e7a e n\u00e3o limpar\u00e1 as falhas, podendo explodir.<\/p>\n

\"How<\/p>\n

Curvas de disparo: o que significam as letras B, C e D<\/h2>\n

Disjuntores Miniatura (MCBs) possuem uma letra antes da corrente nominal (B16, B32 etc.) para indicar a curva de disparo. A curva de disparo determina quanto sobrecarga (disparo instant\u00e2neo) o disparo magn\u00e9tico (disparo instant\u00e2neo) tolerar\u00e1 antes de atuar. Usar a curva de disparo correta \u00e9 importante ao selecionar o MCB adequado para a carga porque:<\/p>\n\n\n\n\n\n\n\n
Curva<\/th>\nLimite de disparo instant\u00e2neo<\/th>\nCargas t\u00edpicas<\/th>\nNotas<\/th>\n<\/tr>\n
Tipo B<\/td>\n3-5 \u00d7 corrente nominal<\/td>\nCargas resistivas: ilumina\u00e7\u00e3o, aquecedores, tomadas em ambientes residenciais<\/td>\nMais sens\u00edvel; n\u00e3o indicado para motores ou transformadores<\/td>\n<\/tr>\n
Tipo C<\/td>\n5-10 \u00d7 corrente nominal<\/td>\nPequenos motores, drivers fluorescentes e LED, cargas comerciais gerais<\/td>\nA escolha mais comum para uso geral<\/td>\n<\/tr>\n
Tipo D<\/td>\n10-20 \u00d7 corrente nominal<\/td>\nTransformadores, motores grandes, equipamentos de soldagem, m\u00e1quinas com alta corrente de partida<\/td>\nToler\u00e2ncia a grandes picos de partida sem disparos indesejados<\/td>\n<\/tr>\n
Tipo K \/ Z<\/td>\nEspecializados<\/td>\nProte\u00e7\u00e3o de semicondutores (Z), prote\u00e7\u00e3o de motores (K)<\/td>\nAplica\u00e7\u00f5es industriais de nicho<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Usar a curva de disparo correta para uma carga pode ser o fator decisivo para receber prote\u00e7\u00e3o utiliz\u00e1vel ao usar um MCB ou ficar frustrado com o n\u00famero de vezes que voc\u00ea \u00e9 desligado por um MCB. Se um circuito de motor grande usar um MCB Tipo B, ele pode disparar continuamente se voc\u00ea precisar ligar seu motor grande; se um circuito de ilumina\u00e7\u00e3o usar um MCB Tipo D, e voc\u00ea experimentar uma falha, pode levar muito tempo para disparar e proteger a fia\u00e7\u00e3o. Tenha cuidado para garantir que o MCB tenha a curva de disparo adequada para a carga que est\u00e1 protegendo; se voc\u00ea n\u00e3o tiver certeza, geralmente \u00e9 mais seguro usar a pr\u00f3xima curva de disparo superior do que usar uma classifica\u00e7\u00e3o de corrente mais alta na mesma curva de disparo.<\/p>\n

Os principais tipos de disjuntores<\/h2>\n

Os disjuntores podem ser divididos em diferentes categorias com base em como foram fabricados (tipo de constru\u00e7\u00e3o), fun\u00e7\u00e3o (como funcionam), classifica\u00e7\u00e3o de tens\u00e3o e n\u00famero de polos. A seguir est\u00e3o os diferentes tipos de disjuntores que voc\u00ea ver\u00e1 em uso.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n
Tipo<\/th>\nNome completo<\/th>\nClassifica\u00e7\u00e3o t\u00edpica<\/th>\nOnde voc\u00ea o encontra<\/th>\n<\/tr>\n
MCB<\/td>\nDisjuntor Miniatura<\/td>\n0,5-125 A<\/td>\nUnidades consumidoras residenciais, quadros de distribui\u00e7\u00e3o comerciais pequenos<\/td>\n<\/tr>\n
MCCB<\/td>\nDisjuntor em Caixa Moldada<\/td>\n16-1,600 A<\/td>\nCommercial panels, industrial feeders, large HVAC and machinery<\/td>\n<\/tr>\n
ACB<\/td>\nDisjuntor a Ar<\/td>\n400-6,300 A<\/td>\nIndustrial switchgear, generator and main incomers, data centers<\/td>\n<\/tr>\n
VCB<\/td>\nVacuum Circuit Breaker<\/td>\nUp to 40 kV class<\/td>\nMedium-voltage distribution, substations, motor switching<\/td>\n<\/tr>\n
RCCB \/ ELCB<\/td>\nResidual Current Circuit Breaker \/ Earth Leakage<\/td>\n25-100 A, 30-300 mA sensitivity<\/td>\nShock protection on sockets and wet areas<\/td>\n<\/tr>\n
RCBO<\/td>\nResidual Current Breaker with Overcurrent<\/td>\n6-63 A<\/td>\nCombines MCB + RCCB in one module<\/td>\n<\/tr>\n
GFCI \/ AFCI<\/td>\nGround-Fault \/ Arc-Fault Circuit Interrupter<\/td>\n15-50 A<\/td>\nUS kitchens, baths, outdoors (GFCI); bedrooms, living areas (AFCI)<\/td>\n<\/tr>\n
SF6 \/ Oil<\/td>\nGas- or oil-insulated breaker<\/td>\nAlta tens\u00e3o<\/td>\nTransmission networks, high-voltage substations<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

There are two major points of confusion: First, RCCBs and RCBOs are not overcurrent protective devices as most people think of them; rather, they are devices that detect leakage current to ground (through either a person or the insulation), so they will interrupt the circuit within approximately thirty milliseconds after the leakage has occurred. Therefore, under current codes, all sockets should have RCCBs or RCBOs installed. Secondly, in U.S. residential wiring, the functions of AFCI’s and GFCI’s are often combined within the same device when required in bedrooms\/living spaces under current code provisions.The relationship between these residual-current and overcurrent devices is explained in more depth in our RCCB vs RCBO guide<\/a>.<\/p>\n

Breakers can have a single-pole (one 120V leg), double-pole (two legs for 240V appliances\/mains in North America) or three- or four-pole (three phases of industrial\/commercial power) configurations. Single-pole breakers provide overcurrent protection for 120 Volt branch circuits; Double-pole breakers provide overcurrent protection for 240 Volt loads such as clothes dryers, ranges, water heaters and Electric Vehicle chargers and will trip both legs at the same time. Many of the most common mistakes made by DIY homeowners are due to improper selection of the number of poles, hence it is recommended that you have an experienced professional perform panel installations\/housing upgrades as they have completed this process hundreds of times before.<\/p>\n

\"Os<\/p>\n

Circuit breaker vs fuse: what is the difference?<\/h2>\n

Apart from serving the same purpose to provide protection for wiring and equipment, each type has a unique method of operation. A fuse’s ability to protect against an overload condition is through a metal conductor that melts at an amperage above its capacity, creating a physical break in the electrical circuit. In a breaker, this process is completed through mechanical movement of the switch. This difference creates the foundation for the comparisons between these two types of protective devices.<\/p>\n\n\n\n\n\n\n\n\n\n\n
Property<\/th>\nFus\u00edvel<\/th>\nDisjuntor<\/th>\n<\/tr>\n
After a trip<\/td>\nElement destroyed \u2014 must be replaced<\/td>\nReset by flipping the handle \u2014 reusable<\/td>\n<\/tr>\n
Response speed<\/td>\nExtremely fast (good current limiting)<\/td>\nFast, but slightly slower than an equivalent fuse on very high faults<\/td>\n<\/tr>\n
Tamper protection<\/td>\nEasy to defeat by fitting a larger fuse or a coin behind one<\/td>\nHarder to defeat; trips recur visibly<\/td>\n<\/tr>\n
Resettable remotely?<\/td>\nNo \u2014 physical replacement<\/td>\nSome industrial types can be reclosed electrically<\/td>\n<\/tr>\n
Cost per event<\/td>\nCheap part, but every fault costs a new fuse<\/td>\nHigher first cost, near-zero cost per trip<\/td>\n<\/tr>\n
Discrimination\/selectivity<\/td>\nGood; fuses coordinate well in series<\/td>\nNeeds careful grading between upstream and downstream units<\/td>\n<\/tr>\n
Where preferred<\/td>\nSemiconductor protection, high-fault-capacity industrial spots, some automotive\/marine<\/td>\nEverywhere else \u2014 homes, commercial, industrial distribution<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Most users would conclude that an upgrade from a fuse box to a circuit breaker panel is the best return on their investment. A fuse does not provide any indication of repetitive overloading of the circuit and therefore provides opportunities for unsafe and\/or hazardous repairs; on the other hand, with a circuit breaker, the user can clearly identify the circuit that tripped and can simply reset it. Circuit breakers also offer ground fault and arc fault protection, features that cannot be offered by any type of fuse. In some instances, a fuse will out-perform a circuit breaker, such as when dealing with very high fault currents or the need for rapid current limitation while protecting sensitive electrical equipment; however, in buildings, circuit breakers have been the best choice for many years.<\/p>\n

Circuit breaker vs switch: what is the difference?<\/h2>\n

A breaker handle is often mistaken for a switch because they are similar, but they are different types of devices. A switch (e.g., light switch, isolator, contactor) is intended to be regularly used or operated (you will turn it on\/off many times), and it does not have any ability to sense. A circuit breaker, on the other hand, is intended for infrequent service and is specifically designed to automatically trip when it detects a fault by automatically shutting off the current.<\/p>\n

As a result of these differences, there are two basic rules. First, a switch does not protect you from faults; it can only control your circuit, and therefore the circuit that comes from a switch must be protected by other devices upstream of the switch. Second, a circuit breaker is not intended for daily switching; its contacts are not designed for thousands of operates, and each time you manually trip it, the life expectancy of that breaker is decreased. If you want to have a switching device and also provide some form of protection, the ideal product would be a switch disconnector with a fuse or circuit breaker, or a motor protective circuit breaker (for machine circuits). On the high-voltage side, this difference is also found in substations, where they use separate disconnectors for switching (they will only switch when there is no current) and circuit breakers for interrupting fault currents.<\/p>\n

Main breaker vs branch circuit breaker: what is the difference?<\/h2>\n

People frequently confuse the two types of breakers in a breaker panel (the main and the branch) because they both disconnect electricity from a panel; however, they serve entirely different functions. The main breaker disconnects power to the entire panel from the electrical utility, while branch breakers (the long rows of 15- and 20-amp handles) protect each individual circuit (e.g., kitchen, bedrooms, AC unit, dryer). Depending on the size of a person\u2019s home and how much electricity is used each day, many people will find that the main breaker will be rated between 100-200 amps in a home.<\/p>\n

Understanding the distinction between these two breakers is vital because of how they help protect against electrical shock and fire. The main breaker protects the service conductors, giving firefighters and\/or electricians a single safe way to disconnect power from a building, whereas branch breakers protect the smaller wires located within walls that run to each particular room; therefore, when an electrical short or failure occurs within a branch breaker, it can potentially only take one room out of service instead of the entire house. When an individual hears “the main breaker tripped,” it usually indicates that either the total electricity usage exceeded the service capacity or that a significant electrical fault occurred between the main and branch breakers. Therefore, before an individual resets the main breaker, they should unplug enough appliances or electronic devices to bring the total electricity consumption below the maximum rating of the breaker panel.<\/p>\n

\"Which<\/p>\n

Which brands make circuit breakers?<\/h2>\n

There are two distinct categories of manufacturers in the circuit breaker industry: global players with an extensive presence in North America and Europe, and companies focused on niche products where their certified products can be found across the globe.<\/p>\n\n\n\n\n\n\n\n\n\n\n
Marca<\/th>\nHome market<\/th>\nKnown for<\/th>\n<\/tr>\n
Square D (Schneider Electric)<\/td>\nUS \/ France<\/td>\nQO and Homeline panels \u2014 the most widely installed residential breakers in North America<\/td>\n<\/tr>\n
Eaton (incl. Cutler-Hammer)<\/td>\nUS \/ Ireland<\/td>\nBR and CH series, strong commercial and industrial line<\/td>\n<\/tr>\n
Siemens<\/td>\nAlemanha<\/td>\nHuge industrial and residential portfolio, MP\/QP residential line<\/td>\n<\/tr>\n
ABB<\/td>\nSwitzerland \/ Sweden<\/td>\nTmax MCCB range, global industrial standard, SACE breakers<\/td>\n<\/tr>\n
Leviton<\/td>\nUS<\/td>\nResidential breakers plus a growing smart\/connected breaker line<\/td>\n<\/tr>\n
General Electric (now part of ABB\/Smart Breaker brands)<\/td>\nUS<\/td>\nLegacy THQL\/THQB panels still common in older homes<\/td>\n<\/tr>\n
Legrand \/ Hager \/ Chint \/ HUYU and similar certified global manufacturers<\/td>\nEurope \/ China<\/td>\nFull MCB\/MCCB\/RCBO ranges certified to IEC 60898 and IEC 60947, supplying OEM and project markets worldwide<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

When purchasing circuit breakers, the most important rule regarding product compatibility is that, in North America, circuit breakers are panel-specific. As an example, a Square D breaker will not fit an Eaton panel, and trying to install one in a panel that it is not intended for creates not only a code violation, but also a legitimate fire hazard. To avoid this issue, simply match the replacement circuit breaker to the manufacturer’s name and series of the existing panel (see our Eaton vs. Cutler-Hammer Reference Guide for product compatibility) or, if you choose to switch brands, you can simply replace the entire panel. Circuit breakers from different manufacturers are compatible and can be mounted on DIN-rail tracks in markets outside of North America (i.e., IEC markets), and therefore companies like HUYU can distribute their certified miniature circuit breakers (MCBs) in over 100 countries. For industrial and project clients, the certification is much more important than the product logo; the certification for North America is UL 489 for circuit breakers, IEC 60898 for MCBs, IEC 60947-2 for molded case circuit breakers (MCCBs) and air circuit breakers (ACBs), and the certified test reports for those certifications.<\/p>\n

How much do circuit breakers cost?<\/h2>\n

Pricing for Breaker varies more than many other types of electrical components because circuit breakers can range from $6 (residential spare) to over $100,000 (transmission). Therefore, when creating a budget for a project, it helps to have a breakdown of the possible price ranges in each category for each year leading up to 2026:<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
Tipo de disjuntor<\/th>\nPart cost (typical)<\/th>\nInstalled cost (electrician)<\/th>\n<\/tr>\n
Standard single-pole thermal-magnetic (15-30 A)<\/td>\n$6-18<\/td>\n$130-250 including service call<\/td>\n<\/tr>\n
Double-pole (30-100 A)<\/td>\n$10-40<\/td>\n$150-300<\/td>\n<\/tr>\n
GFCI breaker<\/td>\n$40-100<\/td>\n$200-350<\/td>\n<\/tr>\n
AFCI or combination AFCI\/GFCI<\/td>\n$30-100<\/td>\n$175-350<\/td>\n<\/tr>\n
Smart breaker with energy monitoring<\/td>\n$50-300+<\/td>\n$250-500<\/td>\n<\/tr>\n
MCB (IEC, 6-63 A, DIN-rail)<\/td>\n$3-25<\/td>\nVaries by market<\/td>\n<\/tr>\n
MCCB (100-1,600 A)<\/td>\n$45-1,600+<\/td>\nProject-priced<\/td>\n<\/tr>\n
ACB (630-6,300 A)<\/td>\n$800-5,000+<\/td>\nProject-priced<\/td>\n<\/tr>\n
Medium\/high-voltage breaker<\/td>\n$5,000-100,000+<\/td>\nSubstation projects<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

The big price drivers are amperage, interrupting rating, protection features, and brand. A basic 20 A thermal-magnetic breaker at $6-12 versus a combination AFCI\/GFCI unit at $50-100 is roughly a five-to-eight-times multiplier \u2014 justified by the microprocessors and sensors inside the smart unit. The full cost picture \u2014 including panel replacement and when a $200 breaker swap turns into a $2,000-4,000 panel upgrade \u2014 is detailed in our circuit breaker replacement cost guide<\/a>.<\/p>\n

\"How<\/p>\n

How to choose the right circuit breaker<\/h2>\n

To select a new circuit breaker, follow these five steps IN ORDER: Each step limits and restricts your options for the next step.<\/p>\n