{"id":10048,"date":"2023-07-10T13:50:11","date_gmt":"2023-07-10T05:50:11","guid":{"rendered":"https:\/\/lorentzzi.com\/?p=10048"},"modified":"2025-07-29T12:57:58","modified_gmt":"2025-07-29T04:57:58","slug":"contactor-vs-relay-9-key-differences-you-must-know","status":"publish","type":"post","link":"https:\/\/lorentzzi.com\/pt\/contactor-vs-relay-9-key-differences-you-must-know\/","title":{"rendered":"Contator versus rel\u00e9: 9 principais diferen\u00e7as que voc\u00ea deve conhecer"},"content":{"rendered":"
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Hoje vamos falar sobre as 9 diferen\u00e7as entre contatores e rel\u00e9s<\/span>. Observe que os rel\u00e9s aqui se referem aos rel\u00e9s eletromagn\u00e9ticos ou rel\u00e9s de uso geral<\/a><\/span> com os quais estamos familiarizados.<\/span><\/p>

Os contatores e os rel\u00e9s s\u00e3o dois atuadores comuns. Suas diferen\u00e7as se refletem principalmente na apar\u00eancia, estrutura, fun\u00e7\u00e3o, cen\u00e1rios de aplica\u00e7\u00e3o, tens\u00e3o e corrente de comuta\u00e7\u00e3o, custo etc.<\/span><\/p>

A seguir, explicaremos suas diferen\u00e7as, respectivamente.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Diferen\u00e7a de apar\u00eancia entre um contator e um rel\u00e9\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"Diferen\u00e7a\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Do ponto de vista da apar\u00eancia, <\/span>contatores<\/span><\/a><\/span> s\u00e3o geralmente maiores do que os rel\u00e9s e, consequentemente, mais pesados.<\/span><\/p>

Seu princ\u00edpio de funcionamento \u00e9 o mesmo, ou seja, quando a bobina \u00e9 energizada, \u00e9 gerado um campo magn\u00e9tico que, por sua vez, fecha ou abre os contatos, realizando assim o controle de conex\u00e3o e desconex\u00e3o da carga.<\/span><\/p>

O contator \u00e9 composto principalmente de uma bobina, uma armadura m\u00f3vel, uma armadura est\u00e1tica e contatos. Seus contatos s\u00e3o geralmente feitos de liga de cobre ou liga de prata, com contatos grandes, e esse material tem excelente resist\u00eancia ao desgaste e condutividade.<\/span><\/p>

Os rel\u00e9s eletromagn\u00e9ticos tamb\u00e9m incluem bobinas e contatos, e seus contatos tamb\u00e9m s\u00e3o feitos de liga de cobre ou liga de prata, com contatos pequenos, boa condutividade e caracter\u00edsticas de interrup\u00e7\u00e3o de baixa corrente.<\/span><\/p>

No conte\u00fado a seguir, explicaremos seus componentes em detalhes.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Estrutura<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Tamb\u00e9m h\u00e1 diferen\u00e7as na estrutura de contatores e rel\u00e9s. Os contatores geralmente incluem bobinas, n\u00facleos de ferro m\u00f3veis, n\u00facleos de ferro est\u00e1ticos, contatos principais e contatos auxiliares, <\/span>tampas de extin\u00e7\u00e3o de arco el\u00e9trico<\/b>, molas, etc.<\/span><\/p>

Os rel\u00e9s t\u00eam uma composi\u00e7\u00e3o relativamente simples, geralmente composta por bobinas, n\u00facleos de ferro, contatos, etc. Como a corrente e a tens\u00e3o permitidas s\u00e3o baixas, os rel\u00e9s eletromagn\u00e9ticos geralmente s\u00e3o <\/span>n\u00e3o equipados com tampas de extin\u00e7\u00e3o de arco el\u00e9trico<\/b>.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"Contator\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Aplicativos<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Os contatores s\u00e3o usados com frequ\u00eancia em cen\u00e1rios de trabalho de alta pot\u00eancia e carga pesada porque podem suportar altas correntes e tens\u00f5es.<\/span><\/p>

Por exemplo, na produ\u00e7\u00e3o industrial, os contatores s\u00e3o normalmente usados para acionar grandes motores. Esses motores precisam operar continuamente sob correntes e tens\u00f5es est\u00e1veis para garantir a produ\u00e7\u00e3o ininterrupta.<\/span><\/p>

Os contatores podem controlar efetivamente o fluxo de corrente e, quando usados em conjunto com um rel\u00e9 de sobrecarga t\u00e9rmica, podem proteger o motor contra danos causados por sobrecarga e curtos-circuitos.<\/span><\/p>

Em contrapartida, os rel\u00e9s eletromagn\u00e9ticos s\u00e3o mais adequados para cen\u00e1rios de controle de baixa corrente e alta frequ\u00eancia.<\/span><\/p>

Eles s\u00e3o usados com frequ\u00eancia em circuitos de controle de baixa corrente, especialmente nos campos de controle de equipamentos automatizados e instrumentos de medi\u00e7\u00e3o.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Tens\u00e3o e corrente de comuta\u00e7\u00e3o<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Nos circuitos el\u00e9tricos, os contatores s\u00e3o componentes usados com frequ\u00eancia que podem lidar com tens\u00e3o e corrente mais altas em compara\u00e7\u00e3o com os rel\u00e9s de uso geral.<\/span><\/p>

Em geral, o contator padr\u00e3o pode lidar com uma tens\u00e3o m\u00e1xima de 690 VCA e sua classifica\u00e7\u00e3o de corrente m\u00e1xima pode ser de at\u00e9 300 amperes.<\/span><\/p>

Por outro lado, o rel\u00e9 de uso geral \u00e9 normalmente classificado para at\u00e9 250 VCA, com uma capacidade m\u00e1xima de corrente inferior a 10 amperes.<\/span><\/p>

Portanto, a capacidade de comuta\u00e7\u00e3o do contator para tens\u00e3o e corrente \u00e9 muito maior do que a do rel\u00e9.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Precis\u00e3o e estabilidade<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Tanto os contatores quanto os rel\u00e9s apresentam boa estabilidade e alta precis\u00e3o quando utilizados para controlar cargas com baixa tens\u00e3o e corrente m\u00ednima.<\/span><\/p>

Em outras palavras, os dois produtos t\u00eam vida \u00fatil compar\u00e1vel. A vida \u00fatil de um contator \u00e9 de aproximadamente 1 milh\u00e3o de opera\u00e7\u00f5es, enquanto a vida \u00fatil de um rel\u00e9 eletromagn\u00e9tico \u00e9 de cerca de 100.000 opera\u00e7\u00f5es.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Ru\u00eddo\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Se voc\u00ea j\u00e1 usou esses dois produtos antes, perceber\u00e1 que ambos geram ru\u00eddo quando o sinal de controle \u00e9 aplicado e os contatos s\u00e3o fechados.<\/span><\/p>

Embora haja uma pequena diferen\u00e7a nos n\u00edveis de ru\u00eddo: o contator \u00e9 um pouco mais barulhento do que o rel\u00e9 quando opera, a diferen\u00e7a \u00e9 quase insignificante.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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M\u00e9todo de controle<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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O m\u00e9todo de controle do contator e do rel\u00e9 \u00e9 o mesmo que o nosso <\/span>rel\u00e9 de estado s\u00f3lido<\/span><\/a><\/span>Os sinais de controle podem ser de tens\u00e3o CC ou CA.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\"Rel\u00e9\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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O princ\u00edpio de funcionamento de ambos \u00e9 o seguinte: quando o sinal de controle externo, como 12 VCC ou 220 VCA, \u00e9 aplicado ao terminal de controle, o contator ou o rel\u00e9 pode fechar o circuito para realizar o controle de ligar ou desligar a carga.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Confiabilidade<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Basicamente, n\u00e3o h\u00e1 diferen\u00e7a na confiabilidade de contatores e rel\u00e9s.<\/span><\/p>

Quando a frequ\u00eancia de opera\u00e7\u00e3o e a corrente de carga dos contatores e rel\u00e9s s\u00e3o altas, ocorrem problemas como mau contato, ades\u00e3o de contato e interfer\u00eancia eletromagn\u00e9tica (como evitar essa interfer\u00eancia, leia este artigo): <\/span>Como reduzir EMI, picos de tens\u00e3o e arcos voltaicos<\/span><\/a><\/span> ) est\u00e3o propensos a ocorrer, o que afetar\u00e1 a estabilidade e a confiabilidade do equipamento.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Custo<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Os contatores t\u00eam uma capacidade de carga maior do que os rel\u00e9s. No entanto, isso tamb\u00e9m significa que os contatores normalmente t\u00eam materiais e processos de fabrica\u00e7\u00e3o mais complexos, o que contribui para o seu custo mais alto.<\/span><\/p>

Em contrapartida, os rel\u00e9s eletromagn\u00e9ticos t\u00eam custo relativamente baixo. Isso pode ser atribu\u00eddo \u00e0 sua miniaturiza\u00e7\u00e3o e ao desempenho el\u00e9trico est\u00e1vel, o que pode permitir uma produ\u00e7\u00e3o mais eficiente ou menores requisitos de material.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Conclus\u00e3o<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Resumindo, um contator \u00e9 um tipo de rel\u00e9, tem as mesmas caracter\u00edsticas do rel\u00e9, mas ainda h\u00e1 10 diferen\u00e7as importantes entre o contator e o rel\u00e9, mas a principal diferen\u00e7a \u00e9 que o contator pode suportar uma tens\u00e3o mais alta e uma corrente maior, com maior capacidade de carga, mas o pre\u00e7o tamb\u00e9m \u00e9 mais alto.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\"Lorentzzi\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Como uma das principais for\u00e7as na produ\u00e7\u00e3o de todos os tipos de rel\u00e9s, especialmente <\/span>rel\u00e9s de estado s\u00f3lido<\/span><\/a><\/span>, <\/span>Lorentzzi<\/strong><\/span><\/span><\/a> A nossa empresa n\u00e3o apenas fornece produtos de alta qualidade, mas tamb\u00e9m solu\u00e7\u00f5es para os nossos clientes. Se estiver construindo um projeto e quiser obter orienta\u00e7\u00e3o profissional, entre em contato conosco ou envie suas perguntas para <\/span>shonxu@lorentzzi.com<\/span><\/a>nossa equipe responder\u00e1 em at\u00e9 24 horas.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

Today we are going to talk about the 9 differences between contactors and relays. Note that the relays here refer to the electromagnetic relays or general purpose relays we are familiar with. Contactors and relays are two common actuators. Their differences are mainly reflected in appearance, structure, function, application scenarios, switching voltage and current, cost […]<\/p>\n","protected":false},"author":1,"featured_media":17580,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"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":"disabled","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":[117],"tags":[],"class_list":["post-10048","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-accessories"],"yoast_head":"\nContactor Vs Relay: 9 Key Differences You Must Know<\/title>\n<meta name=\"description\" content=\"Contactors and relays are two common electrical control devices, there are 10 differences between a contactor and a relay.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/lorentzzi.com\/pt\/contactor-vs-relay-9-key-differences-you-must-know\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" 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