{"id":13690,"date":"2022-11-03T14:00:00","date_gmt":"2022-11-03T13:00:00","guid":{"rendered":"https:\/\/rdcomponents.com\/site\/?p=13690"},"modified":"2026-06-03T10:56:47","modified_gmt":"2026-06-03T08:56:47","slug":"56-polvere-tra-i-contatti-e-conducibilita-elettrica","status":"publish","type":"post","link":"https:\/\/rdcomponents.com\/site\/2022\/11\/03\/56-polvere-tra-i-contatti-e-conducibilita-elettrica\/","title":{"rendered":"#56 &#8211; Polvere tra i contatti e conducibilit\u00e0 elettrica"},"content":{"rendered":"\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">Oggi facciamo un breve accenno a come un deposito di&nbsp;polvere&nbsp;tra&nbsp;i&nbsp;contatti&nbsp;possa compromettere il regolare funzionamento di un dispositivo bimetallico.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">La&nbsp;polvere&nbsp;negli ambienti domestici ha una composizione estremamente variegata. Difatti essa presenta combinazioni infinite di piccole quantit\u00e0 di polline di piante, materiali organici umani o animali come capelli o peli, fibre tessili, fibre di carta, residui minerali, sabbia, cellule della pelle umana e molto altro.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">Il materiale organico e buona parte dei componenti principali della&nbsp;polvere&nbsp;domestica non sono in genere conduttori di elettricit\u00e0, a meno che non vi sia&nbsp;polvere&nbsp;di metalli, o ossidi di metallo. In questo caso la&nbsp;polvere&nbsp;potrebbe diventare conduttore di elettricit\u00e0.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">I depositi di\u00a0polvere\u00a0sono un fattore che fa aumentare la possibilit\u00e0 di usura o di ossidazione dei\u00a0contatti. Inoltre, se la\u00a0polvere\u00a0si dovesse posizionare\u00a0tra\u00a0i\u00a0contatti\u00a0di un dispositivo bimetallico potrebbe trasformarsi in un elemento anomalo di conducibilit\u00e0 elettrica che causerebbe il malfunzionamento della macchina anche nel momento in cui i\u00a0contatti\u00a0fossero aperti. Oppure, nel caso in cui si trattasse di\u00a0polvere\u00a0non conduttiva, potrebbe rappresentare un ostacolo alla chiusura dei\u00a0contatti\u00a0aumentando sensibilmente la loro resistenza elettrica Questo sia che si tratti di intervento di un <a href=\"https:\/\/rdcomponents.com\/site\/2021\/12\/16\/16-termostati-con-contatti-normalmente-aperti\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>dispositivo normalmente aperto<\/strong><\/a>, sia di un <a href=\"https:\/\/rdcomponents.com\/site\/2022\/10\/20\/54-differenziale-e-ripristino\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>ripristino dopo l\u2019intervento<\/strong><\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">Ovviamente ci stiamo riferendo a quelle applicazioni in cui i dispositivi lavorano con tensioni e portate bassissime, difatti si parla di mV e mA. In questi casi anche solo un piccolo ostacolo, come un granello di&nbsp;polvere, potrebbe compromettere il loro funzionamento.&nbsp;<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"808\" height=\"485\" src=\"https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2022\/11\/Bimetallici-1.jpg\" alt=\"\" class=\"wp-image-13691\" style=\"width:606px;height:364px\" srcset=\"https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2022\/11\/Bimetallici-1.jpg 808w, https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2022\/11\/Bimetallici-1-300x180.jpg 300w, https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2022\/11\/Bimetallici-1-768x461.jpg 768w\" sizes=\"auto, (max-width: 808px) 100vw, 808px\" \/><\/figure>\n<\/div>\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">I contatti in oro nei TK24 e nei JRM<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">La quasi totalit\u00e0 dei termostati bimetallici e dei protettori termici hanno una custodia, o un corpo, a protezione del bimetallo e dei&nbsp;contatti. In realt\u00e0 si tratta per lo pi\u00f9 di un semplice grado di isolamento IP00 (vedremo pi\u00f9 avanti che cosa significa) e le possibilit\u00e0 che entri&nbsp;polvere&nbsp;e si sedimenti sui&nbsp;contatti&nbsp;non sono cos\u00ec insolite come potremmo essere portati a credere.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">Ecco che per ovviare a questo potenziale rischio su alcuni tipi di dispositivi bimetallici vengono utilizzati&nbsp;contatti&nbsp;placcati in oro, oppure in puro argento. Il motivo di tale scelta \u00e8 che si tratta di materiali nobili ad alta conducibilit\u00e0 elettrica. &nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">Ne avevamo parlato in \u201c<a href=\"https:\/\/rdcomponents.com\/site\/2022\/07\/14\/43-contatti-in-oro\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Contatti in oro<\/strong><\/a>\u201d e si era visto come questa soluzione fosse adottata per i termostati bimetallici\u00a0<a href=\"https:\/\/rdcomponents.com\/site\/termostati-bimetallici\/#tk24\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>TK24<\/strong><\/a>. Ma anche su un particolare tipo di protettore termico che R&amp;D Components \u00e8 in grado di fornire, ed \u00e8 la serie\u00a0<strong><a href=\"https:\/\/rdcomponents.com\/site\/altri\/#jrma\" target=\"_blank\" rel=\"noreferrer noopener\">JRMA<\/a>\u00a0<\/strong>e\u00a0<a href=\"https:\/\/rdcomponents.com\/site\/altri\/#jrmd\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>JRMD<\/strong><\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">La scelta del&nbsp;contatto&nbsp;placcato oro rispetto al&nbsp;contatto&nbsp;placcato in argento, \u00e8 dovuto al fatto che l\u2019oro non si ossida e non si corrode. L&#8217;argento \u00e8 invece un materiale pi\u00f9 usato per i&nbsp;contatti&nbsp;standard.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">La quantit\u00e0 utilizzata per placcare i&nbsp;contatti&nbsp;con l\u2019oro \u00e8 cos\u00ec minima, parliamo di unit\u00e0 di misura \u201cmicron\u201d, da rendere economicamente sostenibile e vantaggiosa questa operazione.&nbsp;<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"896\" height=\"537\" src=\"https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2022\/11\/JRMA-JRMD.jpg\" alt=\"\" class=\"wp-image-13692\" style=\"width:672px;height:403px\" srcset=\"https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2022\/11\/JRMA-JRMD.jpg 896w, https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2022\/11\/JRMA-JRMD-300x180.jpg 300w, https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2022\/11\/JRMA-JRMD-768x460.jpg 768w\" sizes=\"auto, (max-width: 896px) 100vw, 896px\" \/><\/figure>\n<\/div>\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Scarica l&#8217;articolo in versione stampabile cliccando qui sotto!<\/p>\n\n\n\n<div class=\"wp-block-file\"><a id=\"wp-block-file--media-00ea390b-f609-4cc9-acbe-b25c5ea3600d\" href=\"https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2022\/11\/56-POLVERE-TRA-I-CONTATTI-E-CONDUCIBILITA-ELETTRICA.jpg\" target=\"_blank\" rel=\"noreferrer noopener\">56-POLVERE-TRA-I-CONTATTI-E-CONDUCIBILITA-ELETTRICA<\/a><a href=\"https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2022\/11\/56-POLVERE-TRA-I-CONTATTI-E-CONDUCIBILITA-ELETTRICA.jpg\" class=\"wp-block-file__button wp-element-button\" download aria-describedby=\"wp-block-file--media-00ea390b-f609-4cc9-acbe-b25c5ea3600d\">Download<\/a><\/div>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Oggi facciamo un breve accenno a come un deposito di&nbsp;polvere&nbsp;tra&nbsp;i&nbsp;contatti&nbsp;possa compromettere il regolare funzionamento di un dispositivo bimetallico. La&nbsp;polvere&nbsp;negli ambienti domestici ha una composizione estremamente variegata. Difatti essa presenta combinazioni infinite di piccole quantit\u00e0 di polline di piante, materiali organici umani o animali come capelli&#8230;<\/p>\n","protected":false},"author":2,"featured_media":11995,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[239,236],"tags":[123,253,251,196],"class_list":["post-13690","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-funzionamento-tecnico","category-prodotti","tag-contatti","tag-jrm","tag-polvere","tag-tk24"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>#56 - Polvere tra i contatti e conducibilit\u00e0 elettrica -<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/rdcomponents.com\/site\/2022\/11\/03\/56-polvere-tra-i-contatti-e-conducibilita-elettrica\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"#56 - Polvere tra i contatti e conducibilit\u00e0 elettrica -\" \/>\n<meta property=\"og:description\" content=\"Oggi facciamo un breve accenno a come un deposito di&nbsp;polvere&nbsp;tra&nbsp;i&nbsp;contatti&nbsp;possa compromettere il regolare funzionamento di un dispositivo bimetallico. La&nbsp;polvere&nbsp;negli ambienti domestici ha una composizione estremamente variegata. 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La&nbsp;polvere&nbsp;negli ambienti domestici ha una composizione estremamente variegata. Difatti essa presenta combinazioni infinite di piccole quantit\u00e0 di polline di piante, materiali organici umani o animali come capelli...","og_url":"https:\/\/rdcomponents.com\/site\/2022\/11\/03\/56-polvere-tra-i-contatti-e-conducibilita-elettrica\/","og_site_name":"R&amp;d Components Srl","article_published_time":"2022-11-03T13:00:00+00:00","article_modified_time":"2026-06-03T08:56:47+00:00","og_image":[{"width":826,"height":463,"url":"https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2021\/09\/RD-Social-senza-contorno-e1717075823611.jpg","type":"image\/jpeg"}],"author":"Roberto Ferranti","twitter_card":"summary_large_image","twitter_misc":{"Scritto da":"Roberto Ferranti","Tempo di lettura stimato":"4 minuti"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/rdcomponents.com\/site\/2022\/11\/03\/56-polvere-tra-i-contatti-e-conducibilita-elettrica\/#article","isPartOf":{"@id":"https:\/\/rdcomponents.com\/site\/2022\/11\/03\/56-polvere-tra-i-contatti-e-conducibilita-elettrica\/"},"author":{"name":"Roberto Ferranti","@id":"https:\/\/rdcomponents.com\/site\/#\/schema\/person\/7094b2fd65b3d1dc44c7d0580d6a79cd"},"headline":"#56 &#8211; 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La&nbsp;polvere&nbsp;negli ambienti domestici ha una composizione estremamente variegata. Difatti essa presenta combinazioni infinite di piccole quantit\u00e0 di polline di piante, materiali organici umani o animali come capelli...","_links":{"self":[{"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/posts\/13690","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/comments?post=13690"}],"version-history":[{"count":1,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/posts\/13690\/revisions"}],"predecessor-version":[{"id":19060,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/posts\/13690\/revisions\/19060"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/media\/11995"}],"wp:attachment":[{"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/media?parent=13690"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/categories?post=13690"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/tags?post=13690"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}