{"id":13110,"date":"2022-07-14T14:00:00","date_gmt":"2022-07-14T12:00:00","guid":{"rendered":"https:\/\/rdcomponents.com\/site\/?p=13110"},"modified":"2026-06-03T10:56:47","modified_gmt":"2026-06-03T08:56:47","slug":"43-contatti-in-oro","status":"publish","type":"post","link":"https:\/\/rdcomponents.com\/site\/2022\/07\/14\/43-contatti-in-oro\/","title":{"rendered":"#43 &#8211; Contatti in oro"},"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 vi sottopongo un caso particolare dove il termostato bimetallico potrebbe avere difficolt\u00e0 ad intervenire, a causa di un passaggio della corrente cos\u00ec bassa da non poter riuscire a vincere la resistenza di isolamento tra i&nbsp;contatti.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">Ci sono infatti applicazioni in cui la corrente che attraversa i&nbsp;contatti&nbsp;del termostato \u00e8 cos\u00ec bassa che si parla di un segnale di pochi milliampere. Questo potrebbe non essere rilevato perch\u00e9 per esempio i&nbsp;contatti&nbsp;non sono predisposti per una corrente cos\u00ec bassa o perch\u00e9 si sono leggermente ossidati nell\u2019operativit\u00e0.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">Naturalmente questa non \u00e8 una circostanza che arriva inaspettata ma \u00e8 parte del progetto previsto dall\u2019applicazione e dal ruolo che il termostato deve avere e quindi \u00e8 gi\u00e0 noto che il dispositivo dovr\u00e0 soddisfare determinate performance.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">Quali sono le soluzioni che offrono i produttori?&nbsp;La soluzione pi\u00f9 usata per garantire una minore resistenza sui&nbsp;contatti&nbsp;\u00e8 quella di placcarli in&nbsp;oro. Tranquilli, sono minuscole particelle, non crediate di poter aprire il termostato e di dedicarvi all\u2019oro. Il termine usato in inglese \u00e8 Gold Flash&nbsp;Contact, giusto per sottolineare la quantit\u00e0 minima di materiale impiegata. Ma perch\u00e9 si utilizza uno dei metalli pi\u00f9 preziosi per un componente tutto sommato di basso costo?<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Le propriet\u00e0 dell&#8217;oro<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">L\u2019oro&nbsp;ha diverse propriet\u00e0 uniche. Essendo pi\u00f9 conduttivo dell\u2019argento, materiale pi\u00f9 usato per i&nbsp;contatti&nbsp;standard, ha meno probabilit\u00e0 di ossidarsi, anzi, non si ossida, nemmeno a&nbsp;contatto&nbsp;con l\u2019acqua. Inoltre non si corrode.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">L\u2019oro, oltre che conduttivo, \u00e8 anche molto malleabile e quindi facilmente lavorabile e riducibile in fogli sottili, di conseguenza, pur trattandosi di un materiale molto costoso, la quantit\u00e0 utilizzata per placcare i&nbsp;contatti&nbsp;\u00e8&nbsp; cos\u00ec minima da rendere economicamente sostenibile e vantaggiosa questa operazione.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">Anche il rame ha importanti propriet\u00e0 conduttive, migliori sia dell\u2019oro&nbsp;che dell\u2019argento, ma \u00e8 fortemente soggetto all\u2019ossidazione e questo lo rende totalmente inadeguato ad essere utilizzato nei&nbsp;contatti&nbsp;elettrici, soprattutto in quelli di un termostato bimetallico, poich\u00e9 l\u2019ossidazione aumenta la resistenza dei&nbsp;contatti&nbsp;elettrici.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">Nella vasta gamma di R&amp;D Components i&nbsp;contatti&nbsp;in&nbsp;oro&nbsp;sono utilizzati sia nei termostati bimetallici che nei protettori termici.<\/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\"><img loading=\"lazy\" decoding=\"async\" width=\"795\" height=\"359\" src=\"https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2022\/07\/TK24-TK32-2.jpg\" alt=\"oro\" class=\"wp-image-13111\" srcset=\"https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2022\/07\/TK24-TK32-2.jpg 795w, https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2022\/07\/TK24-TK32-2-300x135.jpg 300w, https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2022\/07\/TK24-TK32-2-768x347.jpg 768w\" sizes=\"auto, (max-width: 795px) 100vw, 795px\" \/><\/figure>\n<\/div>\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">Tra i bimetallici abbiamo gli onnipresenti\u00a0<a href=\"https:\/\/rdcomponents.com\/site\/termostati-bimetallici\/#tk24\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>TK24<\/strong><\/a>, nella versione con\u00a0contatti\u00a0normalmente aperti e normalmente chiusi. THERMOREX per\u00f2 offre anche una\u00a0 soluzione su richiesta che garantisce una resistenza inferiore ai 5 m\u03a9.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">Esistono poi alcune particolari applicazioni nelle quali il protettore termico \u00e8 utilizzato come sistema di sicurezza, quindi interverr\u00e0 solo in caso di particolari anomalie e per essere sicuri che i&nbsp;contatti&nbsp;non rischino di ossidarsi viene richiesta la placcatura in&nbsp;oro.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">Abbiamo due alternative, il modello\u00a0<strong><a href=\"https:\/\/rdcomponents.com\/site\/altri\/\" target=\"_blank\" rel=\"noreferrer noopener\">JRMA<\/a>\u00a0<\/strong>che lavora a 2A &#8211; AC120V e 2A &#8211; DC24V e il modello\u00a0<strong><a href=\"https:\/\/rdcomponents.com\/site\/altri\/\" target=\"_blank\" rel=\"noreferrer noopener\">JRMD<\/a>\u00a0<\/strong>che lavora a 5A &#8211; AC120V e 5A &#8211; DC24V. Entrambi per 100.000 cicli, un range di intervento che va da -20\u00b0C fino a 200\u00b0C e un reset di 1-3\u00b0C, e disponibili nelle versioni con\u00a0contatti\u00a0sia normalmente aperti che normalmente chiusi.<\/p>\n\n\n\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\"><\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div style=\"height:20px\" 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<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-file\"><a id=\"wp-block-file--media-0a0f6d5d-a741-4f74-8977-487f22a44118\" href=\"https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2022\/07\/43-CONTATTI-IN-ORO.jpg\" target=\"_blank\" rel=\"noreferrer noopener\">43-CONTATTI-IN-ORO<\/a><a href=\"https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2022\/07\/43-CONTATTI-IN-ORO.jpg\" class=\"wp-block-file__button wp-element-button\" download aria-describedby=\"wp-block-file--media-0a0f6d5d-a741-4f74-8977-487f22a44118\">Download<\/a><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Oggi vi sottopongo un caso particolare dove il termostato bimetallico potrebbe avere difficolt\u00e0 ad intervenire, a causa di un passaggio della corrente cos\u00ec bassa da non poter riuscire a vincere la resistenza di isolamento tra i&nbsp;contatti. Ci sono infatti applicazioni in cui la corrente che&#8230;<\/p>\n","protected":false},"author":2,"featured_media":13112,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[236],"tags":[228,116,149],"class_list":["post-13110","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-prodotti","tag-contatti-in-oro","tag-termostati","tag-thermorex"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>#43 - Contatti in oro -<\/title>\n<meta name=\"description\" content=\"Alcuni componenti di sicurezza vengono realizzati con dei contatti in oro, riuscendo cos\u00ec a garantire determinate propriet\u00e0. 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