{"id":17832,"date":"2025-11-20T14:00:00","date_gmt":"2025-11-20T13:00:00","guid":{"rendered":"https:\/\/rdcomponents.com\/site\/?p=17832"},"modified":"2026-06-03T10:59:47","modified_gmt":"2026-06-03T08:59:47","slug":"196-termostati-di-sicurezza-con-contatti-in-scambio","status":"publish","type":"post","link":"https:\/\/rdcomponents.com\/site\/2025\/11\/20\/196-termostati-di-sicurezza-con-contatti-in-scambio\/","title":{"rendered":"#196\u00a0Termostati di sicurezza con contatti in scambio"},"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\"><\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><\/div>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">Se nel progetto di una macchina viene inserito un&nbsp;<strong>termostato di sicurezza<\/strong>, a&nbsp;<strong>contatto&nbsp;<\/strong>come i&nbsp;<strong><a href=\"https:\/\/rdcomponents.com\/site\/termostati-bimetallici\/#tk32\" target=\"_blank\" rel=\"noreferrer noopener\">TK32<\/a>&nbsp;<\/strong>o a&nbsp;<strong><a href=\"https:\/\/rdcomponents.com\/site\/termostati-bulbo-caldo\/\" target=\"_blank\" rel=\"noreferrer noopener\">bulbo<\/a>&nbsp;<\/strong>fa poca differenza, \u00e8 perch\u00e9 si prevede che la temperatura possa andare oltre i limiti di sicurezza e debba cos\u00ec intervenire un limitatore a salvaguardare l\u2019apparecchio. Ma come faccio a sapere che \u00e8 intervenuta una sicurezza? Ci si pu\u00f2 accontentare di una macchina che si ferma?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">Chiaramente la priorit\u00e0 \u00e8 salvare la&nbsp;<strong>macchina<\/strong> ed evitare che venga danneggiata da un\u2019anomalia. O, peggio, che si instauri un&nbsp;<strong>principio di incendio<\/strong>, con tutte le conseguenze che ne possono derivare. Ma a volte pu\u00f2 essere utile venire informati del fatto che la nostra macchina non sta lavorando per cause da definire. E far partire un allarme potrebbe essere una soluzione che ci consente di intervenire in tempi brevi, ma come possiamo fare?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">Esistono alcune soluzioni meccaniche che soddisfano le nostre esigenze.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">La prima, che poi \u00e8 la pi\u00f9 comune, \u00e8 quella di usare un&nbsp;<a href=\"https:\/\/rdcomponents.com\/site\/termostati-bimetallici\/#tk24\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>termostato bimetallico con i contatti normalmente aperti<\/strong><\/a>. Ci\u00f2 significa che in condizioni normali e a temperatura ambiente, i contatti sono aperti e non passa la corrente. Dopodich\u00e9, raggiunta la temperatura su cui \u00e8 tarato, i contatti andranno a chiudersi e di conseguenza ci sar\u00e0 un&nbsp;<strong>passaggio di corrente<\/strong>&nbsp;che nel nostro caso potrebbe far partire un&nbsp;<strong>allarme acustico<\/strong>&nbsp;o&nbsp;<strong>visivo<\/strong>, ad esempio una&nbsp;<strong>luce d\u2019emergenza<\/strong>&nbsp;oppure una&nbsp;<strong>ventola<\/strong>. Ma questa \u00e8 una soluzione in aggiunta alla sicurezza, che \u00e8 quella che, al contrario, apre i contatti fermando il funzionamento della macchina. Questo compito pu\u00f2 essere eseguito da un normale&nbsp;<strong>termostato bimetallico con contatti normalmente chiusi<\/strong>. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">Questa soluzione prevede quindi l\u2019uso di due termostati a contatto, che <a href=\"https:\/\/rdcomponents.com\/site\/2021\/10\/21\/8-l-importanza-della-posizione\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>devono essere posizionati nel punto in cui si deve rilevare la temperatura<\/strong><\/a>. Questo per\u00f2 non \u00e8 sempre possibile. Perch\u00e9 per certe applicazioni \u00e8 indispensabile poter intervenire da un punto distante da quello nel quale dobbiamo rilevare la temperatura.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">A questo proposito, abbiamo visto che \u00e8 possibile concentrare in un unico dispositivo una protezione e un intervento. <a href=\"https:\/\/rdcomponents.com\/site\/2025\/01\/23\/158-contatti-in-scambio\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Questo avviene con i cosiddetti contatti in scambio<\/strong><\/a>, vale a dire un dispositivo con contatti normalmente chiusi dove, nel momento in cui il dispositivo interviene, i contatti vanno a chiudere un secondo circuito, collegato al primo <a href=\"https:\/\/rdcomponents.com\/site\/2022\/12\/15\/62-da-spst-a-3pst\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>ma inizialmente su posizioni aperte, schematizzato in\u00a0SPDT<\/strong><\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">Questa \u00e8 normalmente una peculiarit\u00e0 dei termostati a bulbo. Ma nella vasta gamma di\u00a0<strong>R&amp;D Components<\/strong>\u00a0esistono anche dei\u00a0<a href=\"https:\/\/rdcomponents.com\/site\/protettori-contatti-scambio\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>protettori termici con contatti in scambio<\/strong><\/a>\u00a0(<a href=\"https:\/\/rdcomponents.com\/site\/2023\/02\/02\/67-protettori-termici-con-contatti-in-scambio\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Articolo 67<\/strong><\/a> e <a href=\"https:\/\/rdcomponents.com\/site\/2023\/02\/09\/68-protettori-termici-con-contatti-in-scambio-e-riarmo-elettrico\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>68<\/strong><\/a>).<\/p>\n\n\n\n<div style=\"height:30px\" 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 decoding=\"async\" src=\"https:\/\/rdcomponents.com\/site\/wp-content\/uploads\/2025\/12\/SP-121-BF-scaled.jpg\" alt=\"contatti in scambio\" class=\"wp-image-17841\" style=\"width:850px\"\/><\/figure>\n<\/div>\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">Esiste per\u00f2 anche una versione di\u00a0<a href=\"https:\/\/rdcomponents.com\/site\/tecasa\/#sp\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>termostato a bulbo di sicurezza<\/strong><\/a>, con riarmo manuale, e con i contatti in scambio, come il modello della serie SP dei nostri partner spagnoli di\u00a0<strong>TECASA<\/strong>. Agisce come un normale\u00a0<strong>termostato a bulbo di sicurezza<\/strong>. Quindi, se si raggiunge la temperatura su cui \u00e8 tarato interviene e apre i contatti e, interrompendo l\u2019alimentazione, evita che la macchina continui a surriscaldarsi. Per ripristinare il termostato sar\u00e0 necessario premere il\u00a0<strong>pulsante di riarmo<\/strong>, e quindi servir\u00e0 un\u00a0<strong>intervento attivo e volontario<\/strong>\u00a0(possibilmente consapevole) di un addetto ai lavori. Mentre i contatti erano aperti e la macchina non funzionava per\u00f2 \u00e8 avvenuto lo\u00a0<strong>scambio<\/strong>. E quello che prima era un circuito dormiente, non alimentato, \u00e8 diventato funzionante. In questo modo diventa possibile far partire una ventola, un allarme o qualsiasi tipo di segnale per informare che la macchina si \u00e8 fermata.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:16px\">Quindi si tratta di una protezione per la sicurezza e di un intervento che avvisa che la macchina \u00e8 ferma, tutto in un unico, piccolo e compatto dispositivo.<\/p>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Se nel progetto di una macchina viene inserito un&nbsp;termostato di sicurezza, a&nbsp;contatto&nbsp;come i&nbsp;TK32&nbsp;o a&nbsp;bulbo&nbsp;fa poca differenza, \u00e8 perch\u00e9 si prevede che la temperatura possa andare oltre i limiti di sicurezza e debba cos\u00ec intervenire un limitatore a salvaguardare l\u2019apparecchio. Ma come faccio a sapere che&#8230;<\/p>\n","protected":false},"author":2,"featured_media":17841,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[239,236],"tags":[140,141,286,139],"class_list":["post-17832","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-funzionamento-tecnico","category-prodotti","tag-sung-woo","tag-sw1","tag-sw3","tag-termofusibili"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>#196\u00a0Termostati di sicurezza con contatti in scambio -<\/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\/2025\/11\/20\/196-termostati-di-sicurezza-con-contatti-in-scambio\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"#196\u00a0Termostati di sicurezza con contatti in scambio -\" \/>\n<meta property=\"og:description\" content=\"Se nel progetto di una macchina viene inserito un&nbsp;termostato di sicurezza, a&nbsp;contatto&nbsp;come i&nbsp;TK32&nbsp;o a&nbsp;bulbo&nbsp;fa poca differenza, \u00e8 perch\u00e9 si prevede che la temperatura possa andare oltre i limiti di sicurezza e debba cos\u00ec intervenire un limitatore a salvaguardare l\u2019apparecchio. 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