{"id":13699,"date":"2022-11-10T14:00:00","date_gmt":"2022-11-10T13:00:00","guid":{"rendered":"https:\/\/rdcomponents.com\/site\/?p=13699"},"modified":"2026-06-03T10:52:28","modified_gmt":"2026-06-03T08:52:28","slug":"57-apertura-e-chiusura-dei-contatti-o-on-off","status":"publish","type":"post","link":"https:\/\/rdcomponents.com\/site\/2022\/11\/10\/57-apertura-e-chiusura-dei-contatti-o-on-off\/","title":{"rendered":"#57 – Apertura e chiusura dei contatti o ON\/OFF?"},"content":{"rendered":"\n
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Oggi vorrei mettervi in guardia sul rischio di poter cadere in un\u2019errata interpretazione dei dati d\u2019intervento forniti dalla scheda tecnica di un dispositivo bimetallico. In numerose occasioni abbiamo spiegato il funzionamento di questi dispositivi, basato sul diverso coefficiente di dilatazione dei metalli<\/a> <\/strong>che compongono il disco bimetallico. E’ ormai noto che il processo di deformazione del disco, che provoca l\u2019apertura dei contatti, e il successivo ritorno alla posizione originale, che porta al ripristino<\/strong><\/a>, viene definito ciclo.\u00a0<\/p>\n\n\n\n

Apre e chiude, questo \u00e8 un ciclo. Alcuni produttori nelle schede tecniche usano il termine di OFF e ON. Come per gli interruttori, il primo spegne, quindi si apre il contatto e blocca il passaggio di corrente, il secondo accende, indicando quindi la chiusura del circuito. <\/p>\n\n\n\n

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\"on\/off\"<\/figure>\n<\/div>\n\n\n
<\/div>\n\n\n\n

Quando ci si trova di fronte a questa terminologia bisogna prestare molta attenzione. Spesso si \u00e8 portati a confondersi e considerare ON come l\u2019apertura e OFF come la chiusura dei contatti, ma \u00e8 l\u2019esatto opposto. <\/p>\n\n\n\n

Non dobbiamo scordaci che tutti i tipi di dispositivi bimetallici sono parte di un circuito elettrico, all\u2019interno del quale \u00e8 sempre presente un interruttore che apre e chiude il circuito, e che in questo caso si trova proprio all\u2019interno dei nostri dispositivi.  L\u2019interpretazione pi\u00f9 comune nel mondo della protezione termica \u00e8 quella di definire il circuito sulla base della posizione dei contatti, e quindi \u201cAperto o Chiuso\u201d. In realt\u00e0 non \u00e8 per nulla errato considerare il circuito sulla posizione dell\u2019interruttore, vale a dire \u201cAcceso o Spento\u201d e quindi ON e OFF, dove:<\/p>\n\n\n\n

ON <\/strong>= Acceso = Contatto chiuso<\/em><\/p>\n\n\n\n

OFF <\/strong>= Spento = Contatto aperto<\/em><\/p>\n\n\n\n

Facendo un esempio pratico, un termostato bimetallico che interviene aprendo i contatti a 100\u00b0C e si ripristina a 85\u00b0C potr\u00e0 essere descritto nei seguenti modi:<\/p>\n\n\n\n

Apre a 100\u00b0C e Chiude a 85\u00b0C<\/p>\n\n\n\n

ma anche<\/p>\n\n\n\n

OFF <\/strong>100\u00b0C e ON <\/strong>85\u00b0C<\/p>\n\n\n\n

In quest\u2019ultimo caso potremmo avere un\u2019ulteriore possibilit\u00e0 di confusione se prendessimo in esame la scheda tecnica di un termostato bimetallico con i contatti normalmente aperti, anche se la terminologia ON\/OFF<\/strong> in realt\u00e0 \u00e8 chiarissima:<\/p>\n\n\n\n

OFF <\/strong>80\u00b0C e ON <\/strong>100\u00b0C<\/p>\n\n\n\n

Siamo tutti d\u2019accordo?<\/p>\n\n\n\n

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\"on\/off\"<\/figure>\n<\/div>\n\n\n
<\/div>\n\n\n\n

ON\/OFF: le terminologie utilizzate<\/h2>\n\n\n\n
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Forse sar\u00e0 soggettivo, ma la lingua italiana e la terminologia \u201cAperto\/Chiuso\u201d lasciano, a mio avviso, meno margini di interpretazione, e quindi meno possibilit\u00e0 di errore.<\/p>\n\n\n\n

Come si accennava prima, la terminologia fin qui descritta \u00e8 quella che incontriamo sulle schede tecniche di un prodotto specifico, l\u00e0 dove i dati riportati fanno riferimento a una esatta esecuzione, pertanto diventa necessario riportare la temperatura d\u2019intervento con la relativa tolleranza, il ripristino e tutte le relative caratteristiche tecniche o costruttive.   <\/p>\n\n\n\n

Invece nei cataloghi o nelle schede generiche di presentazione del prodotto, va per la maggiore la terminologia di Switching temperature o, come abbiamo visto in “Differenziale e ripristino<\/strong><\/a>\u201d, Normal Switching temperature<\/em> (NST<\/strong>), i produttori del Far-East invece usano spesso il termine \u201cAction Temperature\u201d ma in tutti questi casi si fa riferimento al range di temperatura che il prodotto \u00e8 in grado di offrire. <\/p>\n\n\n\n

Concludendo le diverse terminologie, R&D Components, nelle sue schede tecniche ha adottato la dicitura convenzionale di \u201cTemperature nominali<\/em>\u201d per i protettori termici<\/strong><\/a> e i termostati in aria<\/strong><\/a>, e di \u201cTemperature di lavoro<\/em>\u201d per i Termostati bimetallici<\/strong><\/a>.<\/p>\n\n\n\n

<\/div>\n\n\n\n

Scarica l’articolo in versione stampabile cliccando qui sotto!<\/p>\n\n\n\n

57-APERTURA-E-CHIUSURA-CONTATTI-O-ON-OFF<\/a>Download<\/a><\/div>\n\n\n\n
<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

Oggi vorrei mettervi in guardia sul rischio di poter cadere in un\u2019errata interpretazione dei dati d\u2019intervento forniti dalla scheda tecnica di un dispositivo bimetallico. In numerose occasioni abbiamo spiegato il funzionamento di questi dispositivi, basato sul diverso coefficiente di dilatazione dei metalli che compongono il…<\/p>\n","protected":false},"author":2,"featured_media":14192,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[239,236],"tags":[123,254],"class_list":["post-13699","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-funzionamento-tecnico","category-prodotti","tag-contatti","tag-on-off"],"yoast_head":"\n#57 - Apertura e chiusura dei contatti o ON\/OFF? -<\/title>\n<meta name=\"description\" content=\"Con l'articolo di oggi proviamo a chiarire una volta in pi\u00f9 la questione ON\/OFF o Aperto\/Chiuso nei contatti dei dispositivi bimetallici\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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