{"id":13824,"date":"2022-12-15T14:00:00","date_gmt":"2022-12-15T13:00:00","guid":{"rendered":"https:\/\/rdcomponents.com\/site\/?p=13824"},"modified":"2026-06-03T10:52:33","modified_gmt":"2026-06-03T08:52:33","slug":"62-da-spst-a-3pst","status":"publish","type":"post","link":"https:\/\/rdcomponents.com\/site\/2022\/12\/15\/62-da-spst-a-3pst\/","title":{"rendered":"#62 – Da SPST a 3PST"},"content":{"rendered":"\n
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Oggi provo a fare un po\u2019 di chiarezza su alcune sigle che sono utilizzate nell\u2019identificare i contatti elettrici e di conseguenza vengono applicate anche ai termostati e ai protettori termici, dal momento che tutti i tipi di dispositivi bimetallici sono parte di un circuito elettrico, all’interno del quale \u00e8 sempre presente un interruttore che apre e chiude il circuito, e che nel caso del termostato si trova proprio all\u2019interno dei nostri dispositivi<\/strong><\/a>. Nelle schede tecniche pi\u00f9 dettagliate troviamo sigle come\u00a0SPST<\/strong>,\u00a0SPDT<\/strong>,\u00a0DPST<\/strong>,\u00a0DPDT<\/strong>\u00a0e\u00a03PST<\/strong>, per citare le pi\u00f9 comuni.\u00a0<\/p>\n\n\n\n

SP, DP e 3P indicano il polo e ogni polo indica un circuito controllato dal contatto che pu\u00f2 essere unipolare, bipolare o tripolare. Invece ST e DT si riferiscono alla parola inglese Throw<\/em>, e li possiamo condurre al movimento del contatto, che pu\u00f2 essere singolo ON\/OFF oppure OFF\/ON oppure in scambio ON\/0\/OFF, ma questo lo andremo ad approfondire in un\u2019altra occasione. Vediamo nel particolare cosa indicano queste sigle, aiutandoci anche con la tabella sotto riportata.<\/p>\n\n\n\n

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\"spst\"<\/figure>\n<\/div>\n\n\n
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Le sigle e le loro definizioni<\/h2>\n\n\n\n

SPST<\/strong>\u00a0\u2013\u00a0Single Pole Single Throw<\/em>\u00a0\u2013 identifica gli interruttori termici unipolari che controllano un unico circuito elettrico. Il contatto, muovendosi, far\u00e0 un\u2019unica azione di apertura o di chiusura del circuito, a seconda che sia all\u2019inizio su posizioni normalmente aperte o normalmente chiuse. Quindi l\u2019azione sar\u00e0 semplicemente ON\/OFF, o viceversa. Questo \u00e8 il caso pi\u00f9 tipico e vale per i\u00a0protettori termici<\/strong><\/a>, i\u00a0TPS<\/strong><\/a>, i\u00a0Termostati bimetallici<\/strong><\/a>, i\u00a0termostati in aria<\/strong><\/a>, i\u00a0termostati regolabili<\/strong><\/a>, ma soprattutto alcuni tipi di\u00a0termostati a bulbo regolabili unipolari<\/strong><\/a>. Avremo cos\u00ec un terminale in ingresso (input) e uno in uscita (output).\u00a0<\/p>\n\n\n\n

SPDT<\/strong>\u00a0\u2013\u00a0Single Pole Double Throw<\/em>\u00a0\u2013 identifica gli interruttori unipolari che controllano un unico circuito elettrico, ma con il contatto in scambio che muovendosi andr\u00e0 a chiudere o aprire un collegamento (inizialmente in stato di ON oppure OFF) per aprirne un altro (inizialmente in stato di OFF oppure ON). Gli interruttori DT chiudono un circuito sia in posizione Up che in posizione Down (On-On). Un interruttore DT pu\u00f2 anche avere una posizione centrale (spesso On-Off-On). I punti di connessione saranno 3, un input e due output.\u00a0 Un esempio tipico lo possiamo trovare nei\u00a0termostati a bulbo regolabili unipolari con i contatti in scambio<\/strong><\/a>.\u00a0<\/p>\n\n\n\n

DPST<\/strong>\u00a0\u2013\u00a0Double Pole Single Throw<\/em>\u00a0\u2013 identifica gli interruttori bipolari che controllano due circuiti indipendenti e agiscono come due interruttori identici collegati in parallelo. I contatti, muovendosi, faranno un\u2019unica azione di apertura o di chiusura nei singoli circuiti che resteranno sempre indipendenti l\u2019uno dall\u2019altro. Ne sono un esempio gli\u00a0AK33<\/strong><\/a>, oppure i\u00a0termostati a bulbo automatici bipolari<\/strong><\/a>\u00a0oppure a\u00a0riarmo manuale bipolari<\/strong><\/a>. I terminali saranno due in ingresso (input) e due in uscita (output).<\/p>\n\n\n\n

DPDT<\/strong> \u2013 Double Pole Double Throw<\/em> \u2013 \u00e8 semplicemente l’equivalente di due interruttori SPDT che funzionano in parallelo azionati simultaneamente. In genere ci sono sei terminali su un interruttore meccanico DPDT. Due in ingresso, e quattro in uscita di cui due inizialmente normalmente aperti e due normalmente chiusi. <\/p>\n\n\n\n

3PST<\/strong>\u00a0–\u00a0Three Pole Single Throw<\/em>\u00a0\u2013 equivale a tre\u00a0SPST\u00a0in parallelo. I connettori saranno tre in entrata e tre in uscita. Esempi tipici dei prodotti nei quali viene applicato questo schema sono i\u00a0termostati a bulbo a riarmo manuale tripolari<\/strong><\/a>\u00a0e i\u00a0termostati a bulbo a riarmo automatico tripolari<\/strong><\/a>.<\/p>\n\n\n\n

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

62-DA-SPST-A-3PST<\/a>Download<\/a><\/div>\n\n\n\n
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<\/p>\n","protected":false},"excerpt":{"rendered":"

Oggi provo a fare un po\u2019 di chiarezza su alcune sigle che sono utilizzate nell\u2019identificare i contatti elettrici e di conseguenza vengono applicate anche ai termostati e ai protettori termici, dal momento che tutti i tipi di dispositivi bimetallici sono parte di un circuito elettrico,…<\/p>\n","protected":false},"author":2,"featured_media":14477,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[239,236],"tags":[265,123,264,263,262,261,204],"class_list":["post-13824","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-funzionamento-tecnico","category-prodotti","tag-3pst","tag-contatti","tag-dpdt","tag-dpst","tag-spdt","tag-spst","tag-termostati-a-bulbo"],"yoast_head":"\n#62 - Da SPST a 3PST -<\/title>\n<meta name=\"description\" content=\"Una rapida panoramica su alcune sigle utilizzate per definire le tipologie di contatti elettrici, utilizzate anche 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