{"id":1108,"date":"2026-08-07T01:00:00","date_gmt":"2026-08-06T17:00:00","guid":{"rendered":"https:\/\/lemaele.com\/blog\/spdt-toggle-switch-wiring-oem-guide\/"},"modified":"2026-08-07T01:00:00","modified_gmt":"2026-08-06T17:00:00","slug":"spdt-toggle-switch-wiring-oem-guide","status":"publish","type":"post","link":"https:\/\/lemaele.com\/fr\/blog\/spdt-toggle-switch-wiring-oem-guide\/","title":{"rendered":"Identifying SPDT Toggle Switch Terminals for OEM Wiring"},"content":{"rendered":"<div class=\"b2b-article\">\n<p style=\"margin:0 0 16px;line-height:1.7\"><strong>SPDT wiring fails when teams guess terminals from a lever photo.<\/strong> Lock the common and each throw on the schematic first, then assign harness pins. A clean panel still misbehaves when C and throw labels drift between drawing revisions.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\"><strong>Important :<\/strong> Treat SPDT terminal identity as a drawing-controlled field, not a shop-floor nickname. Confirm contact paths against selected-model documentation before harness release. Source note: IEC 61058-1 publication scope and selected-model documentation.<\/p>\n<p>\u2013 FAQ<\/p>\n<figure style=\"margin:26px 0;text-align:center\" class=\"wp-block-image size-large b2b-article-figure\"><img style=\"max-width:640px;width:100%;height:auto;display:block;margin:0 auto;border-radius:8px\" src=\"https:\/\/lemaele.com\/wp-content\/uploads\/2026\/05\/LT1-series-toggle-switch.2.webp\" alt=\"LEMA LT1 series toggle switch product photo for SPDT terminal identification planning\" loading=\"lazy\" decoding=\"async\" title=\"\"><\/figure>\n<nav class=\"b2b-toc\" style=\"background:#f5f8fa;padding:16px 20px;border-radius:8px;margin:0 0 24px\">\n<h2 id=\"contents\" style=\"margin:42px 0 14px;scroll-margin-top:96px\">Sommaire<\/h2>\n<ul style=\"margin:0 0 18px 1.2em;line-height:1.7\">\n<li style=\"margin:0 0 8px\"><a style=\"color:#f27c00;text-decoration:underline\" href=\"#part-1-which-terminals-define-an-spdt-toggle-on-the-drawing\">Part 1. Which terminals define an SPDT toggle on the drawing?<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a style=\"color:#f27c00;text-decoration:underline\" href=\"#part-2-how-should-common-and-throw-pins-be-labeled-in-the-harness\">Part 2. How should common and throw pins be labeled in the harness?<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a style=\"color:#f27c00;text-decoration:underline\" href=\"#part-3-when-does-spdt-wiring-differ-from-simple-on-off-slang\">Part 3. When does SPDT wiring differ from simple ON-OFF slang?<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a style=\"color:#f27c00;text-decoration:underline\" href=\"#part-4-which-load-and-panel-notes-still-belong-beside-the-pin-map\">Part 4. Which load and panel notes still belong beside the pin map?<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a style=\"color:#f27c00;text-decoration:underline\" href=\"#part-5-how-do-oems-prevent-terminal-swaps-during-service\">Part 5. How do OEMs prevent terminal swaps during service?<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a style=\"color:#f27c00;text-decoration:underline\" href=\"#part-6-how-should-spdt-wiring-be-validated-before-release\">Part 6. How should SPDT wiring be validated before release?<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a style=\"color:#f27c00;text-decoration:underline\" href=\"#part-7-how-can-lema-support-an-spdt-wiring-inquiry\">Part 7. How can LEMA support an SPDT wiring inquiry?<\/a><\/li>\n<\/ul>\n<\/nav>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-1-which-terminals-define-an-spdt-toggle-on-the-drawing\">Part 1. Which terminals define an SPDT toggle on the drawing?<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">Start from the contact diagram: one common (C \/ COM) and two throws that the lever selects. Record which throw is ON in each maintained position and whether a center-off exists.<\/p>\n<table style=\"width:100%;border-collapse:collapse\">\n<thead>\n<tr>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Crit\u00e8re de d\u00e9cision<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Donn\u00e9es \u00e0 documenter<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">\u00c0 joindre \u00e0 la demande de devis<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Terminal map<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">C \/ throw labels on the drawing<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Oui \u2014 sch\u00e9ma clairement identifi\u00e9<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Configuration du circuit<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Maintained states the SPDT must express<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Oui \u2014 format imprim\u00e9<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Chemin de charge<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Which throw carries which load<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Oui \u2014 r\u00e9sum\u00e9 du cycle de fonctionnement<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Montage sur panneau<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">D\u00e9coupe, \u00e9paisseur, d\u00e9gagement<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Oui \u2014 encombrement de montage<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"margin:0 0 16px;line-height:1.7\">Consultez le <a style=\"color:#f27c00;text-decoration:underline\" href=\"https:\/\/lemaele.com\/fr\/toggle-switch\/\">gamme de commutateurs \u00e0 bascule LEMA<\/a> only after the pin map exists.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-2-how-should-common-and-throw-pins-be-labeled-in-the-harness\">Part 2. How should common and throw pins be labeled in the harness?<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">Harness labels should mirror the drawing characters exactly. If manufacturing uses color codes, keep a cross-reference table in the same package so service teams do not invent new names.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">When the panel language still says ON-OFF without poles and throws, compare against the <a style=\"color:#f27c00;text-decoration:underline\" href=\"https:\/\/lemaele.com\/fr\/blog\/on-off-vs-on-off-on-toggle-switch-guide\/\">Logique ON-OFF ou ON-OFF-ON<\/a> guide before freezing SPDT hardware.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-3-when-does-spdt-wiring-differ-from-simple-on-off-slang\">Part 3. When does SPDT wiring differ from simple ON-OFF slang?<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">Shop slang often collapses SPDT into \u201ca three-screw toggle.\u201d That shortcut hides which throw is live in each lever position and invites DPDT substitutions later.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">Dual-circuit panels that truly need two poles should move to the <a style=\"color:#f27c00;text-decoration:underline\" href=\"https:\/\/lemaele.com\/fr\/blog\/dpdt-toggle-switch-oem-selection-guide\/\">sch\u00e9ma de s\u00e9lection DPDT \u00e0 double circuit<\/a> checklist instead of forcing one SPDT to carry both paths.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-4-which-load-and-panel-notes-still-belong-beside-the-pin-map\">Part 4. Which load and panel notes still belong beside the pin map?<\/h2>\n<figure style=\"margin:26px 0;text-align:center\" class=\"wp-block-image size-large b2b-article-figure\"><img style=\"max-width:640px;width:100%;height:auto;display:block;margin:0 auto;border-radius:8px\" src=\"https:\/\/lemaele.com\/wp-content\/uploads\/2026\/05\/Toggle-Switch-Solder-Terminal.3.webp\" alt=\"LEMA toggle switch solder terminal detail for SPDT OEM wiring review\" loading=\"lazy\" decoding=\"async\" title=\"\"><\/figure>\n<p style=\"margin:0 0 16px;line-height:1.7\">Pin identity does not replace electrical and mechanical review. Capture voltage class, steady current, inrush, terminal style, cutout, and rear clearance next to the SPDT map.<\/p>\n<ul style=\"margin:0 0 18px 1.2em;line-height:1.7\">\n<li style=\"margin:0 0 8px\">Match solder versus screw terminals to the harness process.<\/li>\n<li style=\"margin:0 0 8px\">Keep inrush notes tied to the energized throw.<\/li>\n<li style=\"margin:0 0 8px\">Reject unmarked samples that lack a matching terminal drawing.<\/li>\n<li style=\"margin:0 0 8px\">Low-voltage accessory context remains useful via the <a style=\"color:#f27c00;text-decoration:underline\" href=\"https:\/\/lemaele.com\/fr\/blog\/12v-toggle-switch-oem-panel-guide\/\">Planification des commutateurs \u00e0 bascule pour panneaux OEM 12 V<\/a> .<\/li>\n<\/ul>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-5-how-do-oems-prevent-terminal-swaps-during-service\">Part 5. How do OEMs prevent terminal swaps during service?<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">Service swaps create silent failures when BOM text only says \u201cSPDT toggle.\u201d Print terminal IDs on the schematic, nameplate callout, and spare-part label so purchasing cannot substitute by appearance.<\/p>\n<table style=\"width:100%;border-collapse:collapse\">\n<thead>\n<tr>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Contr\u00f4le<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Strong practice<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Weak practice<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">BOM text<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">SPDT with drawing revision<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Generic toggle SKU<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Faisceau de c\u00e2bles<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Pins mapped to C \/ throws<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Color-only notes<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Spares<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Same terminal drawing<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Any three-terminal lookalike<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-6-how-should-spdt-wiring-be-validated-before-release\">Part 6. How should SPDT wiring be validated before release?<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">Validate continuity on each throw, confirm the common lands where the harness expects, and cycle the lever against the operator script on a production-intent panel.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\"><strong>Limites d'utilisation :<\/strong> this guide covers drawing and harness identification only. Verify model-specific ratings, approvals, environmental sealing, and endurance against the applicable documentation before releasing hardware.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-7-how-can-lema-support-an-spdt-wiring-inquiry\">Part 7. How can LEMA support an SPDT wiring inquiry?<\/h2>\n<figure style=\"margin:26px 0;text-align:center\" class=\"wp-block-image size-large b2b-article-figure\"><img style=\"max-width:640px;width:100%;height:auto;display:block;margin:0 auto;border-radius:8px\" src=\"https:\/\/lemaele.com\/wp-content\/uploads\/2026\/05\/Toggle-Switch-Screw-Terminal.2.webp\" alt=\"LEMA toggle switch screw terminal product view for an SPDT harness inquiry\" loading=\"lazy\" decoding=\"async\" title=\"\"><\/figure>\n<p style=\"margin:0 0 16px;line-height:1.7\">Utilisez le <a style=\"color:#f27c00;text-decoration:underline\" href=\"https:\/\/lemaele.com\/fr\/lt1-series-toggle-switch\/\">Interrupteur \u00e0 bascule s\u00e9rie LT1<\/a> page as a public starting point once the terminal map and mounting envelope are documented.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\"><strong>\u00c0 joindre \u00e0 la demande :<\/strong><\/p>\n<ul style=\"margin:0 0 18px 1.2em;line-height:1.7\">\n<li style=\"margin:0 0 8px\">SPDT terminal map with C \/ throw labels<\/li>\n<li style=\"margin:0 0 8px\">Tension, courant permanent, type de charge et courant d'appel<\/li>\n<li style=\"margin:0 0 8px\">D\u00e9coupe, \u00e9paisseur du panneau et d\u00e9gagement arri\u00e8re<\/li>\n<li style=\"margin:0 0 8px\">Type de borne, volume et calendrier d'\u00e9chantillonnage<\/li>\n<\/ul>\n<p style=\"margin:0 0 16px;line-height:1.7\"><strong>Recommandation de produit :<\/strong> request a documented LEMA review against the wiring drawing. Do not approve a part from an unlabeled photo.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\"><a style=\"color:#f27c00;text-decoration:underline\" href=\"https:\/\/lemaele.com\/fr\/contact-us\/\">Envoyer une demande de devis pour un interrupteur \u00e0 bascule<\/a> with the terminal map, duty, volume, and sample timing.<\/p>\n<p>FAQ ##<\/p>\n<h3 style=\"margin:28px 0 12px\">What does SPDT mean on a toggle switch?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">SPDT means single-pole double-throw: one common terminal selects between two throw paths according to lever position.<\/p>\n<h3 style=\"margin:28px 0 12px\">How do I identify the common terminal?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Use the selected-model terminal drawing; do not assume center screw or a color mark without documentation.<\/p>\n<h3 style=\"margin:28px 0 12px\">Is every three-terminal toggle an SPDT?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">No. Confirm poles, throws, and maintained states on the printed circuit form before wiring.<\/p>\n<h3 style=\"margin:28px 0 12px\">Can purchasing swap SPDT parts by appearance?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">No. Lever look is not proof of terminal identity; the labeled drawing is the authority.<\/p>\n<h3 style=\"margin:28px 0 12px\">When should I choose DPDT instead of SPDT?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Choose DPDT when two independent poles must switch together; see the dual-circuit selection checklist rather than paralleling guesses on one SPDT.<\/p>\n<h3 style=\"margin:28px 0 12px\">What should an SPDT wiring RFQ include?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Include the terminal map, circuit form, load and inrush, cutout, terminal style, volume, and sample timing.<\/p>\n<p>R\u00e9f\u00e9rences ##<\/p>\n<ul style=\"margin:0 0 18px 1.2em;line-height:1.7\">\n<li style=\"margin:0 0 8px\"><a style=\"color:#f27c00;text-decoration:underline\" href=\"https:\/\/webstore.iec.ch\/en\/publication\/66912\" target=\"_blank\" rel=\"noopener\">IEC 61058-1 publication page for appliance-switch scope used when framing SPDT contact duties<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a style=\"color:#f27c00;text-decoration:underline\" href=\"https:\/\/www.nkkswitches.com\/pdf\/Mtoggle_Waterproof.pdf\" target=\"_blank\" rel=\"noopener\">NKK M-series waterproof toggle PDF showing industry terminal and circuit-form fields for wiring reviews<\/a><\/li>\n<\/ul>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>SPDT wiring fails when teams guess terminals from a lever photo. Lock the common and each throw on the schematic first, then assign harness pins. A clean panel still misbehaves when C and throw labels drift between drawing revisions. Important: Treat SPDT terminal identity as a drawing-controlled field, not a shop-floor nickname. Confirm contact paths [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":315,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1108","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"_links":{"self":[{"href":"https:\/\/lemaele.com\/fr\/wp-json\/wp\/v2\/posts\/1108","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lemaele.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lemaele.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lemaele.com\/fr\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/lemaele.com\/fr\/wp-json\/wp\/v2\/comments?post=1108"}],"version-history":[{"count":0,"href":"https:\/\/lemaele.com\/fr\/wp-json\/wp\/v2\/posts\/1108\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lemaele.com\/fr\/wp-json\/wp\/v2\/media\/315"}],"wp:attachment":[{"href":"https:\/\/lemaele.com\/fr\/wp-json\/wp\/v2\/media?parent=1108"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lemaele.com\/fr\/wp-json\/wp\/v2\/categories?post=1108"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lemaele.com\/fr\/wp-json\/wp\/v2\/tags?post=1108"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}