{"id":2256,"date":"2026-08-06T01:39:26","date_gmt":"2026-08-06T01:39:26","guid":{"rendered":"https:\/\/onpowbutton.com\/news\/\/"},"modified":"2026-08-06T01:39:26","modified_gmt":"2026-08-06T01:39:26","slug":"normally-open-switch-vs-normally-closed-switch","status":"publish","type":"post","link":"https:\/\/onpowbutton.com\/fr\/news\/normally-open-switch-vs-normally-closed-switch\/","title":{"rendered":"Lequel est le plus s\u00fbr, NO ou NC ?"},"content":{"rendered":"<p>Lors du choix d'un bouton-poussoir, d'un interrupteur de fin de course, d'un capteur ou d'un dispositif de commande de s\u00e9curit\u00e9, de nombreux acheteurs posent la m\u00eame question :<\/p>\n<p><strong>Lequel est le plus s\u00fbr, un interrupteur normalement ouvert ou un interrupteur normalement ferm\u00e9 ?<\/strong><\/p>\n<p>La r\u00e9ponse courte est :<\/p>\n<p>Un interrupteur normalement ferm\u00e9 (NC) est g\u00e9n\u00e9ralement plus s\u00fbr pour les circuits critiques en mati\u00e8re de s\u00e9curit\u00e9 car il peut assurer une surveillance \u00e0 s\u00e9curit\u00e9 int\u00e9gr\u00e9e. Cependant, le choix le plus s\u00fbr d\u00e9pend toujours de la fonction du circuit et de l'application.<\/p>\n<p>Pour prendre la bonne d\u00e9cision, vous devez d'abord comprendre comment <a href=\"https:\/\/onpowbutton.com\/fr\/products\/\">interrupteurs normalement ouverts et interrupteurs normalement ferm\u00e9s<\/a> travail.<\/p>\n<p><!-- \u56fe\u72471 --><img decoding=\"async\" src=\"https:\/\/onpowbutton.com\/wp-content\/uploads\/2026\/07\/outdoor-equipment-control-panel-waterproof-push-button.webp\" alt=\"Industrial waterproof push button control panel\" \/><\/p>\n<hr \/>\n<h2>Qu'est-ce qu'un interrupteur normalement ouvert ?<\/h2>\n<p>A <a href=\"https:\/\/onpowbutton.com\/fr\/metal-push-button-switch\/\">contact normalement ouvert<\/a> (Un interrupteur NO) a un circuit ouvert lorsqu'il est dans son \u00e9tat normal et non activ\u00e9.<\/p>\n<p>Comme le circuit est ouvert, le courant \u00e9lectrique ne peut pas circuler. Lorsque l'interrupteur est press\u00e9, activ\u00e9 ou d\u00e9clench\u00e9, les contacts se ferment et permettent au courant de passer.<\/p>\n<p><strong>En termes simples :<\/strong><\/p>\n<ul>\n<li><strong>\u00c9tat normal<\/strong> Circuit ouvert<\/li>\n<li><strong>Interrupteur activ\u00e9 :<\/strong> Circuit ferm\u00e9<\/li>\n<li><strong>Flux actuel :<\/strong> Uniquement lorsqu&#x27;elle est activ\u00e9e<\/li>\n<\/ul>\n<p>Un interrupteur normalement ouvert est couramment utilis\u00e9 lorsqu'une action doit commencer apr\u00e8s que l'interrupteur a \u00e9t\u00e9 actionn\u00e9.<\/p>\n<p>Les applications typiques incluent :<\/p>\n<ul>\n<li>Boutons de d\u00e9marrage<\/li>\n<li>Commandes de mise en service de la machine<\/li>\n<li>Sonnettes<\/li>\n<li>D\u00e9clencheurs de signaux<\/li>\n<li>Boutons du panneau de commande<\/li>\n<li>Boutons-poussoirs momentan\u00e9s<\/li>\n<\/ul>\n<p>Par exemple, lorsqu&#x27;un op\u00e9rateur appuie sur le bouton de d\u00e9marrage d&#x27;une machine, les contacts NO se ferment et envoient un signal pour d\u00e9marrer la machine.<\/p>\n<hr \/>\n<h2>Qu'est-ce qu'un interrupteur normalement ferm\u00e9 ?<\/h2>\n<p>A <a href=\"https:\/\/onpowbutton.com\/fr\/emergency-stop-button\/\">interrupteur normalement ferm\u00e9<\/a> (Interrupteur NF) a un circuit ferm\u00e9 lorsqu'il est dans son \u00e9tat normal et non activ\u00e9.<\/p>\n<p>Le circuit \u00e9tant ferm\u00e9, le courant \u00e9lectrique peut circuler en continu. Lorsque l'interrupteur est press\u00e9, activ\u00e9 ou d\u00e9clench\u00e9, les contacts s'ouvrent et interrompent le circuit.<\/p>\n<p><strong>En termes simples :<\/strong><\/p>\n<ul>\n<li><strong>\u00c9tat normal<\/strong> Circuit ferm\u00e9<\/li>\n<li><strong>Interrupteur activ\u00e9 :<\/strong> Circuit ouvert<\/li>\n<li><strong>Flux actuel :<\/strong> Jusqu'\u00e0 ce que l'interrupteur soit actionn\u00e9<\/li>\n<\/ul>\n<p>Un interrupteur normalement ferm\u00e9 est souvent utilis\u00e9 lorsqu'un syst\u00e8me doit v\u00e9rifier si le circuit \u00e9lectrique reste ferm\u00e9.<\/p>\n<p>Les applications typiques incluent :<\/p>\n<ul>\n<li>Circuits d'arr\u00eat d'urgence<\/li>\n<li>Syst\u00e8mes de verrouillage de s\u00e9curit\u00e9<\/li>\n<li>Commandes de s\u00e9curit\u00e9 des machines<\/li>\n<li>Protections<\/li>\n<li>Syst\u00e8mes d'alarme<\/li>\n<li>Circuits de surveillance des d\u00e9fauts<\/li>\n<\/ul>\n<p>Par exemple, un bouton d'arr\u00eat d'urgence peut utiliser des contacts NF. Dans des conditions normales de fonctionnement, le circuit de s\u00e9curit\u00e9 reste ferm\u00e9. Lorsque le bouton d'arr\u00eat d'urgence est actionn\u00e9, les contacts s'ouvrent et interrompent le circuit.<\/p>\n<hr \/>\n<h2>Lequel est le plus s\u00fbr : NO ou NC ?<\/h2>\n<p>Pour la plupart des applications li\u00e9es \u00e0 la s\u00e9curit\u00e9, un interrupteur NF est g\u00e9n\u00e9ralement consid\u00e9r\u00e9 comme plus s\u00fbr.<\/p>\n<p>La raison principale est qu'un circuit NF peut aider \u00e0 d\u00e9tecter certains d\u00e9fauts qui pourraient autrement rester cach\u00e9s.<\/p>\n<p>Imaginons, par exemple, qu&#x27;un fil se d\u00e9connecte dans un circuit de s\u00e9curit\u00e9 :<\/p>\n<ul>\n<li>Dans un circuit NC, le fil coup\u00e9 ouvre le circuit et peut d\u00e9clencher une r\u00e9ponse d'arr\u00eat ou de d\u00e9faut.<\/li>\n<li>Dans un circuit NO, le circuit est d\u00e9j\u00e0 ouvert en fonctionnement normal, de sorte qu'un fil coup\u00e9 peut ne pas \u00eatre d\u00e9tect\u00e9 imm\u00e9diatement.<\/li>\n<\/ul>\n<p>C'est pourquoi les contacts NF sont couramment utilis\u00e9s dans les circuits d'arr\u00eat d'urgence et autres syst\u00e8mes de contr\u00f4le li\u00e9s \u00e0 la s\u00e9curit\u00e9.<\/p>\n<p>Cela ne signifie toutefois pas que tous les interrupteurs NC soient automatiquement s\u00fbrs, ni que les interrupteurs NO soient dangereux.<\/p>\n<p>La s\u00e9curit\u00e9 d'un syst\u00e8me d\u00e9pend de plusieurs facteurs, notamment :<\/p>\n<ul>\n<li>La fonction du circuit<\/li>\n<li>La conception du syst\u00e8me de contr\u00f4le<\/li>\n<li>Le niveau de s\u00e9curit\u00e9 requis<\/li>\n<li>La m\u00e9thode de c\u00e2blage<\/li>\n<li>Le type de commutateur<\/li>\n<li>L'environnement op\u00e9rationnel<\/li>\n<li>Les normes de s\u00e9curit\u00e9 applicables<\/li>\n<\/ul>\n<p>Le type de contact n'est qu'un \u00e9l\u00e9ment de la conception globale de la s\u00e9curit\u00e9.<\/p>\n<hr \/>\n<h2>Pourquoi utilise-t-on souvent des contacts NC dans les circuits d&#x27;arr\u00eat d&#x27;urgence ?<\/h2>\n<p>Les syst\u00e8mes d'arr\u00eat d'urgence sont con\u00e7us pour arr\u00eater une machine ou r\u00e9duire un mouvement dangereux en cas d'urgence.<\/p>\n<p>Un contact NF est utile car le circuit de s\u00e9curit\u00e9 reste ferm\u00e9 en fonctionnement normal. Si le bouton d'arr\u00eat d'urgence est press\u00e9, le contact s'ouvre et interrompt le circuit.<\/p>\n<p>Une conception NC peut \u00e9galement r\u00e9agir \u00e0 certains probl\u00e8mes de c\u00e2blage.<\/p>\n<p>Par exemple, si un fil se desserre ou se rompt :<\/p>\n<ol>\n<li>Le circuit s'ouvre.<\/li>\n<li>Le syst\u00e8me de contr\u00f4le d\u00e9tecte l'interruption.<\/li>\n<li>La machine peut s&#x27;arr\u00eater ou passer en mode de s\u00e9curit\u00e9.<\/li>\n<\/ol>\n<p>Ce principe est souvent appel\u00e9 fonctionnement par isod\u00e9faut.<\/p>\n<p>Une conception \u00e0 s\u00e9curit\u00e9 int\u00e9gr\u00e9e vise \u00e0 amener le syst\u00e8me vers un \u00e9tat plus s\u00fbr lorsqu'une panne se produit, plut\u00f4t que de permettre \u00e0 la machine de continuer \u00e0 fonctionner sans d\u00e9tecter le probl\u00e8me.<\/p>\n<p>Cependant, le comportement exact d\u00e9pend du syst\u00e8me de commande et de la conception du circuit de s\u00e9curit\u00e9.<\/p>\n<p><!-- \u56fe\u72472 --><img decoding=\"async\" src=\"https:\/\/onpowbutton.com\/wp-content\/uploads\/2026\/07\/emergency-stop-push-button-switches.webp\" alt=\"Emergency stop push button switches\" \/><\/p>\n<hr \/>\n<h2>Quand devez-vous choisir un interrupteur normalement ouvert ?<\/h2>\n<p>Choisissez un interrupteur normalement ouvert lorsque vous souhaitez qu&#x27;une action ou un signal ne se produise qu&#x27;apr\u00e8s l&#x27;activation de l&#x27;interrupteur.<\/p>\n<p>Un avis de non-contact peut convenir pour :<\/p>\n<h3>Boutons de d\u00e9marrage de machine<\/h3>\n<p>Une machine ne doit g\u00e9n\u00e9ralement pas red\u00e9marrer automatiquement apr\u00e8s le r\u00e9tablissement de l'alimentation. Un bouton de d\u00e9marrage NO n\u00e9cessite une action d\u00e9lib\u00e9r\u00e9e de l'op\u00e9rateur.<\/p>\n<h3>Entr\u00e9es de signal et de commande<\/h3>\n<p>Un interrupteur NO peut envoyer un signal lorsqu'il est actionn\u00e9, comme allumer une lumi\u00e8re, activer un relais ou lancer un processus.<\/p>\n<h3>Commandes par bouton poussoir momentan\u00e9<\/h3>\n<p>De nombreux boutons poussoirs momentan\u00e9s utilisent des contacts NO (normalement ouverts) car le circuit se ferme uniquement pendant que le bouton est enfonc\u00e9.<\/p>\n<h3>Actions initi\u00e9es par l'utilisateur<\/h3>\n<p>Si le but est de d\u00e9marrer, d'activer ou de d\u00e9clencher une fonction, un contact NO est souvent le choix logique.<\/p>\n<hr \/>\n<h2>Quand devriez-vous choisir un interrupteur normalement ferm\u00e9 ?<\/h2>\n<p>Choisissez un interrupteur normalement ferm\u00e9 lorsque le circuit doit rester actif pendant le fonctionnement normal et s'ouvrir lorsqu'une action de s\u00e9curit\u00e9 ou un d\u00e9faut se produit.<\/p>\n<p>Un contact NF peut convenir pour :<\/p>\n<h3>Boutons d'arr\u00eat d'urgence<\/h3>\n<p>Les contacts NC sont largement utilis\u00e9s dans les circuits de commande d'arr\u00eat d'urgence parce que l'actionnement du bouton ouvre le circuit.<\/p>\n<h3>Dispositifs de protection et inter verrouillages<\/h3>\n<p>Un circuit NF peut surveiller si une porte de protection ou un protecteur de machine reste dans la position correcte.<\/p>\n<h3>D\u00e9tection de d\u00e9fauts<\/h3>\n<p>Si un fil est d\u00e9branch\u00e9, le circuit peut s'ouvrir et permettre au syst\u00e8me de d\u00e9tecter une panne \u00e9ventuelle.<\/p>\n<h3>Fonctions d'arr\u00eat<\/h3>\n<p>De nombreux boutons d'arr\u00eat utilisent des contacts NF (normalement ferm\u00e9s) car l'action d'appuyer sur le bouton interrompt le circuit de commande.<\/p>\n<hr \/>\n<h2>NON vs. NC : Comparaison rapide<\/h2>\n<table border=\"1\" cellspacing=\"0\" cellpadding=\"8\">\n<thead>\n<tr>\n<th><strong>Fonctionnalit\u00e9<\/strong><\/th>\n<th><strong>Normalement ouvert (NO)<\/strong><\/th>\n<th><strong>Normalement ferm\u00e9 (NF)<\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u00c9tat normal du circuit<\/td>\n<td>Ouvrir<\/td>\n<td>Ferm\u00e9<\/td>\n<\/tr>\n<tr>\n<td>Le courant circule normalement<\/td>\n<td>Non<\/td>\n<td>Oui<\/td>\n<\/tr>\n<tr>\n<td>Changement de contact lors de l'activation<\/td>\n<td>Ferme<\/td>\n<td>Ouvre<\/td>\n<\/tr>\n<tr>\n<td>Fonction commune<\/td>\n<td>D\u00e9marrer ou activer<\/td>\n<td>Stop or monitor<\/td>\n<\/tr>\n<tr>\n<td>Typical application<\/td>\n<td>Start button<\/td>\n<td>Bouton d'arr\u00eat d'urgence<\/td>\n<\/tr>\n<tr>\n<td>Can help detect broken wiring<\/td>\n<td>Usually limited<\/td>\n<td>Often more effective<\/td>\n<\/tr>\n<tr>\n<td>Common use in safety circuits<\/td>\n<td>Application-dependent<\/td>\n<td>Frequently used<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h2>Can a Switch Have Both NO and NC Contacts?<\/h2>\n<p>Yes. Many industrial push button switches are available with both NO and NC contact configurations.<\/p>\n<p>A switch may have:<\/p>\n<ul>\n<li>1 NO<\/li>\n<li>1NC<\/li>\n<li>1NO + 1NC<\/li>\n<li>2NO<\/li>\n<li>2NF<\/li>\n<li>Multiple contact combinations<\/li>\n<\/ul>\n<p>A combined 1NO + 1NC switch can perform different functions within the same control system.<\/p>\n<p>Par exemple :<\/p>\n<ul>\n<li>The NO contact can send a start or control signal.<\/li>\n<li>The NC contact can interrupt another circuit or provide status monitoring.<\/li>\n<\/ul>\n<p>This can simplify control panel design and provide more flexibility.<\/p>\n<p>Before purchasing, check the switch specifications carefully because the available contact configurations may vary by model.<\/p>\n<hr \/>\n<h2>Is NC Always Safer Than NO?<\/h2>\n<p>No. NC is not automatically safer in every situation.<\/p>\n<p>An NC contact is often preferred for safety monitoring because an open circuit can indicate that a button has been pressed or that a connection may have failed. However, safety depends on the complete system design.<\/p>\n<p>For example, an NO switch may be the safer choice for a machine start function because the machine should require a deliberate action before starting.<\/p>\n<p>The better question is:<\/p>\n<p><strong>What should happen when the switch is activated, disconnected, or damaged?<\/strong><\/p>\n<p>If the system should stop or enter a safe state when the circuit is interrupted, an NC contact may be appropriate.<\/p>\n<p>If the system should operate only after a deliberate action closes the circuit, an NO contact may be more suitable.<\/p>\n<hr \/>\n<h2>How to Choose the Right NO or NC Switch<\/h2>\n<p>Before selecting a switch, consider the following questions.<\/p>\n<h3>1. What Is the Switch Required to Do?<\/h3>\n<p>Is the switch intended to:<\/p>\n<ul>\n<li>Start a machine?<\/li>\n<li>Stop a machine?<\/li>\n<li>Trigger a signal?<\/li>\n<li>Activate a relay?<\/li>\n<li>Monitor a safety guard?<\/li>\n<li>Interrupt a control circuit?<\/li>\n<\/ul>\n<p>The required function is usually the first factor to consider.<\/p>\n<h3>2. What Should Happen If a Wire Breaks?<\/h3>\n<p>For safety-related circuits, consider how the system should respond to a disconnected or damaged wire.<\/p>\n<p>If the system should stop when the circuit is interrupted, an NC configuration may provide a more suitable design.<\/p>\n<h3>3. Is the Application Safety-Critical?<\/h3>\n<p>Emergency stop systems, machine guards, and protective interlocks may require additional safety components and specialised control systems.<\/p>\n<p>Do not select a switch based only on whether it is NO or NC. Check the relevant safety requirements for the complete application.<\/p>\n<h3>4. What Electrical Rating Is Required?<\/h3>\n<p>Check the switch specifications, including:<\/p>\n<ul>\n<li>Rated voltage<\/li>\n<li>Rated current<\/li>\n<li>Contact rating<\/li>\n<li>AC or DC compatibility<\/li>\n<li>Load type<\/li>\n<li>Vie \u00e9lectrique<\/li>\n<\/ul>\n<p>A switch with the correct contact type may still be unsuitable if its electrical rating does not match the application.<\/p>\n<h3>5. What Operating Environment Will the Switch Face?<\/h3>\n<p>Consider:<\/p>\n<ul>\n<li>Water exposure<\/li>\n<li>Dust<\/li>\n<li>Oil<\/li>\n<li>Vibration<\/li>\n<li>High or low temperatures<\/li>\n<li>Outdoor installation<\/li>\n<\/ul>\n<p>For demanding industrial environments, an appropriate protection rating may be important.<\/p>\n<hr \/>\n<h2>Choosing ONPOW Normally Open and Normally Closed Switches<\/h2>\n<p><a style=\"color: red;\" href=\"https:\/\/onpowbutton.com\/fr\/\"><strong>ONPOW<\/strong><\/a> offers industrial push button switches with a range of normally open switch and normally closed switch contact options.<\/p>\n<p>Depending on the product series, buyers can select different configurations to support functions such as:<\/p>\n<ul>\n<li>Machine start and stop control<\/li>\n<li>Emergency stop operation<\/li>\n<li>Panneaux de contr\u00f4le industriels<\/li>\n<li>Equipment monitoring<\/li>\n<li>Automation systems<\/li>\n<li>Custom control applications<\/li>\n<\/ul>\n<p>ONPOW push button switches are available in different mounting sizes, materials, actuator styles, illumination options, and protection levels. This allows buyers to choose a switch based on both electrical requirements and installation conditions.<\/p>\n<p>When selecting an ONPOW switch, check the product specifications to confirm the available NO and NC contact configurations for the chosen model.<\/p>\n<hr \/>\n<p><!-- \u56fe\u72473 --><img decoding=\"async\" src=\"https:\/\/onpowbutton.com\/wp-content\/uploads\/2026\/07\/Certificate.webp\" alt=\"ONPOW product certificates\" \/><\/p>\n<hr \/>\n<h2>Questions Fr\u00e9quemment Pos\u00e9es<\/h2>\n<h3>Is normally closed safer than normally open?<\/h3>\n<p>For many safety circuits, an NC switch is considered more suitable because a broken wire or disconnected connection may open the circuit and trigger a fault or stop response. However, safety depends on the complete system design.<\/p>\n<h3>Is an emergency stop button normally open or normally closed?<\/h3>\n<p>Emergency stop buttons commonly use normally closed contacts. Pressing the button opens the safety circuit and sends a stop signal.<\/p>\n<h3>Is a start button normally open or normally closed?<\/h3>\n<p>A machine start button commonly uses a normally open contact. Pressing the button closes the circuit and sends a start command.<\/p>\n<h3>What does 1NO and 1NC mean?<\/h3>\n<p>1NO means one normally open contact. 1NC means one normally closed contact.<\/p>\n<p>A 1NO + 1NC configuration includes one normally open contact and one normally closed contact.<\/p>\n<h3>Can I use an NO switch as a stop button?<\/h3>\n<p>An NO contact can be used in some control designs, but it may not provide the same fault-monitoring behaviour as an NC stop circuit. The correct configuration depends on the control system and safety requirements.<\/p>\n<h3>Can I use an NC switch as a start button?<\/h3>\n<p>An NC switch can be used for certain control functions, but it is generally not the typical choice for a standard machine start command. A normally open contact is often more suitable because the operator must actively close the circuit to start the machine.<\/p>\n<hr \/>\n<h2>Pens\u00e9es finales<\/h2>\n<p>When comparing a normally open switch with a normally closed switch, neither contact type is universally best.<\/p>\n<p>A normally open switch is commonly used to start, activate, or trigger a function. A normally closed switch is often preferred for stop functions, safety monitoring, and applications where an interrupted circuit should produce a safe response.<\/p>\n<p>For many safety-related circuits, NC contacts provide an important fail-safe advantage. However, the final choice should always be based on the application, electrical requirements, control system, and relevant safety standards.<\/p>\n<p>Before purchasing, confirm the required contact configuration and review the switch specifications carefully. Choosing the correct NO or NC contact can improve system reliability, simplify control design, and support safer equipment operation.<\/p>","protected":false},"excerpt":{"rendered":"<p>When choosing a push button switch, limit switch, sensor, or safety control device, many buyers ask the same question: Which is safer, a normally open switch or a normally closed switch? The short answer is: A normally closed (NC) switch is generally safer for safety-critical circuits because it can provide fail-safe monitoring. However, the safest [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":2254,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","footnotes":""},"categories":[1,98],"tags":[],"class_list":["post-2256","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-news"],"uagb_featured_image_src":{"full":["https:\/\/onpowbutton.com\/wp-content\/uploads\/2026\/08\/Which-is-safer-NO-or-NC.webp",1536,1024,false],"thumbnail":["https:\/\/onpowbutton.com\/wp-content\/uploads\/2026\/08\/Which-is-safer-NO-or-NC-150x150.webp",150,150,true],"medium":["https:\/\/onpowbutton.com\/wp-content\/uploads\/2026\/08\/Which-is-safer-NO-or-NC-300x200.webp",300,200,true],"medium_large":["https:\/\/onpowbutton.com\/wp-content\/uploads\/2026\/08\/Which-is-safer-NO-or-NC-768x512.webp",768,512,true],"large":["https:\/\/onpowbutton.com\/wp-content\/uploads\/2026\/08\/Which-is-safer-NO-or-NC-1024x683.webp",1024,683,true],"1536x1536":["https:\/\/onpowbutton.com\/wp-content\/uploads\/2026\/08\/Which-is-safer-NO-or-NC.webp",1536,1024,false],"2048x2048":["https:\/\/onpowbutton.com\/wp-content\/uploads\/2026\/08\/Which-is-safer-NO-or-NC.webp",1536,1024,false],"trp-custom-language-flag":["https:\/\/onpowbutton.com\/wp-content\/uploads\/2026\/08\/Which-is-safer-NO-or-NC-18x12.webp",18,12,true]},"uagb_author_info":{"display_name":"hongbo","author_link":"https:\/\/onpowbutton.com\/fr\/author\/hongbo\/"},"uagb_comment_info":0,"uagb_excerpt":"When choosing a push button switch, limit switch, sensor, or safety control device, many buyers ask the same question: Which is safer, a normally open switch or a normally closed switch? The short answer is: A normally closed (NC) switch is generally safer for safety-critical circuits because it can provide fail-safe monitoring. However, the safest\u2026","_links":{"self":[{"href":"https:\/\/onpowbutton.com\/fr\/wp-json\/wp\/v2\/posts\/2256","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/onpowbutton.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/onpowbutton.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/onpowbutton.com\/fr\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/onpowbutton.com\/fr\/wp-json\/wp\/v2\/comments?post=2256"}],"version-history":[{"count":1,"href":"https:\/\/onpowbutton.com\/fr\/wp-json\/wp\/v2\/posts\/2256\/revisions"}],"predecessor-version":[{"id":2257,"href":"https:\/\/onpowbutton.com\/fr\/wp-json\/wp\/v2\/posts\/2256\/revisions\/2257"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/onpowbutton.com\/fr\/wp-json\/wp\/v2\/media\/2254"}],"wp:attachment":[{"href":"https:\/\/onpowbutton.com\/fr\/wp-json\/wp\/v2\/media?parent=2256"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/onpowbutton.com\/fr\/wp-json\/wp\/v2\/categories?post=2256"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/onpowbutton.com\/fr\/wp-json\/wp\/v2\/tags?post=2256"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}