{"id":7515,"date":"2026-11-13T17:14:37","date_gmt":"2026-11-13T09:14:37","guid":{"rendered":"https:\/\/www.metal-domes.com\/blog\/?p=7515"},"modified":"2026-11-13T17:15:15","modified_gmt":"2026-11-13T09:15:15","slug":"metal-dome-switching-capacity","status":"publish","type":"post","link":"https:\/\/www.metal-domes.com\/blog\/2026\/11\/13\/metal-dome-switching-capacity\/","title":{"rendered":"Metal Dome Switching Capacity: What Do Voltage and Current Ratings Mean?"},"content":{"rendered":"<div class=\"yzp-no-index\"><\/div><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_69_1 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<div class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/div>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.metal-domes.com\/blog\/2026\/11\/13\/metal-dome-switching-capacity\/#What_Is_Metal_Dome_Switching_Capacity\" title=\"What Is Metal Dome Switching Capacity?\">What Is Metal Dome Switching Capacity?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.metal-domes.com\/blog\/2026\/11\/13\/metal-dome-switching-capacity\/#What_Is_the_Metal_Dome_Current_Rating_for_Our_C-_and_F-Series\" title=\"What Is the Metal Dome Current Rating for Our C- and F-Series?\">What Is the Metal Dome Current Rating for Our C- and F-Series?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.metal-domes.com\/blog\/2026\/11\/13\/metal-dome-switching-capacity\/#What_Is_the_Metal_Dome_Voltage_Rating\" title=\"What Is the Metal Dome Voltage Rating?\">What Is the Metal Dome Voltage Rating?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.metal-domes.com\/blog\/2026\/11\/13\/metal-dome-switching-capacity\/#Why_Is_Breakdown_Voltage_Different_From_Switching_Voltage\" title=\"Why Is Breakdown Voltage Different From Switching Voltage?\">Why Is Breakdown Voltage Different From Switching Voltage?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.metal-domes.com\/blog\/2026\/11\/13\/metal-dome-switching-capacity\/#Can_Voltage_and_Current_Ratings_Be_Multiplied_Into_a_New_Limit\" title=\"Can Voltage and Current Ratings Be Multiplied Into a New Limit?\">Can Voltage and Current Ratings Be Multiplied Into a New Limit?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.metal-domes.com\/blog\/2026\/11\/13\/metal-dome-switching-capacity\/#How_Do_Loose_Domes_and_SMD_Dome_Switches_Differ_Electrically\" title=\"How Do Loose Domes and SMD Dome Switches Differ Electrically?\">How Do Loose Domes and SMD Dome Switches Differ Electrically?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.metal-domes.com\/blog\/2026\/11\/13\/metal-dome-switching-capacity\/#How_Do_You_Calculate_Current_Through_a_Dome_Switch\" title=\"How Do You Calculate Current Through a Dome Switch?\">How Do You Calculate Current Through a Dome Switch?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.metal-domes.com\/blog\/2026\/11\/13\/metal-dome-switching-capacity\/#What_Changes_With_Capacitive_and_Inductive_Loads\" title=\"What Changes With Capacitive and Inductive Loads?\">What Changes With Capacitive and Inductive Loads?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.metal-domes.com\/blog\/2026\/11\/13\/metal-dome-switching-capacity\/#Does_Dome_Shape_or_Plating_Raise_the_Electrical_Rating\" title=\"Does Dome Shape or Plating Raise the Electrical Rating?\">Does Dome Shape or Plating Raise the Electrical Rating?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.metal-domes.com\/blog\/2026\/11\/13\/metal-dome-switching-capacity\/#How_Do_Contact_Pads_and_Dome_Retention_Affect_Closure\" title=\"How Do Contact Pads and Dome Retention Affect Closure?\">How Do Contact Pads and Dome Retention Affect Closure?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.metal-domes.com\/blog\/2026\/11\/13\/metal-dome-switching-capacity\/#How_Should_You_Test_the_Intended_Switching_Load\" title=\"How Should You Test the Intended Switching Load?\">How Should You Test the Intended Switching Load?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.metal-domes.com\/blog\/2026\/11\/13\/metal-dome-switching-capacity\/#What_Electrical_Details_Should_Be_in_the_Dome_Specification\" title=\"What Electrical Details Should Be in the Dome Specification?\">What Electrical Details Should Be in the Dome Specification?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.metal-domes.com\/blog\/2026\/11\/13\/metal-dome-switching-capacity\/#Metal_Dome_Switching_Capacity_FAQs\" title=\"Metal Dome Switching Capacity FAQs\">Metal Dome Switching Capacity FAQs<\/a><\/li><\/ul><\/nav><\/div>\n\n\n\n\n\n<p><a href=\"https:\/\/www.metal-domes.com\/blog\/2026\/11\/13\/metal-dome-switching-capacity\/\">Metal dome switching capacity<\/a> is the electrical load a specified dome contact can make and break under its stated conditions. It is not the force needed to produce a click. For our loose C- and F-series domes, the published maximum is 12 mA at 24 V DC; our packaged SMD dome switch page lists a different rating, 50 mA at 12 V DC. Before selecting either, determine what the contact actually switches, including any current surge at closure.<\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.metal-domes.com\/blog\/wp-content\/uploads\/2026\/11\/metal-dome-switching-capacity-hero.jpg\" alt=\"Metal dome on PCB contact pads with the full switching-capacity article title\" width=\"600\" height=\"400\" class=\"wp-image-7511\" srcset=\"https:\/\/www.metal-domes.com\/blog\/wp-content\/uploads\/2026\/11\/metal-dome-switching-capacity-hero.jpg 600w, https:\/\/www.metal-domes.com\/blog\/wp-content\/uploads\/2026\/11\/metal-dome-switching-capacity-hero-300x200.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Is_Metal_Dome_Switching_Capacity\"><\/span>What Is Metal Dome Switching Capacity?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>When a metal dome is pressed, its center touches the center contact while its rim or legs remain on the outer contact. The open circuit closes, then opens again when the dome returns. The <strong>dome switch electrical rating<\/strong> describes the load at those contact transitions, normally with a stated voltage, current, load type and test condition. Mechanical life and actuation force describe different properties.<\/p>\n\n\n<p>A voltage\/current pair should be read as a condition for that product, not as a universal rating for every metal dome. The assembled contact path includes the dome, PCB pads, finish and retention stack. A change to that stack can change the behavior that has to be tested.<\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.metal-domes.com\/blog\/wp-content\/uploads\/2026\/11\/metal-dome-switching-capacity-contacts.jpg\" alt=\"Four-leg metal dome above separate center and outer PCB contact pads\" width=\"600\" height=\"400\" class=\"wp-image-7512\" srcset=\"https:\/\/www.metal-domes.com\/blog\/wp-content\/uploads\/2026\/11\/metal-dome-switching-capacity-contacts.jpg 600w, https:\/\/www.metal-domes.com\/blog\/wp-content\/uploads\/2026\/11\/metal-dome-switching-capacity-contacts-300x200.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Is_the_Metal_Dome_Current_Rating_for_Our_C-_and_F-Series\"><\/span>What Is the Metal Dome Current Rating for Our C- and F-Series?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>The <strong>metal dome current rating<\/strong> on our <a href=\"https:\/\/www.metal-domes.com\/product\/metal-dome-C-Series.htm\">C-series round dome<\/a> and <a href=\"https:\/\/www.metal-domes.com\/product\/metal-dome-F-Series.htm\">F-series four-leg dome<\/a> product pages is a maximum of <strong>12 mA at 24 V DC<\/strong>. The C-series listing identifies a resistive load (RL). This is a low-current signal-switching specification, not permission to put a motor, lamp or other load directly through a bare dome contact.<\/p>\n\n\n<p>The current path is the current through the closed contact, not merely the current consumed by the whole device. If a microcontroller input has a pull-up resistor, calculate its switch current from that branch. If the dome directly feeds another load, inspect the load&#8217;s startup and fault behavior as well as its steady current.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Is_the_Metal_Dome_Voltage_Rating\"><\/span>What Is the Metal Dome Voltage Rating?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>The <strong>metal dome voltage rating<\/strong> is the voltage present across the contact in the intended switching circuit. Our C- and F-series pages specify their 12 mA maximum together with <strong>24 V DC<\/strong>. A design at 24 V does not pass merely because its nominal current is small: the contact also has to make and break the actual load without unacceptable resistance change, sticking or damage.<\/p>\n\n\n<p>Do not extend a DC rating to an AC waveform or a higher-voltage circuit by analogy. If the circuit differs from the listed conditions, send us the actual voltage, current and load description so we can assess the dome and contact stack for that application.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_Is_Breakdown_Voltage_Different_From_Switching_Voltage\"><\/span>Why Is Breakdown Voltage Different From Switching Voltage?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>Our loose-dome specification pages also list a breakdown-voltage figure above 200 V. That is not a 200 V switching rating. Breakdown or dielectric withstand concerns insulation under a specified test; switching concerns repeated opening and closing at energized contacts. Using the larger number as the operating voltage would confuse two different tests.<\/p>\n\n\n<p>For a switching decision, start with the listed 24 V DC \/ 12 mA operating pair for the referenced loose series, then check the complete circuit. If a project needs a different voltage or insulation requirement, specify both separately on the drawing.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Can_Voltage_and_Current_Ratings_Be_Multiplied_Into_a_New_Limit\"><\/span>Can Voltage and Current Ratings Be Multiplied Into a New Limit?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>Multiplying 24 V by 12 mA gives 0.288 W for that arithmetic point. It does <em>not<\/em> create a published 0.288 W switching-capacity curve or permit a different pair such as higher current at lower voltage. Contact heating, the arc or transient at separation, and contact material behavior need not scale with the same product of V and I.<\/p>\n\n\n<p>If a data sheet separately lists a maximum power, the named voltage, current and power limits must all be respected for that exact part. A wattage entry from another product cannot be transferred to our C- or F-series. Use the specified operating pair and qualify the intended load.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Do_Loose_Domes_and_SMD_Dome_Switches_Differ_Electrically\"><\/span>How Do Loose Domes and SMD Dome Switches Differ Electrically?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>A loose dome sits on a designed PCB contact pattern and needs a retention method. Our <a href=\"https:\/\/www.metal-domes.com\/SMD-dome-switch.htm\">SMD dome switch<\/a> is a packaged, solderable component with its own terminals and construction. Its published rating is <strong>50 mA at 12 V DC<\/strong>. That higher current number does not upgrade an un-packaged dome or turn a loose dome into a reflow-solderable part.<\/p>\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Our product<\/th><th>Published electrical entry<\/th><th>What must be checked in the assembly<\/th><\/tr><\/thead><tbody><tr><td>C-series round loose dome<\/td><td>12 mA at 24 V DC; C-series page marks RL<\/td><td>PCB contacts, retention and actual load<\/td><\/tr><tr><td>F-series four-leg loose dome<\/td><td>12 mA at 24 V DC<\/td><td>Outer-leg and center-pad contact geometry<\/td><\/tr><tr><td>Packaged SMD dome switch<\/td><td>50 mA at 12 V DC<\/td><td>Exact package part number, soldered terminals and load<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.metal-domes.com\/blog\/wp-content\/uploads\/2026\/11\/metal-dome-switching-capacity-shapes.jpg\" alt=\"Round dome and four-leg dome shown side by side to distinguish contact geometry\" width=\"600\" height=\"400\" class=\"wp-image-7513\" srcset=\"https:\/\/www.metal-domes.com\/blog\/wp-content\/uploads\/2026\/11\/metal-dome-switching-capacity-shapes.jpg 600w, https:\/\/www.metal-domes.com\/blog\/wp-content\/uploads\/2026\/11\/metal-dome-switching-capacity-shapes-300x200.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Do_You_Calculate_Current_Through_a_Dome_Switch\"><\/span>How Do You Calculate Current Through a Dome Switch?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>Draw the current path with the switch closed. For a simple 5 V input pulled up through 4.7 kOhm and pulled to ground by the dome, the nominal closed-contact current is approximately <strong>5 V \/ 4.7 kOhm = 1.06 mA<\/strong>, before accounting for the input and circuit tolerances. This is an example calculation, not a new dome rating. Also identify the voltage across the open contacts and the supply&#8217;s possible variation.<\/p>\n\n\n<p>Where the load is not a resistor, a steady-state division is insufficient. A capacitor can draw a short charging pulse; a coil can produce a turn-off transient. Review the circuit schematic and measure the waveform at the contact rather than relying on the device&#8217;s average supply current.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Changes_With_Capacitive_and_Inductive_Loads\"><\/span>What Changes With Capacitive and Inductive Loads?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>A capacitive input or long cable can make the closure current briefly exceed its settled value. An inductive load can create a voltage transient as the dome opens. Neither condition is represented completely by a resistive-load current calculated from V\/R. If the dome switches such a load directly, provide the load type, capacitance or inductance, supply and protective circuit details for review.<\/p>\n\n\n<p>One practical option is to have the dome command an electronic input while a separate device switches the power load. Whether that arrangement works depends on the input&#8217;s current and noise margin; it still needs an electrical test in the final contact assembly.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Does_Dome_Shape_or_Plating_Raise_the_Electrical_Rating\"><\/span>Does Dome Shape or Plating Raise the Electrical Rating?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>Round and four-leg domes contact the board differently, and available finishes affect the contact interface. But a changed shape, larger diameter or gold-plated surface is not an automatic license to exceed the named product&#8217;s voltage\/current rating. The revised dome, pad finish and load have to be assessed together.<\/p>\n\n\n<p>For very small sensing currents, the relevant concern can be stable closure at low energy rather than maximum current. That is a different question from switching capacity; our <a href=\"https:\/\/www.metal-domes.com\/blog\/2026\/10\/30\/wetting-current\/\">wetting-current discussion<\/a> covers that side of contact behavior.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Do_Contact_Pads_and_Dome_Retention_Affect_Closure\"><\/span>How Do Contact Pads and Dome Retention Affect Closure?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>A bare dome&#8217;s electrical path is completed by the customer&#8217;s PCB or membrane contacts. The rim or legs must land on the intended outer pad, while the center must touch only the center pad at actuation. An offset dome, contaminated pad, warped support or adhesive crossing the contact area can cause intermittent closure even when the nominal voltage and current are within the listed rating.<\/p>\n\n\n<p>We therefore check the dome drawing together with the pad layout and retention stack when discussing a new array. The electrical rating of the loose metal part alone cannot certify an incorrectly laid-out or assembled switch.<\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.metal-domes.com\/blog\/wp-content\/uploads\/2026\/11\/metal-dome-switching-capacity-array.jpg\" alt=\"Real metal dome array on a PCB showing separate dome positions and retention film\" width=\"600\" height=\"400\" class=\"wp-image-7514\" srcset=\"https:\/\/www.metal-domes.com\/blog\/wp-content\/uploads\/2026\/11\/metal-dome-switching-capacity-array.jpg 600w, https:\/\/www.metal-domes.com\/blog\/wp-content\/uploads\/2026\/11\/metal-dome-switching-capacity-array-300x200.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Should_You_Test_the_Intended_Switching_Load\"><\/span>How Should You Test the Intended Switching Load?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>Build a representative dome-and-PCB stack, use the intended actuator and apply the actual circuit load. Record the open-contact voltage, current waveform at closure, any opening transient, contact resistance or voltage drop after closure, and the pass\/fail limits agreed for the project. Repeat after the specified cycling and environmental exposure; compare with the initial measurement rather than judging by tactile click alone.<\/p>\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Test moment<\/th><th>Measure or observe<\/th><th>What it can reveal<\/th><\/tr><\/thead><tbody><tr><td>Before actuation<\/td><td>Voltage across the open contacts and leakage<\/td><td>Operating voltage or insulation issue<\/td><\/tr><tr><td>At closure<\/td><td>Peak and settled current, contact waveform<\/td><td>Inrush, bounce or unstable contact<\/td><\/tr><tr><td>At release<\/td><td>Transient voltage and reopening behavior<\/td><td>Inductive spike or contact sticking<\/td><\/tr><tr><td>After cycling<\/td><td>Contact drop\/resistance, closure consistency, visual condition<\/td><td>Wear, contamination or changed pad interface<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Electrical_Details_Should_Be_in_the_Dome_Specification\"><\/span>What Electrical Details Should Be in the Dome Specification?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>For a useful specification review, identify the dome or switch part number, contact-pad drawing, closed-contact current, open-contact voltage, load type, any measured inrush or release spike, required cycle count and the operating environment. State whether the design uses a loose dome, an adhesive array or a solderable packaged switch. These are different constructions with different assembly and electrical checks.<\/p>\n\n\n<p>At EBest Circuit(Best Technology), we can review the proposed dome geometry and supply format against the circuit information you provide. If the duty exceeds the listed product rating, the answer is to review the circuit and component choice, not to relabel a mechanical or breakdown figure as a higher switching rating.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Metal_Dome_Switching_Capacity_FAQs\"><\/span>Metal Dome Switching Capacity FAQs<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<h3>Is the actuation force the same as the electrical rating?<\/h3>\n<p>No. Actuation force determines when the spring snaps; voltage and current limits describe the contact&#8217;s switching duty. Both must match the chosen assembly.<\/p>\n<h3>Can two domes in parallel double the current rating?<\/h3>\n<p>No. The contacts will not necessarily close or share current at the same instant. A parallel arrangement needs its own circuit analysis and test; it does not double an individual dome&#8217;s published limit.<\/p>\n<h3>Can a scanned keypad use average supply current as its contact current?<\/h3>\n<p>No. Determine the instantaneous current through the closed dome during the scan, including any charging pulse. The device&#8217;s average supply current does not describe that contact event.<\/p>\n\n\n<p>Send us the circuit conditions and contact drawing at <a href=\"https:\/\/www.metal-domes.com\/Contactbest.htm\">sales@metal-domes.com<\/a> to discuss the appropriate metal dome or packaged switch.<\/p>\n\n\n<p>The practical meaning of <a href=\"https:\/\/www.metal-domes.com\/blog\/2026\/11\/13\/metal-dome-switching-capacity\/\">metal dome switching capacity<\/a> is simple: compare the named part&#8217;s stated voltage and current with the load actually made and broken in your complete switch stack, then verify that stack under its intended duty.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Check metal dome switching capacity against the actual circuit load, and distinguish our loose dome ratings from packaged SMD switch ratings. <a href=\"https:\/\/www.metal-domes.com\/blog\/2026\/11\/13\/metal-dome-switching-capacity\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":57789,"featured_media":7511,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[100,3],"tags":[1462,1460,1459,1461],"class_list":["post-7515","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-metal-dome-assembly-2","category-metal-domes","tag-dome-switch-electrical-rating","tag-metal-dome-current-rating","tag-metal-dome-switching-capacity","tag-metal-dome-voltage-rating"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.metal-domes.com\/blog\/wp-json\/wp\/v2\/posts\/7515","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.metal-domes.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.metal-domes.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.metal-domes.com\/blog\/wp-json\/wp\/v2\/users\/57789"}],"replies":[{"embeddable":true,"href":"https:\/\/www.metal-domes.com\/blog\/wp-json\/wp\/v2\/comments?post=7515"}],"version-history":[{"count":2,"href":"https:\/\/www.metal-domes.com\/blog\/wp-json\/wp\/v2\/posts\/7515\/revisions"}],"predecessor-version":[{"id":7517,"href":"https:\/\/www.metal-domes.com\/blog\/wp-json\/wp\/v2\/posts\/7515\/revisions\/7517"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.metal-domes.com\/blog\/wp-json\/wp\/v2\/media\/7511"}],"wp:attachment":[{"href":"https:\/\/www.metal-domes.com\/blog\/wp-json\/wp\/v2\/media?parent=7515"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.metal-domes.com\/blog\/wp-json\/wp\/v2\/categories?post=7515"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.metal-domes.com\/blog\/wp-json\/wp\/v2\/tags?post=7515"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}