{"id":1143,"date":"2026-10-13T08:49:08","date_gmt":"2026-10-13T08:49:08","guid":{"rendered":"https:\/\/liqele.com\/?p=1143"},"modified":"2026-10-15T08:10:17","modified_gmt":"2026-10-15T08:10:17","slug":"what-is-a-vacuum-circuit-breaker","status":"publish","type":"post","link":"https:\/\/liqele.com\/es\/what-is-a-vacuum-circuit-breaker\/","title":{"rendered":"\u00bfQu\u00e9 es un interruptor de vac\u00edo? Estructura, principio de funcionamiento y aplicaciones"},"content":{"rendered":"<style>.liq-prelaunch-article{max-width:900px;margin:0 auto;line-height:1.7}.liq-prelaunch-article h2{margin-top:2.2em}.liq-prelaunch-article h3{margin-top:1.7em}.liq-prelaunch-article figure{margin:2em 0}.liq-prelaunch-article img{display:block;max-width:100%;height:auto;margin:auto}.liq-prelaunch-article figcaption{font-size:.9em;line-height:1.5;color:#555;margin-top:.7em}.liq-prelaunch-article .liq-table-scroll{max-width:100%;overflow-x:auto;margin:1.5em 0}.liq-prelaunch-article table{display:table;width:100%;border-collapse:collapse;margin:0}.liq-prelaunch-article th,.liq-prelaunch-article td{padding:.7em;border:1px solid #ddd;vertical-align:top;min-width:130px;overflow-wrap:normal;word-break:normal;hyphens:none}.liq-prelaunch-article th{background:#f4f4f4}.liq-prelaunch-article a{text-decoration:underline;overflow-wrap:anywhere}@media(max-width:600px){.liq-prelaunch-article{font-size:16px}.liq-prelaunch-article .liq-table-scroll table{min-width:660px}.liq-prelaunch-article .liq-table-scroll[data-columns=\"2\"] table{min-width:600px;table-layout:fixed}.liq-prelaunch-article .liq-table-scroll::before{content:\"Swipe to read all columns\";display:block;position:sticky;left:0;font-size:13px;color:#555;margin-bottom:8px}.liq-prelaunch-article th,.liq-prelaunch-article td{padding:.65em;min-width:180px}}<\/style>\n<style>body.single-post .hero-section[data-type=\"type-1\"]{padding-top:140px;padding-bottom:30px;background:#fff}body.single-post .hero-section[data-type=\"type-1\"] .page-title{color:#151515!important;font-size:clamp(2rem,2.7vw,2.65rem);line-height:1.2}@media(max-width:600px){body.single-post .hero-section[data-type=\"type-1\"]{padding-top:160px;padding-bottom:24px}}<\/style>\n<div class=\"liq-prelaunch-article\" data-liq-article=\"PL11\" lang=\"en\">\n<h2>Quick Takeaway<\/h2>\n<ul>\n<li>A vacuum circuit breaker interrupts current inside sealed vacuum chambers. Contact separation can still produce a metal-vapour arc; successful AC interruption requires arc extinction and enough dielectric recovery to withstand the returning voltage.<\/li>\n<li>The primary current path and the mechanical motion path meet at the moving-contact assembly. A flexible conductor carries current from that assembly, while an insulating rod transmits motion and the bellows maintains the sealed boundary.<\/li>\n<li>The vacuum principle does not determine the complete installation. Indoor panel interfaces, outdoor exposure and support, assigned switching duties and the selected control or protection arrangement still govern the required breaker configuration.<\/li>\n<\/ul>\n<p>A vacuum circuit breaker (VCB) is an AC switching device that carries current while it is closed, makes and breaks circuits on command, and interrupts fault current within the ratings and conditions assigned to it. The interruption itself takes place inside sealed vacuum interrupters, where the contacts separate, an arc forms between them, and that arc is extinguished so the gap can recover its dielectric strength. Everything around the interrupters \u2014 the pole insulation, the primary terminals, the operating mechanism, the frame and the control interfaces \u2014 exists to connect them to the primary circuit, to drive their contacts, and to link the breaker to whatever issues commands to it.<\/p>\n<h2>What a Vacuum Circuit Breaker Does<\/h2>\n<p>A vacuum circuit breaker has two routine jobs and one emergency job. In normal service it carries the load current of the circuit it belongs to, and it switches that circuit on and off when the network or the process requires it: energizing a feeder, transferring a load, or de-energizing equipment before maintenance. Its emergency job is fault interruption \u2014 breaking a fault current within the ratings and conditions the breaker has been assigned.<\/p>\n<p>Both jobs pass through the same contacts, and that is why a breaker is described by a set of duties rather than by one figure. Continuous current carrying, making, breaking and short-time withstanding are different requirements, and a device that satisfies one of them is not automatically strong in the others. Those rating fields are examined in their own right in the separate article on <a href=\"https:\/\/liqele.com\/medium-voltage-switching-device-ratings\/\">medium-voltage switching device ratings<\/a>; the purpose here is to explain the physical object that has to meet them.<\/p>\n<p>The word vacuum in the name identifies the medium in which the arc is interrupted. It does not describe the insulation outside the interrupter, the enclosure around the breaker, the way the breaker is mounted, or the sensing and protection equipment that decides when a fault exists. Those are separate items, chosen separately, and two devices both sold as vacuum circuit breakers can differ in all of them. Three levels are worth keeping apart:<\/p>\n<ul>\n<li>The vacuum interrupter: the sealed device holding the fixed contact, the moving contact, and the evacuated space between them.<\/li>\n<li>The complete vacuum circuit breaker: the interrupter or interrupters, plus pole assemblies, primary terminals, operating mechanism, frame and control interfaces.<\/li>\n<li>The switchgear and protection arrangement: the panel or outdoor installation, primary connections, current transformers or sensors, relays or controllers, interlocks and auxiliary circuits that surround the breaker.<\/li>\n<\/ul>\n<p>Electrical interruption takes place inside the interrupter. The complete breaker supplies the contact motion, connections and interfaces, while the installation supplies the required control, protection and access arrangements.<\/p>\n<figure class=\"wp-block-image size-full\" data-media-role=\"featured\"><img class=\"wp-image-1300\" src=\"https:\/\/liqele.com\/wp-content\/uploads\/2026\/10\/featured-final-11.webp\" alt=\"Reference-based studio view of an indoor vacuum circuit breaker with front mechanism housing, rear insulated poles and wheeled chassis\" width=\"1672\" height=\"941\" loading=\"eager\" decoding=\"async\" fetchpriority=\"high\" srcset=\"https:\/\/liqele.com\/wp-content\/uploads\/2026\/10\/featured-final-11.webp 1672w, https:\/\/liqele.com\/wp-content\/uploads\/2026\/10\/featured-final-11-300x169.webp 300w, https:\/\/liqele.com\/wp-content\/uploads\/2026\/10\/featured-final-11-1024x576.webp 1024w, https:\/\/liqele.com\/wp-content\/uploads\/2026\/10\/featured-final-11-768x432.webp 768w, https:\/\/liqele.com\/wp-content\/uploads\/2026\/10\/featured-final-11-1536x864.webp 1536w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><figcaption>The complete breaker combines interrupter poles, primary connections, an operating mechanism and mounting interfaces; the sealed interrupter is one part of that assembly.<\/figcaption><\/figure>\n<h2>The Physical Parts and the Two Paths Through a Breaker<\/h2>\n<p>A complete indoor vacuum circuit breaker usually resolves into three visible groups. At the rear sit the pole assemblies, each carrying a sealed interrupter inside its own insulation. At the front sits the operating mechanism, behind a housing that also carries the control and indication interfaces. Between and around them is the frame or chassis, which provides the mounting points and, on withdrawable versions, the travelling arrangement that moves the whole breaker into and out of a panel.<\/p>\n<p>Inside each pole, the interrupter is a sealed envelope rather than an ordinary air gap. One contact is fixed and one moves, and each is carried on a stem that passes through the envelope wall. The fixed stem is permanently joined to the end plate and doubles as a terminal. The moving side has the harder problem, because a stem has to slide in and out while the interior stays sealed. A metal bellows wrapped around the moving stem solves it: as the stem travels, the bellows flexes and the vacuum boundary stays intact. Ceramic insulators form the main body of the envelope, metal end plates close it, and metal shields intercept arc products so that the ceramic is not coated with conducting metal vapour.<\/p>\n<p>Two relationships inside the pole are worth separating, because they are constantly merged in casual descriptions of breakers.<\/p>\n<p>The first is the current path. In the VS1-12 indoor breaker whose installation manual was used as the working example here, the closed-contact path runs from the upper terminal connection through the fixed contact, then the moving contact, then a conductive clamp and flexible connection, and out through the lower terminal connection. The flexible connection exists precisely because the moving side travels, and a rigid conductor could not follow it. The insulating rod that drives the moving contact is deliberately not part of that path; it transmits motion, and its insulating material is what allows the mechanism to sit at a different potential from the live contact.<\/p>\n<p>The second is the motion path, which runs from the stored-energy mechanism through the transmission shaft, linkage and insulating rod to the moving contact stem. That is covered later, because the two paths converge at the moving-contact assembly, while serving different electrical and mechanical functions.<\/p>\n<p>Outside the sealed envelope, pole construction differs between families in ways that affect external insulation, mechanical integration and fit, while current interruption remains inside the vacuum chamber. One arrangement mounts the interrupter longitudinally inside a tubular insulating cylinder, where the surrounding air completes the external insulation of the pole. Another embeds the interrupter in solid insulating material, so that the cast pole carries the interrupter and also provides the external terminals, the flexible connection, the contact-pressure spring and the interface to the mechanism. Both contain the same kind of sealed interrupter. They are different external arrangements rather than a ranking, and their dimensions, terminal positions and mounting interfaces do not carry over from one to the other.<\/p>\n<figure class=\"wp-block-image size-full\" data-media-role=\"inline\"><img class=\"wp-image-1301\" src=\"https:\/\/liqele.com\/wp-content\/uploads\/2026\/10\/fig01-final-11.webp\" alt=\"Simplified closed vacuum pole with a copper current route through matching contacts and a flexible connection, separate from a blue motion arrow on the insulating rod\" width=\"1670\" height=\"941\" loading=\"lazy\" decoding=\"async\" srcset=\"https:\/\/liqele.com\/wp-content\/uploads\/2026\/10\/fig01-final-11.webp 1670w, https:\/\/liqele.com\/wp-content\/uploads\/2026\/10\/fig01-final-11-300x169.webp 300w, https:\/\/liqele.com\/wp-content\/uploads\/2026\/10\/fig01-final-11-1024x577.webp 1024w, https:\/\/liqele.com\/wp-content\/uploads\/2026\/10\/fig01-final-11-768x433.webp 768w, https:\/\/liqele.com\/wp-content\/uploads\/2026\/10\/fig01-final-11-1536x865.webp 1536w\" sizes=\"auto, (max-width: 1670px) 100vw, 1670px\" \/><figcaption>The orange route identifies the primary conducting path without depicting AC direction. The blue arrow shows contact motion through the insulating rod; the flexible conductor serves the moving side of the current path.<\/figcaption><\/figure>\n<h2>How Current Interruption Works Inside the Vacuum Chamber<\/h2>\n<p>The name vacuum interrupter can create a false expectation: that because there is no air inside, no arc can form and the current simply stops when the contacts part. The reality is closer to the opposite. When contacts that are carrying current separate, the last points of contact heat intensely, contact metal vaporizes, and that vapour becomes the conducting medium of an arc. The arc burns in metal vapour released by the contacts themselves, not in air and not in a supplied gas. Vacuum is an excellent environment for extinguishing such an arc quickly; it is not an environment in which arcing is impossible.<\/p>\n<p>This is also why mechanical separation is not the same thing as electrical interruption. The mechanism may have completed its stroke and the contacts may be physically apart while current is still flowing through the arc between them. Until the arc is gone, the circuit is not broken.<\/p>\n<p>In alternating current, the natural way out is the current zero. Twice per cycle the current passes through zero, and at that instant the energy available to the arc column collapses. Near zero the arc can no longer be sustained: the plasma loses its conducting path, the arc goes out, and the metal vapour that carried it condenses onto the contact surfaces, the shields and the cooler parts of the chamber. With the vapour gone, the dielectric strength of the gap between the two contacts recovers. The chamber itself stays sealed throughout; it is not re-evacuated after each operation.<\/p>\n<p>Recovery is what decides whether the interruption actually succeeded. Once the contacts are apart and the arc has gone, the circuit voltage reappears across the gap, and the gap has to withstand it. The arc can re-establish if the recovering voltage exceeds the gap&#8217;s dielectric strength. Current may then continue until a later current-zero opportunity, with successful interruption still requiring sufficient dielectric recovery. That is why an interrupter is designed as a system: contact material and geometry, shield arrangement, and the travel and speed of the moving contact all aim at the same goal \u2014 reaching a current zero with a gap that can hold off the recovering voltage.<\/p>\n<p>One limit belongs with the explanation. A current zero is an opportunity, not a guarantee. The description above is the ordinary AC case. It does not promise that every fault, in every circuit and every configuration, is cleared at the first natural current zero, and on its own it says nothing about direct-current duties or about fault conditions outside the breaker&#8217;s assigned capability, whatever the interrupter&#8217;s internal design.<\/p>\n<figure class=\"wp-block-image size-full\" data-media-role=\"inline\"><img class=\"wp-image-1302\" src=\"https:\/\/liqele.com\/wp-content\/uploads\/2026\/10\/fig02-final-11.webp\" alt=\"The same vacuum contact pair shown closed, separated with a confined arc, and separated after the arc has extinguished\" width=\"1672\" height=\"941\" loading=\"lazy\" decoding=\"async\" srcset=\"https:\/\/liqele.com\/wp-content\/uploads\/2026\/10\/fig02-final-11.webp 1672w, https:\/\/liqele.com\/wp-content\/uploads\/2026\/10\/fig02-final-11-300x169.webp 300w, https:\/\/liqele.com\/wp-content\/uploads\/2026\/10\/fig02-final-11-1024x576.webp 1024w, https:\/\/liqele.com\/wp-content\/uploads\/2026\/10\/fig02-final-11-768x432.webp 768w, https:\/\/liqele.com\/wp-content\/uploads\/2026\/10\/fig02-final-11-1536x864.webp 1536w\" sizes=\"auto, (max-width: 1672px) 100vw, 1672px\" \/><figcaption>Mechanical separation can leave a metal-vapour arc carrying current. The recovered state illustrates successful arc extinction and contact-gap recovery in the ordinary AC case.<\/figcaption><\/figure>\n<h2>From Stored Energy and a Command to Contact Motion<\/h2>\n<p>The mechanism holds mechanical energy ready for contact movement. In a spring-operated mechanism of the kind described in both the indoor and the outdoor manuals used here, a charging motor charges the closing spring and holds that mechanical energy ready. Closing and opening are then separate releases: the close release lets the closing spring drive the moving contact towards the fixed contact, and the opening or trip release lets the opening spring drive it away again. A transmission shaft, linkage and the insulating rod carry the motion into the interrupter and into the moving stem, while a contact-pressure spring holds the contacts together with the force they need once they are closed.<\/p>\n<p>The main functions in that chain are distinct, and their division of labour is easy to lose sight of. The charging motor stores energy; it is not a protection device. The releases start motion in the correct direction. The linkage and insulating rod transmit motion. The bellows drives nothing and extinguishes nothing by itself; it only allows the moving stem to travel while the vacuum boundary remains sealed. The contacts carry current and make or break the circuit. Auxiliary contacts and status components report what the mechanism has done. Confusing any two of these leads directly to wrong expectations about what a breaker can be asked to do.<\/p>\n<p>The command that reaches the release can come from two quite different places, and the difference matters even though the mechanical result is identical. One is an intended switching operation: a deliberate control command, local or remote, to open or close the circuit for operational reasons. The other is a protective trip: measurement is taken from the primary circuit, a relay or controller evaluates it against its configured settings, and the resulting trip command releases the same mechanism. The measurement and the decision belong to the protection equipment and its configuration; the mechanism and contact system execute; the interrupter performs the interruption to its rated duty. A breaker does not detect faults by itself, and a protection scheme does not interrupt current by itself. Where the residual question is how those two sides are coordinated across a feeder, the <a href=\"https:\/\/liqele.com\/medium-voltage-feeder-switching-protection\/\">feeder switching and protection article<\/a> takes it further.<\/p>\n<p>This is also the point at which optional functions must not be assumed. Whether an outdoor breaker recloses automatically, communicates with a control centre, or offers a particular protection function depends on the controller and configuration actually selected, not on the fact that the device is a vacuum circuit breaker. The manual for the ZW32-12 outdoor model used here treats protection, reclosing and communication as capabilities of the chosen intelligent controller, and lists an integral isolating function under a specific variant designation rather than as a universal feature. Those belong to the configuration, not to the interruption principle.<\/p>\n<figure class=\"wp-block-image size-full\" data-media-role=\"inline\"><img class=\"wp-image-1303\" src=\"https:\/\/liqele.com\/wp-content\/uploads\/2026\/10\/fig03-final-11.webp\" alt=\"A simplified spring and latch module connected to an insulating output rod, labelled Store, Release and Move\" width=\"1672\" height=\"941\" loading=\"lazy\" decoding=\"async\" srcset=\"https:\/\/liqele.com\/wp-content\/uploads\/2026\/10\/fig03-final-11.webp 1672w, https:\/\/liqele.com\/wp-content\/uploads\/2026\/10\/fig03-final-11-300x169.webp 300w, https:\/\/liqele.com\/wp-content\/uploads\/2026\/10\/fig03-final-11-1024x576.webp 1024w, https:\/\/liqele.com\/wp-content\/uploads\/2026\/10\/fig03-final-11-768x432.webp 768w, https:\/\/liqele.com\/wp-content\/uploads\/2026\/10\/fig03-final-11-1536x864.webp 1536w\" sizes=\"auto, (max-width: 1672px) 100vw, 1672px\" \/><figcaption>In this simplified mechanical example, a latch retains spring energy until release, and a linkage transmits the resulting movement to an insulating output. It shows the division of mechanical jobs rather than a specific breaker mechanism.<\/figcaption><\/figure>\n<h2>Indoor Panels and Outdoor Feeders Use the Same Principle Differently<\/h2>\n<p>Indoor and outdoor vacuum circuit breakers interrupt current in the same way and differ in almost everything around that core.<\/p>\n<p>An indoor breaker is part of a panel. In the VS1-12 example, the mechanism and the breaker body form one unit that can be installed fixed, or fitted with a dedicated propelling mechanism to become a withdrawable handcart unit. Its primary terminals are arranged to connect at a defined position inside the cubicle, and its secondary circuits connect the control, indication and interlocking signals to the panel. The panel therefore fixes the constraints that decide whether a given breaker fits: cubicle dimensions, the primary contact arrangement at the service position, the secondary connector, the interlocking logic, and the control supply available.<\/p>\n<p>An outdoor breaker is part of a feeder structure rather than a cubicle. In the ZW32-12 outdoor example, the manual divides the primary equipment into the arc-quenching interrupters, the operating mechanism, and a mechanism box that also serves as the mounting, fixing and handling base; a pole-mounted seating arrangement is described separately, together with the primary connections and the external insulation of the poles. Because current transformers may be built into the package and the controller is a configurable item, sensing and control are part of what has to be specified rather than an afterthought.<\/p>\n<p>Sealing the interruption chamber does not seal the equipment. The interior of the interrupter is one environment and the installation is another; humidity, dust, temperature, pollution and the mechanical conditions of the site still act on the poles, the mechanism, the enclosure and the auxiliary equipment. A sealed interrupter is a reason the interruption medium is stable, not a reason the whole device is indifferent to where it is installed.<\/p>\n<p>A short scenario shows how much of a choice these surroundings decide. Imagine a project that must replace breakers inside existing indoor panels. The primary duties are known from the circuits, so candidates must first meet the required carrying, making, breaking and withstand duties. Among those suitable candidates, fit and interface narrow the choice: whether the chassis and pole spacing suit the existing cubicle, whether the primary contacts align at the service position, whether the secondary plug matches the panel wiring, whether the interlocks are of the same kind, and whether the mechanism suits the control supply and operating philosophy of the station. A breaker that looks stronger in the abstract loses to a plainer one that fits, because the shared interruption technology was never the discriminating factor.<\/p>\n<p>Now take the same project type outdoors, on a new overhead feeder. There is no cubicle to define the answer, so someone must decide how the breaker will be carried on the structure and how it will be operated from below; how much external insulation the site conditions call for, given exposure and pollution; whether current measurement comes from built-in transformers or separate sensors; whether a controller package with protection, and possibly reclosing and communication, is wanted or a simpler arrangement will do; and whether a visible isolating gap is required within the installable unit, which is a variant choice rather than a property of vacuum breakers as a class. The interruption principle is identical to the indoor case, and yet the candidate list is almost entirely different \u2014 because the constraints were never about vacuum in the first place.<\/p>\n<figure class=\"wp-block-image size-full\" data-media-role=\"inline\"><img class=\"wp-image-1304\" src=\"https:\/\/liqele.com\/wp-content\/uploads\/2026\/10\/fig04-final-11.webp\" alt=\"Reference-based indoor VS1 and outdoor ZW32 breaker portraits beside switchgear-room and open-air feeder surroundings\" width=\"1672\" height=\"941\" loading=\"lazy\" decoding=\"async\" srcset=\"https:\/\/liqele.com\/wp-content\/uploads\/2026\/10\/fig04-final-11.webp 1672w, https:\/\/liqele.com\/wp-content\/uploads\/2026\/10\/fig04-final-11-300x169.webp 300w, https:\/\/liqele.com\/wp-content\/uploads\/2026\/10\/fig04-final-11-1024x576.webp 1024w, https:\/\/liqele.com\/wp-content\/uploads\/2026\/10\/fig04-final-11-768x432.webp 768w, https:\/\/liqele.com\/wp-content\/uploads\/2026\/10\/fig04-final-11-1536x864.webp 1536w\" sizes=\"auto, (max-width: 1672px) 100vw, 1672px\" \/><figcaption>Indoor equipment interfaces with the panel; outdoor equipment must suit its support and exposure. The devices share a vacuum interruption principle while their surrounding installation requirements differ.<\/figcaption><\/figure>\n<h2>From Principle to the Required Arrangement<\/h2>\n<p>What follows from all of this is a practical sequence for anyone reading a breaker datasheet or manual. Start with the duty the breaker must perform: the continuous current it carries, the fault current and the conditions under which it must be broken, and the making and withstanding duties that go with them. Keep normal carrying and fault interruption as separate requirements rather than one combined headline. Then look at the installation the breaker must live in \u2014 cubicle and primary interfaces indoors, support, external insulation and exposure outdoors. Then look at the control arrangement: what issues commands, what measures current, what decides a trip, and which optional functions are genuinely part of the configuration.<\/p>\n<p>Those three sets of conditions have to work together. A good interrupter inside a mismatched installation is not a working solution, and neither is a perfectly fitted breaker wired to a control scheme that assumes functions it does not have. For the devices themselves, the current <a href=\"https:\/\/liqele.com\/products\/indoor-vacuum-circuit-breakers\/\">indoor vacuum circuit breaker family<\/a> and <a href=\"https:\/\/liqele.com\/products\/outdoor-vacuum-circuit-breakers\/\">outdoor vacuum circuit breaker family<\/a> are the place to start, with the <a href=\"https:\/\/liqele.com\/technical-support\/downloads\/\">product document library<\/a> used to find the matching manual and drawings for whichever model and configuration is being considered.<\/p>\n<p>If the remaining question is functional rather than mechanical \u2014 how circuit breaking differs from load switching, isolation or earthing in a medium-voltage installation \u2014 <a href=\"https:\/\/liqele.com\/medium-voltage-switching-devices-explained\/\">Medium-Voltage Switching Devices Explained<\/a> answers it directly. If the next step is a full project decision covering function, ratings, installation and control, <a href=\"https:\/\/liqele.com\/select-medium-voltage-switching-devices\/\">How to Select Medium-Voltage Switching Devices<\/a> continues from there.<\/p>\n<h2>FAQ<\/h2>\n<h3>Does a vacuum interrupter need to be pumped after each operation?<\/h3>\n<p>No. The interrupter remains sealed during normal switching. The arc forms in metal vapour from the contacts; after extinction, that vapour condenses inside the chamber. The moving stem travels through a bellows that maintains the sealed boundary, so a normal operation does not involve pumping the chamber down again.<\/p>\n<h3>Does a sealed vacuum interrupter make the whole breaker suitable for outdoor service?<\/h3>\n<p>No. The sealed chamber contains the interruption medium, while the poles, external insulation, mechanism enclosure, supports and auxiliary equipment face the installation environment. An outdoor arrangement still needs the external insulation, enclosure and mounting suited to its exposure and site conditions. The vacuum interruption principle alone does not establish those features.<\/p>\n<h3>Are two vacuum circuit breakers interchangeable when their rated voltages match?<\/h3>\n<p>Matching rated voltage does not establish interchangeability. The required carrying, making, breaking and withstand duties must also match, together with the installation interfaces. In an existing indoor panel, for example, primary contact positions, chassis dimensions, secondary connectors, interlocks and control supply can determine whether a breaker fits and operates as intended.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Comprender el funcionamiento del interruptor de vac\u00edo, desde sus componentes f\u00edsicos hasta la formaci\u00f3n de arcos en vapor met\u00e1lico, el punto de corriente cero AC, la recuperaci\u00f3n de la separaci\u00f3n entre contactos y su integraci\u00f3n pr\u00e1ctica en entornos interiores o exteriores.<\/p>","protected":false},"author":1,"featured_media":1300,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-1143","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technical-articles"],"_links":{"self":[{"href":"https:\/\/liqele.com\/es\/wp-json\/wp\/v2\/posts\/1143","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/liqele.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/liqele.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/liqele.com\/es\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/liqele.com\/es\/wp-json\/wp\/v2\/comments?post=1143"}],"version-history":[{"count":4,"href":"https:\/\/liqele.com\/es\/wp-json\/wp\/v2\/posts\/1143\/revisions"}],"predecessor-version":[{"id":1305,"href":"https:\/\/liqele.com\/es\/wp-json\/wp\/v2\/posts\/1143\/revisions\/1305"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/liqele.com\/es\/wp-json\/wp\/v2\/media\/1300"}],"wp:attachment":[{"href":"https:\/\/liqele.com\/es\/wp-json\/wp\/v2\/media?parent=1143"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/liqele.com\/es\/wp-json\/wp\/v2\/categories?post=1143"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/liqele.com\/es\/wp-json\/wp\/v2\/tags?post=1143"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}