{"id":2837,"date":"2026-05-11T01:00:00","date_gmt":"2026-05-11T01:00:00","guid":{"rendered":"https:\/\/shieldhz.com\/?p=2837"},"modified":"2026-05-12T08:29:30","modified_gmt":"2026-05-12T08:29:30","slug":"rotary-cam-switch-functions","status":"publish","type":"post","link":"https:\/\/shieldhz.com\/ar\/rotary-cam-switch-functions\/","title":{"rendered":"\u0648\u0638\u0627\u0626\u0641 \u0645\u0641\u062a\u0627\u062d \u0627\u0644\u0643\u0627\u0645\u064a\u0631\u0627 \u0627\u0644\u062f\u0648\u0627\u0631\u0629: \u0645\u0633\u0627\u0631\u0627\u062a \u0627\u0644\u062a\u0634\u063a\u064a\u0644 \u0648\u0627\u0644\u0625\u064a\u0642\u0627\u0641\u060c \u0648\u0627\u0644\u062a\u0628\u062f\u064a\u0644\u060c \u0648\u0645\u0642\u064a\u0627\u0633 \u0627\u0644\u0641\u0648\u0644\u062a\u0645\u064a\u062a\u0631\u060c \u0648\u0627\u0644\u0623\u0645\u064a\u062a\u0631"},"content":{"rendered":"<p>Rotary cam switches share a common mechanical form but serve four distinct electrical functions. Specifying the wrong function code for a given circuit is not a minor error. In a current transformer circuit, it can generate dangerous overvoltage. In a source changeover application, it can momentarily parallel two supplies. Understanding what separates ON-OFF, changeover, voltmeter selector, and ammeter selector functions &#8211; and how to verify the right one before ordering &#8211; is the core purpose of this article.<\/p>\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/shieldhz.com\/wp-content\/uploads\/2026\/05\/rotary-cam-switch-function-types.webp\" alt=\"Rotary cam switch function types for isolation transfer voltage selection and current selection\" loading=\"lazy\" \/><figcaption>Figure 1. The four common function groups route circuits differently: ON-OFF, changeover, voltmeter selector, and ammeter selector.<\/figcaption><\/figure>\n<h2>What Rotary Cam Switch Functions Mean<\/h2>\n<p>A rotary cam switch is a multi-position, multi-pole switching device. Turning the handle rotates a shaft. That shaft carries a stack of cam discs, each of which opens or closes a specific contact pair at a specific angular position. The combination of disc profiles across all poles defines the switch&#8217;s function.<\/p>\n<p>The word &#8220;function&#8221; in this context means the complete switching route the device performs across all positions and all poles. Two switches that look identical on the outside &#8211; same frame size, same terminal count, same current rating &#8211; can have entirely different internal cam programs and therefore perform entirely different electrical functions.<\/p>\n<p>This distinction matters because:<\/p>\n<ul>\n<li>A voltmeter selector routes voltage signals. Its contacts can open before the next position closes without any hazard.<\/li>\n<li>An ammeter selector routes current transformer secondaries. Its contacts must never open without first providing a shorting path for the CT secondary. An open CT secondary under load can produce voltages high enough to damage insulation and injure personnel.<\/li>\n<li>A changeover switch transfers between two sources. Its cam profile must ensure the outgoing source is disconnected before the incoming source connects, preventing even a brief parallel condition.<\/li>\n<li>An ON-OFF switch simply isolates. All poles open together at the OFF position.<\/li>\n<\/ul>\n<p>None of these functions is interchangeable. The cam disc program is the specification, not the frame size or the terminal layout.<\/p>\n<h2>How Cam Discs Create Contact Sequences<\/h2>\n<p>Each cam disc is a shaped lobe mounted on the central shaft. As the shaft rotates, the lobe either lifts a contact bridge away from its fixed contacts (opening the circuit) or allows a spring to push the bridge into contact (closing the circuit). The angular width of the lobe determines how many degrees of rotation the contact stays open or closed.<\/p>\n<p>A single switch position corresponds to a defined angular increment &#8211; commonly 30, 45, or 60 degrees depending on the design. At each position, every cam disc in the stack is either holding its contact open or allowing it to close. The full set of open\/closed states across all poles at all positions is the contact sequence, sometimes called the contact truth table.<\/p>\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/shieldhz.com\/wp-content\/uploads\/2026\/05\/cam-disc-contact-sequence-mechanism.webp\" alt=\"Cam disc contact sequence mechanism showing shaft lobes contact bridge and switching route\" loading=\"lazy\" \/><figcaption>Figure 2. Cam disc geometry determines which contact bridge opens or closes at each handle position.<\/figcaption><\/figure>\n<p>Two terms describe the relationship between adjacent positions:<\/p>\n<ul>\n<li>Break-before-make (BBM): the outgoing contact opens before the incoming contact closes. There is a brief interval where neither contact is closed.<\/li>\n<li>Make-before-break (MBM): the incoming contact closes before the outgoing contact opens. Both contacts are briefly closed simultaneously.<\/li>\n<\/ul>\n<p>For voltage measurement circuits, BBM is standard and safe. For CT secondary circuits, MBM is required. The cam disc geometry &#8211; specifically the angular overlap between the lobe edges of adjacent discs &#8211; is what determines which behavior occurs.<\/p>\n<p>This is why the contact sequence diagram is the critical document when specifying or replacing a rotary cam switch. The wiring diagram shows where the wires go. The contact sequence diagram shows what actually happens electrically at each angular step. Both documents are needed, but the sequence diagram is the one that determines safety in CT circuits.<\/p>\n<p>Cam discs are typically stacked in groups corresponding to poles. A three-phase, four-pole switch will have four disc positions per layer. Custom cam programs are available from manufacturers for non-standard switching routes, but standard function codes cover the most common applications.<\/p>\n<h2>ON-OFF Function<\/h2>\n<p>The ON-OFF function is the simplest cam program. In the OFF position, all poles are open simultaneously. In the ON position, all poles are closed simultaneously. There are no intermediate positions.<\/p>\n<p>This function is used for:<\/p>\n<ul>\n<li>Isolating a panel section for maintenance<\/li>\n<li>Switching a single load on and off under operator control<\/li>\n<li>Providing a visible break point in a distribution circuit<\/li>\n<\/ul>\n<p>The cam profile for an ON-OFF switch is symmetrical. All lobes are aligned so that every contact opens and closes at the same angular position. The transition is simultaneous across all poles, which is the correct behavior for isolation duty.<\/p>\n<p>For motor control applications, the SH30 series from Shieldhz covers 20A to 125A in AC-23A duty rating, which is the IEC category for switching motor loads. AC-23A duty accounts for the higher inrush and breaking currents associated with inductive motor loads, which are more demanding than resistive load switching. The SH30 also offers door-interlock options, which are relevant for panels where the switch must be in the OFF position before the enclosure door can be opened.<\/p>\n<p>When specifying an ON-OFF switch, the key datasheet checks are:<\/p>\n<ul>\n<li>Rated operational current at the relevant AC utilization category (AC-21A for resistive, AC-22A for mixed, AC-23A for motor loads)<\/li>\n<li>Number of poles required<\/li>\n<li>Whether simultaneous operation across all poles is confirmed in the contact sequence diagram<\/li>\n<li>Mechanical endurance rating (number of operating cycles)<\/li>\n<\/ul>\n<h2>Changeover Function<\/h2>\n<p>A changeover switch transfers a load between two sources. The standard cam program for this function uses a break-before-make sequence: the connection to source 1 is fully broken before the connection to source 2 is established. This prevents even a momentary parallel condition between the two sources.<\/p>\n<p>Typical positions for a three-position changeover switch are:<\/p>\n<ul>\n<li>Position 1: Source A connected, Source B open<\/li>\n<li>Position 0 (center): Both sources open<\/li>\n<li>Position 2: Source A open, Source B connected<\/li>\n<\/ul>\n<p>The center OFF position is not always present. Some changeover switches are designed for direct transfer without a neutral position. Whether a neutral position is required depends on the application &#8211; generator-to-mains transfer, for example, typically requires a neutral position to allow the generator to stabilize before connecting to the load.<\/p>\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/shieldhz.com\/wp-content\/uploads\/2026\/05\/changeover-cam-switch-break-before-make-route.webp\" alt=\"Changeover cam switch break-before-make route for source transfer applications\" loading=\"lazy\" \/><figcaption>Figure 3. A changeover cam switch should disconnect the outgoing source before connecting the incoming source unless a different sequence is explicitly specified.<\/figcaption><\/figure>\n<p>The LW42 series covers compact changeover applications at 20A, 25A, and 32A. It is suited to universal changeover applications where panel space is limited and the current requirement falls within that range. For higher current changeover duties &#8211; motor control, source transfer in larger distribution panels &#8211; the LW28 series covers 10A to 315A with custom cam programs available for non-standard transfer sequences.<\/p>\n<p>Datasheet checks for changeover function:<\/p>\n<ul>\n<li>Confirm the contact sequence diagram shows a genuine break-before-make transition at every source transfer step<\/li>\n<li>Verify the rated current matches the load, not just the cable rating<\/li>\n<li>Check whether a neutral (center-off) position is present and required by the application<\/li>\n<li>Confirm the number of poles covers all switched conductors &#8211; in a three-phase system, this typically means three or four poles depending on whether neutral is switched<\/li>\n<\/ul>\n<h2>Voltmeter Selector Function<\/h2>\n<p>A voltmeter selector routes a panel voltmeter to different measurement points across a three-phase system. The standard seven-position program covers:<\/p>\n<ul>\n<li>Position 0: Off (voltmeter isolated)<\/li>\n<li>Position 1: L1 to L2<\/li>\n<li>Position 2: L2 to L3<\/li>\n<li>Position 3: L3 to L1<\/li>\n<li>Position 4: L1 to N<\/li>\n<li>Position 5: L2 to N<\/li>\n<li>Position 6: L3 to N<\/li>\n<\/ul>\n<p>This gives a complete set of phase-to-phase and phase-to-neutral measurements from a single instrument using a single switch.<\/p>\n<p>The cam profile for a voltmeter selector uses break-before-make transitions. This is safe for voltage measurement because the voltmeter input impedance is high. Opening one measurement connection before closing the next does not create a hazard &#8211; the voltmeter simply reads nothing during the brief transition.<\/p>\n<p>The contact current in a voltmeter selector circuit is very low &#8211; typically milliamps through the voltmeter input. This means the contact rating for switching duty is not the primary concern. What matters more is:<\/p>\n<ul>\n<li>The number of positions and whether the cam program matches the measurement points required<\/li>\n<li>The insulation voltage rating, which must be adequate for the system voltage being measured<\/li>\n<li>Whether the OFF position fully isolates the voltmeter from all phases<\/li>\n<\/ul>\n<p>A reduced position program &#8211; for example, phase-to-phase only without phase-to-neutral &#8211; is available as an alternative function code. Always verify the contact sequence diagram matches the measurement points required for the specific panel design.<\/p>\n<h2>Ammeter Selector Function<\/h2>\n<p>The ammeter selector function is the most safety-critical of the four. It routes a panel ammeter to current transformer secondaries on each phase of a three-phase system. The standard positions are:<\/p>\n<ul>\n<li>Position 0: Off (ammeter shorted or isolated, depending on design)<\/li>\n<li>Position 1: Phase L1 CT secondary connected to ammeter<\/li>\n<li>Position 2: Phase L2 CT secondary connected to ammeter<\/li>\n<li>Position 3: Phase L3 CT secondary connected to ammeter<\/li>\n<\/ul>\n<p>The critical requirement is that the CT secondary circuit must never be open-circuited while the primary conductor is carrying current. A CT secondary that is open under load will develop a voltage determined by the turns ratio and the primary current. In practical distribution circuits, this can reach several hundred volts or more across a secondary rated for much lower voltage. This is a genuine hazard to both equipment and personnel.<\/p>\n<p>To prevent this, an ammeter selector switch designed for CT service must use a make-before-break contact sequence at every transition. The incoming CT secondary connection must be established before the outgoing connection is broken. This ensures the CT secondary always has a low-impedance burden path, even during the transition between positions.<\/p>\n<p>Some designs achieve this with dedicated shorting contacts that bridge the CT secondary terminals during rotation. Others use overlapping cam lobes that create a brief parallel connection between adjacent positions. Either approach is acceptable provided the contact sequence diagram confirms that no open-circuit condition exists at any angular position during rotation.<\/p>\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/shieldhz.com\/wp-content\/uploads\/2026\/05\/ammeter-selector-ct-shorting-contact-route.webp\" alt=\"Ammeter selector switch CT shorting contact route with make-before-break cam sequence\" loading=\"lazy\" \/><figcaption>Figure 4. Ammeter selector service needs a cam sequence that keeps CT secondary circuits burdened or shorted during handle transitions.<\/figcaption><\/figure>\n<p>This is the point where a generic rotary cam switch is not automatically suitable for ammeter selector duty. A standard cam switch with a break-before-make profile will open the CT secondary during every position change. That is not acceptable in a live CT circuit. The switch must be specifically designed and documented for ammeter selector service, with a contact sequence that maintains CT secondary burden throughout rotation.<\/p>\n<p>When specifying an ammeter selector switch:<\/p>\n<ul>\n<li>Obtain the contact sequence diagram and confirm MBM behavior at every transition<\/li>\n<li>Verify the switch is rated for the CT secondary burden in the circuit<\/li>\n<li>Check whether the OFF position shorts the CT secondary or leaves it open &#8211; shorting is the safer default<\/li>\n<li>Confirm the function code with the manufacturer, not just the wiring diagram<\/li>\n<\/ul>\n<p>The LW28 series supports custom cam programs including ammeter selector configurations. Confirm the specific function code and request the contact sequence diagram before ordering.<\/p>\n<p>IEC 60947-3:2020+AMD1:2025, available at the IEC webstore and covering switches, disconnectors, switch-disconnectors, and fuse-combination units for distribution and motor circuits up to 1000 V AC or 1500 V DC, is the relevant product standard for the switch itself. CT instrument transformer requirements fall under a separate standard. Both apply when commissioning a metering panel, and local electrical codes may impose additional requirements on CT circuit protection and panel labeling.<\/p>\n<h2>How to Select the Right Function Code<\/h2>\n<p>Function codes are manufacturer-specific. A code from one manufacturer does not guarantee an identical contact sequence from another. This is a common source of errors when replacing a switch or sourcing an equivalent from a different supplier.<\/p>\n<p>The correct selection process:<\/p>\n<ol>\n<li>Define the switching route required &#8211; ON-OFF, changeover, voltmeter selector, or ammeter selector.<\/li>\n<li>Determine the number of poles, positions, and current rating.<\/li>\n<li>Obtain the contact sequence diagram for the candidate switch, not just the wiring diagram.<\/li>\n<li>Verify the sequence diagram matches the required switching behavior, including BBM or MBM at each transition.<\/li>\n<li>Cross-reference the function code with the manufacturer&#8217;s cam program table to confirm the diagram corresponds to the ordered code.<\/li>\n<li>For ammeter selector duty, confirm CT shorting behavior explicitly with the manufacturer.<\/li>\n<\/ol>\n<p>For the Shieldhz LW28 series, function codes cover standard programs for motor control, source changeover, panel metering, and custom cam configurations. The LW42 series covers compact changeover and measurement applications. Both series have contact sequence diagrams available &#8211; request them before finalizing a specification.<\/p>\n<p>A practical checklist for panel engineers:<\/p>\n<ul>\n<li>Current rating matches load at the correct AC utilization category<\/li>\n<li>Number of poles covers all switched conductors<\/li>\n<li>Contact sequence diagram obtained and reviewed<\/li>\n<li>Function code confirmed with manufacturer<\/li>\n<li>BBM or MBM behavior verified for the specific application<\/li>\n<li>Local panel safety review completed, including CT circuit protection if applicable<\/li>\n<li>Mechanical endurance rating adequate for expected operating cycles<\/li>\n<\/ul>\n<h2>Troubleshooting by Function Type<\/h2>\n<p>Faults in rotary cam switch circuits tend to follow patterns that correspond to the function type.<\/p>\n<p>ON-OFF switches: The most common fault is contact wear causing high resistance in the closed position. This shows up as voltage drop across the switch under load. Check the contact resistance against the manufacturer&#8217;s datasheet limit. Pitting or carbonization on contact faces indicates the switch has been operated under load conditions beyond its rated category. If the switch is rated AC-21A but has been switching motor loads, replace it with an AC-23A rated device.<\/p>\n<p>Changeover switches: Unexpected parallel conditions between sources suggest the cam profile has worn or the detent mechanism is not holding positions cleanly. If the switch can be rested between positions, both sources may be briefly connected. Check the detent spring and position stops. Also verify that the contact sequence diagram was correct for the application &#8211; some changeover programs do not include a neutral position, and if one is required, the wrong function code was specified.<\/p>\n<p>Voltmeter selectors: Incorrect readings at specific positions usually indicate a failed contact in that position. Use the contact sequence diagram to identify which contact pair corresponds to the faulty reading, then inspect that contact. Intermittent readings during rotation suggest worn cam lobes that are not holding the contact fully closed at the target position.<\/p>\n<p>Ammeter selectors: Any unexplained ammeter deflection to full scale during position changes, or evidence of insulation damage near CT secondary terminals, suggests the switch is not maintaining CT secondary burden during rotation. This is a serious fault. Take the circuit out of service, verify the contact sequence diagram, and confirm whether the installed switch is actually rated for ammeter selector duty. Do not assume a switch labeled &#8220;ammeter selector&#8221; has the correct cam profile without checking the sequence diagram.<\/p>\n<p>General: If a replacement switch has been installed and the circuit behavior has changed, the most likely cause is a function code mismatch. The replacement may have the correct frame size and current rating but a different cam program. Always compare contact sequence diagrams between the original and replacement before commissioning.<\/p>\n<h2>Shieldhz Product Context and Buying Checklist<\/h2>\n<p>Shieldhz manufactures rotary cam switches across three main series relevant to the functions covered in this article.<\/p>\n<p>The LW28 series covers 10A to 315A and supports motor control, source changeover, panel metering, and custom cam programs. It is the appropriate choice when current requirements exceed the compact range or when a non-standard cam program is needed. The <a href=\"https:\/\/shieldhz.com\/ar\/rotary-cam-switches\/lw28-rotary-cam-switches\/\">LW28 rotary cam switch page<\/a> lists available configurations.<\/p>\n<p>The LW42 series covers 20A, 25A, and 32A in a compact form factor suited to universal changeover and measurement applications. Details are available on the <a href=\"https:\/\/shieldhz.com\/ar\/rotary-cam-switches\/lw42-rotary-cam-switches\/\">LW42 rotary cam switch page<\/a>.<\/p>\n<p>The SH30 series covers 20A to 125A as a load isolator with AC-23A duty rating, door-interlock options, and suitability for HVAC, ventilation, and water pump applications. See the <a href=\"https:\/\/shieldhz.com\/ar\/rotary-cam-switches\/sh30-rotary-cam-switches\/\">SH30 load isolator switch page<\/a>.<\/p>\n<p>The full <a href=\"https:\/\/shieldhz.com\/ar\/rotary-cam-switches\/\">rotary cam switch range<\/a> is also available for comparison.<\/p>\n<p>Buying checklist before ordering:<\/p>\n<ul>\n<li>Function type confirmed: ON-OFF, changeover, voltmeter selector, or ammeter selector<\/li>\n<li>Current rating and AC utilization category verified against load<\/li>\n<li>Number of poles and positions confirmed<\/li>\n<li>Contact sequence diagram requested and reviewed<\/li>\n<li>For ammeter selector: MBM behavior and CT shorting confirmed with manufacturer<\/li>\n<li>For changeover: BBM behavior and neutral position requirement confirmed<\/li>\n<li>Function code cross-referenced with manufacturer cam program table<\/li>\n<li>Local electrical code and panel safety review completed<\/li>\n<li>Mechanical endurance rating checked against expected cycle count<\/li>\n<\/ul>\n<p>For technical questions or custom cam program requirements, <a href=\"https:\/\/shieldhz.com\/ar\/contact\/\">\u062a\u0648\u0627\u0635\u0644 \u0645\u0639 \u0634\u064a\u0644\u062f\u0647\u0632<\/a>.<\/p>\n<h2>\u0627\u0644\u0623\u0633\u0626\u0644\u0629 \u0627\u0644\u0634\u0627\u0626\u0639\u0629<\/h2>\n<h3>What is the difference between a voltmeter selector and an ammeter selector switch?<\/h3>\n<p>A voltmeter selector routes voltage signals to a panel voltmeter using a break-before-make contact sequence. An ammeter selector routes current transformer secondaries to a panel ammeter and must use a make-before-break sequence to prevent the CT secondary from being open-circuited during rotation. The two functions require different cam profiles and are not interchangeable.<\/p>\n<h3>Can I use a standard rotary cam switch for ammeter selector duty?<\/h3>\n<p>Not automatically. A standard cam switch with a break-before-make profile will open the CT secondary during position changes, which is a hazard in a live CT circuit. Ammeter selector service requires a switch with a contact sequence specifically designed to maintain CT secondary burden throughout rotation. Confirm the contact sequence diagram with the manufacturer before specifying.<\/p>\n<h3>What does IEC 60947-3 cover for rotary cam switches?<\/h3>\n<p>IEC 60947-3:2020+AMD1:2025 covers switches, disconnectors, switch-disconnectors, and fuse-combination units for distribution and motor circuits up to 1000 V AC or 1500 V DC. It sets requirements for rated currents, utilization categories, mechanical and electrical endurance, and dielectric properties. The standard is available through the <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/107159\" target=\"_blank\" rel=\"noopener\">\u0645\u062a\u062c\u0631 IEC \u0627\u0644\u0625\u0644\u0643\u062a\u0631\u0648\u0646\u064a<\/a>. CT instrument transformer requirements fall under a separate standard.<\/p>\n<h3>Are function codes standardized across manufacturers?<\/h3>\n<p>No. Function codes are manufacturer-specific. A code from one manufacturer does not guarantee an identical contact sequence from another. When replacing a switch or sourcing an equivalent from a different supplier, always compare the contact sequence diagrams directly rather than relying on matching function codes.<\/p>\n<h3>What is the risk of an open CT secondary?<\/h3>\n<p>A current transformer secondary that is open while the primary conductor carries current will develop a voltage determined by the turns ratio and the primary current. In distribution circuits, this can reach levels that damage insulation and create a shock hazard. This is why ammeter selector switches must maintain a low-impedance burden path across the CT secondary at every position during rotation.<\/p>\n<h3>What is the difference between break-before-make and make-before-break in cam switches?<\/h3>\n<p>Break-before-make means the outgoing contact opens before the incoming contact closes. There is a brief interval where neither contact is closed. This is standard for voltage measurement and changeover applications. Make-before-break means the incoming contact closes before the outgoing contact opens. Both contacts are briefly closed simultaneously. This is required for CT secondary circuits to prevent open-circuit conditions during rotation.<\/p>\n<h3>How do I verify the correct function code for a Shieldhz LW28 or LW42 switch?<\/h3>\n<p>Request the contact sequence diagram for the specific function code from Shieldhz. Cross-reference the diagram against the cam program table in the product documentation. For ammeter selector configurations, confirm MBM behavior and CT shorting contact behavior explicitly. For changeover configurations, confirm BBM behavior and whether a neutral position is included. <a href=\"https:\/\/shieldhz.com\/ar\/contact\/\">Contact Shieldhz directly<\/a> for custom cam program requirements.<\/p>","protected":false},"excerpt":{"rendered":"<p>\u062a\u0639\u0631\u0641 \u0639\u0644\u0649 \u0643\u064a\u0641\u064a\u0629 \u062a\u0648\u062c\u064a\u0647 \u0648\u0638\u0627\u0626\u0641 \u0645\u0641\u062a\u0627\u062d \u0627\u0644\u0643\u0627\u0645\u0629 \u0627\u0644\u062f\u0648\u0627\u0631\u0629 \u0644\u062f\u0648\u0627\u0626\u0631 \u0627\u0644\u062a\u0634\u063a\u064a\u0644 \u0648\u0627\u0644\u0625\u064a\u0642\u0627\u0641\u060c \u0648\u0627\u0644\u062a\u0628\u062f\u064a\u0644\u060c \u0648\u0627\u0644\u0641\u0648\u0644\u062a\u0645\u064a\u062a\u0631\u060c \u0648\u0627\u0644\u0623\u0645\u064a\u062a\u0631\u060c \u0648\u0645\u0627 \u064a\u062c\u0628 \u0639\u0644\u0649 \u0627\u0644\u0645\u0634\u062a\u0631\u064a\u0646 \u0627\u0644\u062a\u062d\u0642\u0642 \u0645\u0646\u0647 \u0642\u0628\u0644 \u0627\u0644\u0637\u0644\u0628.<\/p>","protected":false},"author":2,"featured_media":2832,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_gspb_post_css":"","footnotes":""},"categories":[44],"tags":[],"class_list":["post-2837","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-rotary-cam-switches"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/shieldhz.com\/ar\/wp-json\/wp\/v2\/posts\/2837","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/shieldhz.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/shieldhz.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/shieldhz.com\/ar\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/shieldhz.com\/ar\/wp-json\/wp\/v2\/comments?post=2837"}],"version-history":[{"count":2,"href":"https:\/\/shieldhz.com\/ar\/wp-json\/wp\/v2\/posts\/2837\/revisions"}],"predecessor-version":[{"id":2990,"href":"https:\/\/shieldhz.com\/ar\/wp-json\/wp\/v2\/posts\/2837\/revisions\/2990"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/shieldhz.com\/ar\/wp-json\/wp\/v2\/media\/2832"}],"wp:attachment":[{"href":"https:\/\/shieldhz.com\/ar\/wp-json\/wp\/v2\/media?parent=2837"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/shieldhz.com\/ar\/wp-json\/wp\/v2\/categories?post=2837"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/shieldhz.com\/ar\/wp-json\/wp\/v2\/tags?post=2837"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}