{"product_id":"new-runda-rs4020b12h-ra-4020-dc12v-0-16a-4cm-3-wire-dual-ball-cooling-fan","title":"Runda Dual Ball Cooling Fan RS4020B12H-RA 4020 DC12V 0.16A 4CM 3-Wire","description":"\u003cstyle\u003e\n  \/* Koeed B2B Visual Identity *\/\n  .koeed-container {\n    line-height: 1.6;\n    color: #333;\n    width: 100%;\n  }\n  .koeed-title {\n    color: #0056b3;\n    border-left: 5px solid #16c8c8;\n    padding-left: 15px;\n    margin: 25px 0 15px;\n    font-size: 1.5rem;\n    font-weight: 700;\n  }\n  .koeed-subtitle {\n    color: #333;\n    font-size: 1.1rem;\n    margin-bottom: 10px;\n    font-weight: 600;\n  }\n  .koeed-highlight {\n    color: #16c8c8;\n    font-weight: bold;\n  }\n  .koeed-table-wrapper {\n    overflow-x: auto;\n    margin-bottom: 25px;\n  }\n  .koeed-table {\n    width: 100%;\n    border-collapse: collapse;\n    font-size: 0.95rem;\n  }\n  .koeed-table th {\n    background-color: #f4fcfc;\n    color: #0056b3;\n    text-align: left;\n    padding: 12px;\n    border: 1px solid #eeeeee;\n  }\n  .koeed-table td {\n    padding: 10px;\n    border: 1px solid #eeeeee;\n  }\n  .koeed-table tr:nth-child(even) { background-color: #fafafa; }\n  .koeed-table tr:nth-child(odd) { background-color: #f4fcfc; }\n\n  .koeed-tag {\n    display: inline-block;\n    background: #16c8c8;\n    color: #fff;\n    padding: 2px 8px;\n    border-radius: 4px;\n    font-size: 0.85rem;\n    margin-right: 5px;\n  }\n\n  \/* Interactive Tool Style *\/\n  .koeed-tool-box {\n    background: #ffffff;\n    border: 2px solid #16c8c8;\n    border-radius: 8px;\n    padding: 20px;\n    margin: 30px 0;\n  }\n  .koeed-input-group {\n    margin-bottom: 15px;\n  }\n  .koeed-input-group label {\n    display: block;\n    font-weight: bold;\n    margin-bottom: 5px;\n    font-size: 0.9rem;\n  }\n  .koeed-input-group input {\n    width: 100%;\n    padding: 10px;\n    border: 1px solid #ccc;\n    border-radius: 4px;\n    box-sizing: border-box;\n  }\n  .koeed-calc-btn {\n    background: #0056b3;\n    color: white;\n    border: none;\n    padding: 12px;\n    width: 100%;\n    border-radius: 4px;\n    cursor: pointer;\n    font-weight: bold;\n    transition: 0.3s;\n  }\n  .koeed-calc-btn:hover { background: #16c8c8; }\n  .koeed-result {\n    margin-top: 15px;\n    padding: 15px;\n    background: #f0fdfd;\n    border-radius: 4px;\n    display: none;\n    border-left: 4px solid #16c8c8;\n  }\n\u003c\/style\u003e\n\n\u003cdiv class=\"koeed-container\"\u003e\n  \u003c!-- SEO Introduction --\u003e\n  \u003cp\u003e\n    The \u003cstrong\u003eRunda RS4020B12H-RA\u003c\/strong\u003e is a high-performance 40mm \u003cstrong\u003eDC Axial Cooling Fan\u003c\/strong\u003e \n    designed for critical industrial cooling applications. Featuring a \u003cspan class=\"koeed-highlight\"\u003eDual Ball Bearing\u003c\/span\u003e \n    system, this 12V 0.16A fan provides exceptional longevity and reliability in 24\/7 operating environments. \n    Its compact 40x40x20mm form factor makes it ideal for 1U server chassis, industrial power supplies, \n    and high-density network switches requiring high static pressure.\n  \u003c\/p\u003e\n  \u003cdiv style=\"margin-bottom: 20px;\"\u003e\n    \u003cspan class=\"koeed-tag\"\u003eDual Ball Bearing\u003c\/span\u003e\n    \u003cspan class=\"koeed-tag\"\u003eHigh Static Pressure\u003c\/span\u003e\n    \u003cspan class=\"koeed-tag\"\u003e12V DC Fan\u003c\/span\u003e\n    \u003cspan class=\"koeed-tag\"\u003eIndustrial Cooling\u003c\/span\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Technical Specifications --\u003e\n  \u003ch2 class=\"koeed-title\"\u003eTechnical Specifications\u003c\/h2\u003e\n  \u003cdiv class=\"koeed-table-wrapper\"\u003e\n    \u003ctable class=\"koeed-table\"\u003e\n      \u003cthead\u003e\n        \u003ctr\u003e\n          \u003cth\u003eElectrical \u0026amp; Mechanical Parameters\u003c\/th\u003e\n          \u003cth\u003eStandard Values\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003cstrong\u003eModel Number\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd\u003eRS4020B12H-RA\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd\u003e40 x 40 x 20 mm (4CM)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003cstrong\u003eRated Voltage\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd\u003e12V DC\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003cstrong\u003eRated Current\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd\u003e0.16 A\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003cstrong\u003eBearing Type\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd\u003ePrecision Dual Ball Bearing\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003cstrong\u003eWiring Configuration\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd\u003e3-Wire (Red\/Black\/Yellow for Speed Sensing\/FG)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd\u003e-10°C to +70°C\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003cstrong\u003eLife Expectancy (MTTF)\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd\u003eApprox. 70,000 Hours @ 40°C\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Application \u0026 Reliability --\u003e\n  \u003ch2 class=\"koeed-title\"\u003eIndustrial Reliability \u0026amp; Application\u003c\/h2\u003e\n  \u003cp\u003e\n    The \u003cstrong\u003eDual Ball Bearing\u003c\/strong\u003e technology in the Runda RS4020B12H-RA is superior to standard \n    sleeve bearings, offering significantly lower friction and higher resistance to heat. This allows \n    the fan to be mounted in any orientation without compromising its service life.\n  \u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePrecision Cooling:\u003c\/strong\u003e Ideal for VRM and chipset cooling on industrial motherboards.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eLong-Life Operation:\u003c\/strong\u003e Perfect for sealed enclosures where maintenance access is limited.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSpeed Monitoring:\u003c\/strong\u003e The 3rd wire provides a Frequency Generator (FG) signal to the system controller for real-time RPM monitoring and failure detection.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003c!-- Interactive Tool: Fan Sizing Calculator --\u003e\n  \u003cdiv class=\"koeed-tool-box\"\u003e\n    \u003ch3 class=\"koeed-subtitle\" style=\"color: #0056b3; margin-top: 0;\"\u003eThermal Management \u0026amp; Fan Sizing Calculator\u003c\/h3\u003e\n    \u003cp style=\"font-size: 0.85rem; margin-bottom: 15px;\"\u003e\n      Determine the required airflow (CFM) for your enclosure to ensure the Runda RS4020B12H-RA meets your thermal requirements.\n    \u003c\/p\u003e\n    \n    \u003cdiv class=\"koeed-input-group\"\u003e\n      \u003clabel for=\"koeed-watts\"\u003eTotal Heat Dissipation (Watts):\u003c\/label\u003e\n      \u003cinput type=\"number\" id=\"koeed-watts\" placeholder=\"e.g. 15\" step=\"0.1\"\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"koeed-input-group\"\u003e\n      \u003clabel for=\"koeed-delta-t\"\u003eAllowed Temperature Rise (ΔT in °C):\u003c\/label\u003e\n      \u003cinput type=\"number\" id=\"koeed-delta-t\" placeholder=\"e.g. 10\" step=\"1\"\u003e\n    \u003c\/div\u003e\n\n    \u003cbutton class=\"koeed-calc-btn\" onclick=\"koeedCalculateAirflow()\"\u003eCalculate Required CFM\u003c\/button\u003e\n    \n    \u003cdiv id=\"koeed-res\" class=\"koeed-result\"\u003e\u003c\/div\u003e\n    \n    \u003cnoscript\u003e\n      \u003cp\u003eTool Logic: Required CFM = (3.16 * Watts) \/ ΔT (°C). This formula helps engineers determine the volumetric airflow needed to maintain a safe operating temperature within a chassis.\u003c\/p\u003e\n    \u003c\/noscript\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Troubleshooting FAQ --\u003e\n  \u003ch2 class=\"koeed-title\"\u003eTroubleshooting FAQ\u003c\/h2\u003e\n  \u003cdiv class=\"koeed-table-wrapper\"\u003e\n    \u003ctable class=\"koeed-table\"\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"width: 30%;\"\u003e\u003cstrong\u003eFan does not rotate?\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003eCheck DC voltage polarity (Red: +, Black: -). Ensure the connector is securely seated and the 12V supply can provide at least 0.2A peak current.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eExcessive Noise?\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003eVerify there is no physical obstruction (cables, zip ties) hitting the blades. Dual ball bearings may have a slight initial hum which stabilizes after the run-in period.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eRPM Reading Error?\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003eEnsure the Yellow (FG) wire is connected to a compatible tachometer input. For some PLC\/Microcontrollers, a pull-up resistor may be required to read the signal correctly.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cscript\u003e\nfunction koeedCalculateAirflow() {\n  const watts = parseFloat(document.getElementById('koeed-watts').value);\n  const dt = parseFloat(document.getElementById('koeed-delta-t').value);\n  const resultDiv = document.getElementById('koeed-res');\n\n  if (isNaN(watts) || isNaN(dt) || dt \u003c= 0) {\n    alert(\"Please enter valid positive values.\");\n    return;\n  }\n\n  \/\/ Formula: CFM = (3.16 * Watts) \/ Delta_T_Celsius\n  const requiredCFM = (3.16 * watts \/ dt).toFixed(2);\n\n  resultDiv.style.display = 'block';\n  resultDiv.innerHTML = `\n    \u003cstrong\u003eEstimated Requirement:\u003c\/strong\u003e ${requiredCFM} CFM \u003cbr\u003e\n    \u003csmall style=\"font-weight:normal; color:#666;\"\u003eNote: It is recommended to select a fan with at least 20-30% higher CFM than calculated to account for internal static pressure (system impedance).\u003c\/small\u003e\n  `;\n}\n\u003c\/script\u003e\n\n\u003c!-- Structured Data --\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"WebApplication\",\n  \"name\": \"System Thermal Management \u0026 Fan Sizing Calculator\",\n  \"operatingSystem\": \"All\",\n  \"applicationCategory\": \"EngineeringTool\",\n  \"description\": \"A tool to calculate the required airflow (CFM) for electronic enclosures based on power dissipation and temperature rise.\"\n}\n\u003c\/script\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [{\n    \"@type\": \"Question\",\n    \"name\": \"How to wire the 3-wire Runda RS4020B12H-RA fan?\",\n    \"acceptedAnswer\": {\n      \"@type\": \"Answer\",\n      \"text\": \"Standard wiring: Red wire is DC Positive (+12V), Black wire is DC Negative (GND), and Yellow wire is the FG (Frequency Generator) output for speed monitoring.\"\n    }\n  }, {\n    \"@type\": \"Question\",\n    \"name\": \"What are the benefits of dual ball bearings in cooling fans?\",\n    \"acceptedAnswer\": {\n      \"@type\": \"Answer\",\n      \"text\": \"Dual ball bearings offer a longer lifespan (MTTF), better tolerance for high-temperature environments, and the ability to operate in any mounting orientation compared to sleeve bearings.\"\n    }\n  }]\n}\n\u003c\/script\u003e","brand":"RUNDA","offers":[{"title":"Default Title","offer_id":44424497496249,"sku":"156238720087","price":28.36,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0268\/8476\/7929\/files\/s-l1600_0575a1da-f889-4f9b-9401-abf06d60b983.jpg?v=1724162577","url":"https:\/\/koeed.com\/de\/products\/new-runda-rs4020b12h-ra-4020-dc12v-0-16a-4cm-3-wire-dual-ball-cooling-fan","provider":"KOEED","version":"1.0","type":"link"}