{"product_id":"new-1-pcs-xfan-fan-12cm-2-wire-cooling-fan-rdm1238b-dc12v-0-40a-12038","title":"new 1pcs XFAN Fan 12CM 2 wire cooling fan RDM1238B DC12V 0.40A 12038","description":"\u003cdiv class=\"koeed-container\"\u003e\n    \u003ch2\u003eEngineer's Quick Brief\u003c\/h2\u003e\n    \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eStandardized 12038 Form Factor:\u003c\/strong\u003e Measures exactly \u003cstrong\u003e120mm x 120mm x 38mm\u003c\/strong\u003e, making it a universal drop-in replacement for thick-frame, high-static-pressure cooling applications in industrial chassis and equipment.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eDirect 2-Wire Operation:\u003c\/strong\u003e Simple and robust 2-wire design (Positive\/Negative) running on standard \u003cstrong\u003e12V DC\u003c\/strong\u003e at a highly efficient \u003cstrong\u003e0.40A\u003c\/strong\u003e draw, ensuring direct-to-power reliability without complex PWM controllers.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eContinuous Duty Ready:\u003c\/strong\u003e The \"B\" designation in RDM1238B typically denotes a \u003cstrong\u003eBall Bearing\u003c\/strong\u003e system, superior to standard sleeve bearings for high-temperature environments, horizontal mounting, and continuous 24\/7 operation.\u003c\/li\u003e\n    \u003c\/ul\u003e\n\n    \u003ch2\u003eSEO Introduction\u003c\/h2\u003e\n    \u003cp\u003eThe \u003cstrong\u003eXFAN RDM1238B\u003c\/strong\u003e is a heavy-duty, industrial-grade \u003cstrong\u003eDC Axial Cooling Fan\u003c\/strong\u003e designed for rigorous thermal management. Utilizing the industry-standard \u003cstrong\u003e12038 size profile (120 x 120 x 38 mm)\u003c\/strong\u003e, this 38mm thick frame provides significantly higher static pressure and air volume compared to standard 25mm thick PC fans. Operating efficiently on a \u003cstrong\u003e12V DC\u003c\/strong\u003e supply with a current draw of exactly \u003cstrong\u003e0.40A\u003c\/strong\u003e, it strikes an optimal balance between aggressive heat evacuation and energy efficiency. Configured with a straightforward \u003cstrong\u003e2-wire lead\u003c\/strong\u003e setup (Red for Vcc, Black for Ground), it is engineered for \"always-on\" direct drive applications, eliminating points of failure associated with complex tachometer or PWM circuits. It is an essential replacement component for variable frequency drives (VFDs), welding machines, telecom cabinets, and legacy server enclosures.\u003c\/p\u003e\n\n    \u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n    \u003cdiv style=\"overflow-x: auto;\"\u003e\n        \u003ctable class=\"koeed-table\"\u003e\n            \u003cthead\u003e\n                \u003ctr\u003e\n                    \u003cth\u003eSpecification Category\u003c\/th\u003e\n                    \u003cth\u003eTechnical Details\u003c\/th\u003e\n                \u003c\/tr\u003e\n            \u003c\/thead\u003e\n            \u003ctbody\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/td\u003e\n                    \u003ctd\u003eXFAN (Xinruilian \/ X-Fan)\u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\u003cstrong\u003eModel Number\u003c\/strong\u003e\u003c\/td\u003e\n                    \u003ctd\u003eRDM1238B\u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\u003cstrong\u003eOperating 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\u003eCurrent Draw\u003c\/strong\u003e\u003c\/td\u003e\n                    \u003ctd\u003e0.40 A\u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\u003cstrong\u003ePower Consumption\u003c\/strong\u003e\u003c\/td\u003e\n                    \u003ctd\u003e4.8 W (Calculated: 12V x 0.40A)\u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\u003cstrong\u003eDimensions (L x W x D)\u003c\/strong\u003e\u003c\/td\u003e\n                    \u003ctd\u003e120 mm x 120 mm x 38 mm (12038 format)\u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\u003cstrong\u003eWiring Configuration\u003c\/strong\u003e\u003c\/td\u003e\n                    \u003ctd\u003e2-Wire (Red: Positive +, Black: Ground \/ Negative -)\u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\u003cstrong\u003eBearing System\u003c\/strong\u003e\u003c\/td\u003e\n                    \u003ctd\u003eBall Bearing (Extended lifespan, omnidirectional mounting)\u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\u003cstrong\u003eFrame \u0026amp; Impeller Material\u003c\/strong\u003e\u003c\/td\u003e\n                    \u003ctd\u003eUL94V-0 compliant thermoplastic (PBT)\u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\u003cstrong\u003eSpeed Control \/ Sensor\u003c\/strong\u003e\u003c\/td\u003e\n                    \u003ctd\u003eNone (Direct drive, runs at 100% speed when powered)\u003c\/td\u003e\n                \u003c\/tr\u003e\n            \u003c\/tbody\u003e\n        \u003c\/table\u003e\n    \u003c\/div\u003e\n\n    \u003ch2\u003eApplication Matrix\u003c\/h2\u003e\n    \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eIndustrial VFDs \u0026amp; Inverters:\u003c\/strong\u003e Essential for evacuating dense heat generated by high-power IGBT modules within automated motor control cabinets.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eWelding Equipment:\u003c\/strong\u003e Withstands the harsh, dust-heavy environments of fabrication shops, keeping internal transformers and rectifiers within safe thermal limits.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eTelecommunications \u0026amp; Networking:\u003c\/strong\u003e The 38mm thick frame generates the high static pressure necessary to push cooling air through densely packed relay racks and power supply units (PSUs).\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eCryptocurrency Mining \u0026amp; Server Racks:\u003c\/strong\u003e Serves as a reliable, high-uptime exhaust fan where continuous 100% duty cycle operation is mandatory.\u003c\/li\u003e\n    \u003c\/ul\u003e\n\n    \u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n    \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eCan I connect this 2-wire fan to a 3-pin or 4-pin motherboard header?\u003c\/strong\u003e Yes. A 2-wire fan can be plugged into a 3-pin or 4-pin header. You must align the Black wire with the Ground (GND) pin and the Red wire with the 12V pin. However, because it lacks a tachometer (yellow wire) and PWM control (blue wire), the motherboard cannot read its RPM, and the fan will run continuously at 100% maximum speed.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eThe fan is not spinning when powered on. What should I check?\u003c\/strong\u003e First, verify the polarity; DC fans are highly polarity-sensitive. Ensure Red is connected to +12V and Black is to Ground. Second, use a multimeter to confirm the power supply is actually delivering 12V DC. If polarity and voltage are correct but the fan is dead, the internal motor coil is likely burnt out.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eCan I run this 12V fan on a 24V industrial power supply?\u003c\/strong\u003e \u003cstrong\u003eNo.\u003c\/strong\u003e Supplying 24V to a fan rated strictly for 12V DC will cause the internal coils to overheat rapidly, resulting in catastrophic motor failure, melting, and potential fire hazard. Always use a step-down buck converter if only 24V is available.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eWhy is the fan vibrating loudly or making a grinding noise?\u003c\/strong\u003e Loud grinding or heavy vibration typically indicates that the internal ball bearings have reached the end of their service life, or that physical debris has unbalanced the impeller blades. To prevent damage to the equipment chassis from resonant vibration, the fan should be replaced immediately.\u003c\/li\u003e\n    \u003c\/ul\u003e\n\n    \u003ch3\u003eCross-Reference Guide\u003c\/h3\u003e\n    \u003cp\u003eThe \u003cstrong\u003e120x120x38mm\u003c\/strong\u003e form factor is an industry standard. If the XFAN RDM1238B is unavailable, it can be seamlessly substituted with other major brands, provided you match the \u003cstrong\u003e12V DC\u003c\/strong\u003e voltage and approximate the \u003cstrong\u003e0.40A\u003c\/strong\u003e current draw to ensure similar airflow performance:\u003c\/p\u003e\n    \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eDelta Electronics:\u003c\/strong\u003e AFB1212 \/ FFB1212 Series (Ensure you select a variant close to 0.40A; Delta often makes much higher amperage server fans that will be significantly louder).\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eSunon:\u003c\/strong\u003e EEC0381B1 \/ MEC0381V1 Series (12038, 12V, Ball Bearing).\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eNidec \/ Sanyo Denki:\u003c\/strong\u003e Look for their standard 120x120x38mm, 12V DC, 2-wire configurations.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eImportant Note:\u003c\/strong\u003e When swapping brands, always reuse your original connector plug if the new fan comes with bare leads. Simply splice and heat-shrink the Red to Red, and Black to Black.\u003c\/li\u003e\n    \u003c\/ul\u003e\n\n\u003c\/div\u003e\n\n\u003cstyle\u003e\n    .koeed-container {\n        width: 100%;\n        color: #333;\n        line-height: 1.6;\n        box-sizing: border-box;\n    }\n    .koeed-container h2 {\n        color: #0056b3;\n        border-bottom: 2px solid #16c8c8;\n        padding-bottom: 5px;\n        margin-top: 30px;\n    }\n    .koeed-container h3 {\n        color: #0056b3;\n        margin-top: 20px;\n    }\n    .koeed-container ul, .koeed-container ol {\n        padding-left: 20px;\n    }\n    .koeed-container li {\n        margin-bottom: 10px;\n    }\n    .koeed-container strong {\n        color: #111;\n    }\n    .koeed-table {\n        width: 100%;\n        border-collapse: collapse;\n        margin-top: 15px;\n        margin-bottom: 15px;\n        min-width: 600px;\n    }\n    .koeed-table th, .koeed-table td {\n        border: 1px solid #eeeeee;\n        padding: 12px;\n        text-align: left;\n    }\n    .koeed-table th {\n        background-color: #0056b3;\n        color: #ffffff;\n    }\n    .koeed-table tbody tr:nth-child(odd) {\n        background-color: #f4fcfc;\n    }\n    .koeed-table tbody tr:nth-child(even) {\n        background-color: #fafafa;\n    }\n\u003c\/style\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"FAQPage\",\n      \"mainEntity\": [\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Can I connect this 2-wire fan to a 3-pin or 4-pin motherboard header?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"Yes. A 2-wire fan can be plugged into a 3-pin or 4-pin header. You must align the Black wire with the Ground (GND) pin and the Red wire with the 12V pin. However, because it lacks a tachometer (yellow wire) and PWM control (blue wire), the motherboard cannot read its RPM, and the fan will run continuously at 100% maximum speed.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"The fan is not spinning when powered on. What should I check?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"First, verify the polarity; DC fans are highly polarity-sensitive. Ensure Red is connected to +12V and Black is to Ground. Second, use a multimeter to confirm the power supply is actually delivering 12V DC. If polarity and voltage are correct but the fan is dead, the internal motor coil is likely burnt out.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Can I run this 12V fan on a 24V industrial power supply?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"No. Supplying 24V to a fan rated strictly for 12V DC will cause the internal coils to overheat rapidly, resulting in catastrophic motor failure, melting, and potential fire hazard. Always use a step-down buck converter if only 24V is available.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Why is the fan vibrating loudly or making a grinding noise?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"Loud grinding or heavy vibration typically indicates that the internal ball bearings have reached the end of their service life, or that physical debris has unbalanced the impeller blades. To prevent damage to the equipment chassis from resonant vibration, the fan should be replaced immediately.\"\n          }\n        }\n      ]\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"RDM","offers":[{"title":"Default Title","offer_id":44449107509433,"sku":"266882449469","price":26.06,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0268\/8476\/7929\/files\/new_1_pcs_XFAN_Fan_12CM_2_wire_cooling_fan_RDM1238B_DC12V_0_40A_12038___RDM__1.webp?v=1775394750","url":"https:\/\/koeed.com\/es\/products\/new-1-pcs-xfan-fan-12cm-2-wire-cooling-fan-rdm1238b-dc12v-0-40a-12038","provider":"KOEED","version":"1.0","type":"link"}