{"product_id":"ntc20d20-circuit-protection-power-thermistor-20ohms","title":"NTC 20D-20 Circuit Protection Power Thermistor 20ohms Power Supply Repair","description":"\u003ch2\u003eNTC 20D-20 Power Thermistor 20Ω 250W – Mining PSU Inrush Current Protection\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eNTC 20D-20\u003c\/strong\u003e is a \u003cstrong\u003enegative temperature coefficient thermistor\u003c\/strong\u003e with a cold resistance of \u003cstrong\u003e20Ω\u003c\/strong\u003e, rated at \u003cstrong\u003e250W\u003c\/strong\u003e, in a \u003cstrong\u003e20mm through-hole disc\u003c\/strong\u003e package. It serves as an \u003cstrong\u003einrush current limiter\u003c\/strong\u003e on the AC input stage of mining power supplies — at power-on, the 20Ω resistance limits the surge of current into the bulk capacitors, then self-heats and drops to near-zero resistance for normal operation. Operating range \u003cstrong\u003e-40°C to +200°C\u003c\/strong\u003e, tolerance \u003cstrong\u003e±10%\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3\u003eWhy NTC Thermistors Fail in Mining PSUs\u003c\/h3\u003e\n\u003cp\u003eEvery time the PSU is powered on, the NTC thermistor absorbs the inrush energy. In mining environments where PSUs cycle on and off frequently — during maintenance, power outages or rolling restarts — the cumulative thermal stress degrades the device. A failed NTC either cracks open (PSU won't start) or shorts (no inrush protection, stressing the bridge rectifier and bulk capacitors on every power cycle). Replacing a failed NTC is a low-cost repair that prevents cascading damage to more expensive components.\u003c\/p\u003e\n\u003ch3\u003eReplacement Procedure\u003c\/h3\u003e\n\u003cp\u003eDisconnect mains and discharge bulk capacitors. Locate the NTC on the input filter board near the AC inlet — it is a large disc component with two radial leads. Desolder both leads, remove the old thermistor and install the new NTC 20D-20 through the same holes. Solder, trim leads, reassemble and verify the PSU powers on normally with a controlled inrush.\u003c\/p\u003e\n\u003ch4\u003eNTC 20D-20 Thermistor Specifications\u003c\/h4\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px;\"\u003eParameter\u003c\/th\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px;\"\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003ePart Number\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eNTC 20D-20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eCold Resistance\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003e20Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eRated Power\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003e250W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eTolerance\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003e±10%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eTemperature Range\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003e-40°C to +200°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003ePackage\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eThrough-hole disc, 20mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eCondition\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eNew\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003c\/h3\u003e\n\u003ch3\u003eRelated NTC Thermistors \u0026amp; PSU Protection Components\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/mf7210d15-ntc-thermistor-bitmain-apw3-power-supply-repair\"\u003eMF72 10D15 NTC Thermistor – APW3 PSU Repair\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ntc16d20-ntc16d-thermistor-power-supply-unit-repair-parts\"\u003eNTC 16D-20 Thermistor – PSU Repair Parts\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ntc5d15-thermistor-power-supply-unit-repair\"\u003eNTC 5D-15 Thermistor – PSU Repair\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ntc8d20-power-thermistor-8ohms-power-supply-innosilicon-whatsminer\"\u003eNTC 8D-20 Power Thermistor – Innosilicon \/ Whatsminer PSU\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eRepairing mining PSU input stages? \u003ca href=\"mailto:contact@lys-sz.com\"\u003eContact us at contact@lys-sz.com\u003c\/a\u003e for NTC thermistors, varistors and all input protection components.\u003c\/p\u003e\n\u003cp\u003eWorldwide shipping from our Shenzhen warehouse.\u003c\/p\u003e","brand":"LYS Shenzhen","offers":[{"title":"Default Title","offer_id":41743294202035,"sku":null,"price":0.23,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/6710\/4179\/files\/NTC-20D-20-Circuit-Protection-Power-Thermistor-20ohms-20mm-Power-Supply-Repair_3.webp?v=1746531853","url":"https:\/\/lys-sz.com\/products\/ntc20d20-circuit-protection-power-thermistor-20ohms","provider":"LYS Shenzhen","version":"1.0","type":"link"}