{"title":"Trane Furnace Limit Switches | High \u0026 Low Voltage OEM Safety Parts","description":"\u003cp\u003e     Ensure your heating system operates safely with genuine \u003cstrong\u003eTrane furnace limit switches.\u003c\/strong\u003e We carry a full selection of high-limit and low-voltage fan limit controls,\u003cstrong\u003e including manual reset and automatic reset switches\u003c\/strong\u003e. These critical safety components are designed to monitor internal temperatures and prevent overheating in your \u003cstrong\u003eTrane furnace\u003c\/strong\u003e. Search our inventory by the \u003cstrong\u003eL-number \u003c\/strong\u003eor \u003cstrong\u003epart number\u003c\/strong\u003e found on your existing switch (e.g., THT or SWT) to find the exact temperature-rated replacement for your model.\u003c\/p\u003e","products":[{"product_id":"swt01280-trane-thermal-limit-switch-cut-out-155-f-direct-replacement","title":"SWT01280 Trane Thermal Limit Switch CUT OUT 155°F Direct Replacement","description":"\u003ch1\u003e\u003cstrong\u003eTrane \/ American Standard SWT01280 Genuine OEM Furnace Limit Switch (155°F \/ L155-30F Rating)\u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe Trane \/ American Standard \u003cstrong\u003eSWT01280\u003c\/strong\u003e is a \u003cstrong\u003ehigh-limit thermal safety device\u003c\/strong\u003e engineered for HVAC furnaces and other heating equipment. This is a Genuine OEM part designed to prevent system overheating by functioning as a critical safety shut-off. The switch continuously monitors the heat exchanger temperature and is precisely calibrated to \"\u003cstrong\u003eopen\u003c\/strong\u003e\" the electrical circuit at \u003cstrong\u003e155°F\u003c\/strong\u003e. This action cuts power to the heating element (gas valve) to prevent damage. Once the temperature decreases to \u003cstrong\u003e125°F\u003c\/strong\u003e, the switch automatically \u003cstrong\u003e\"closes\"\u003c\/strong\u003e the circuit, allowing the system to operate normally and safely.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Thermal Safety:\u003c\/strong\u003e Calibrated to \"Open\" the circuit at 155°F, providing immediate shutdown to protect critical furnace components.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic Reset:\u003c\/strong\u003e The switch automatically \"Closes\" at 125°F, allowing the heating system to restart automatically once safe temperatures are restored (30°F differential).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Amperage Rating:\u003c\/strong\u003e Rated for robust electrical loads (5.8 FLA @ 120V AC), ensuring reliability in various residential and light commercial applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGenuine OEM Component:\u003c\/strong\u003e Ensures exact fitment and adherence to strict Trane and American Standard safety and performance specifications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eProduct Details \u0026amp; Specification\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Trane \/ American Standard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e SWT01280\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDescription: \u003c\/strong\u003e Thermal Limit Switch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpen Temperature (Cut Out):\u003c\/strong\u003e 155°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClose Temperature (Cut In):\u003c\/strong\u003e 125°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Length:\u003c\/strong\u003e Surface\/Board Mount Design\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrical Rating: \u003c\/strong\u003e 5.8 FLA \/ 34.8 LRA @ 120V AC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerminal Type:\u003c\/strong\u003e Quick Connect\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Poles:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight: \u003c\/strong\u003e 1.5 lbs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e🛠️ HVAC Depot Pro Tip\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eA limit switch with an L155-30F rating is a standard high-limit for many 80% and 90%+ efficiency furnaces. If this switch is consistently tripping, the most probable cause is insufficient airflow. Check for an excessively dirty air filter, blocked return air ducts, or a faulty blower motor capacitor that is preventing the fan from running at the correct speed. Do not attempt to bypass this switch; it is a critical safety device designed to prevent a potential fire hazard.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eCross-Reference\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eSuperseded Part: \u003c\/strong\u003e\u003c\/h3\u003e\nSWT01280, SWT1280 (older, shortened version)\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eLegacy \/ Manufacturing Numbers: \u003c\/strong\u003e\u003c\/h3\u003e\nC340056P18, X13540649180, 270159795307\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eRating ID: \u003c\/strong\u003e\u003c\/h3\u003e\nL155-30F (engineering number indicating a 155°F limit switch with a 30°F differential).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eModel Compatibility\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThis limit switch is compatible with various Trane and American Standard high-efficiency furnaces and packaged units. \u003cstrong\u003eBelow are common compatible model prefixes; always verify the exact fit with your unit's data plate.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTrane Models:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTDD\u003c\/strong\u003e: TDD080C945A2, TDD080R9V3A1, TDD120C960C4, TDD1B080A9451BA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTDE\u003c\/strong\u003e: TDE080A945B0, TDE120A960K1, TDE1B080A9451AC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTUD\u003c\/strong\u003e: TUD120C960J0, TUD1D120A9601AB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCDB\u003c\/strong\u003e\/CDE: CDB080A945A0, CDB1B080A9451AB, CDE120A960C1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOther\u003c\/strong\u003e: FCAB080A40A0 (Downflow), FCAD120A50E0\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eAmerican Standard Models:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eADD\u003c\/strong\u003e: ADD080C945A2, ADD080R9V3B0, ADD120C960B1, ADD1B080A9451AA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eADE\u003c\/strong\u003e: ADE1B060A9361AA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAUD\u003c\/strong\u003e: AUD120C960J1, AUD1D120A9601BA\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Trane \/ American Standard","offers":[{"title":"Default Title","offer_id":52580461281643,"sku":"SWT01280","price":73.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0922\/9683\/9531\/files\/SWT01273-3_7f07fa67-9fd9-4383-b238-3c1a72acd2d9.jpg?v=1764100520"},{"product_id":"limit-switch-swt01274-opens-125-close-95-trane-oem-replacement","title":"Limit Switch SWT01274, Opens @ 125 Close@ 95 Trane OEM Replacement","description":"\u003ch1\u003e\u003cstrong\u003eTrane \/ American Standard SWT01274 Genuine OEM Furnace Limit Switch (125°F \/ 3\" Insert)\u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe Trane \/ American Standard \u003cstrong\u003eSWT01274\u003c\/strong\u003e is an original equipment manufacturer (OEM) safety component designed to prevent furnace overheating. This thermal limit switch is specifically calibrated to monitor the internal temperature of the plenum. It acts as a critical safety shut-off, designed to \u003cstrong\u003eopen\u003c\/strong\u003e the electrical circuit at \u003cstrong\u003e125°F\u003c\/strong\u003e, which safely shuts down the heating unit. Once the switch \u003cstrong\u003ecools down to 95°\u003c\/strong\u003eF, it automatically closes the circuit, allowing the furnace to resume normal operation. This switch ensures the furnace remains within safe thermal parameters, protecting vital components like the heat exchanger.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow-Temperature Safety Limit:\u003c\/strong\u003e Calibrated to \"Open\" at 125°F, providing immediate shutdown in specific commercial or packaged units that operate at lower airflow temperatures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic Reset Function: \u003c\/strong\u003eThe switch \"Closes\" the circuit at 95°F, ensuring the system can automatically recover after a temporary overheat condition is resolved.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRobust Electrical Rating:\u003c\/strong\u003e Handles substantial electrical loads (5.8 FLA @ 120V AC), compatible with a wide range of residential and commercial units.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGenuine OEM Reliability:\u003c\/strong\u003e This is an authentic Trane\/American Standard part, built to precise factory standards, ensuring perfect fitment and safety compliance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eProduct Details Specification\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Trane \/ American Standard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e SWT01274\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDescription: \u003c\/strong\u003e Thermal Limit Switch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpen Temperature (Cut Out): \u003c\/strong\u003e 125°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClose Temperature (Cut In): \u003c\/strong\u003e 95°F (30°F Differential)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Length:\u003c\/strong\u003e Surface\/Board Mount (Typically 3\" overall size, not probe)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrical Rating: \u003c\/strong\u003e 5.8 FLA \/ 34.8 LRA @ 120V AC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerminal Type:\u003c\/strong\u003e Quick Connect\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Poles:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight: \u003c\/strong\u003e 1.5 lbs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e🛠️ HVAC Depot Pro Tip\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eA limit switch with a 125°F set point is usually a secondary or auxiliary limit in high-BTU downflow furnaces or specific packaged commercial units. It's often monitoring a different zone than the main limit. If this limit trips, ensure the ductwork configuration matches the manufacturer's specification (e.g., minimum duct length or required elbows). Low-temperature tripping often points to excessive airflow, which is rare, or more likely a misapplication of the limit switch location or a non-OEM replacement issue.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eCross-Reference\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eSuperseded Part: \u003c\/strong\u003e\u003c\/h3\u003e\nSWT01274, SWT1274, 389649, 349020\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eLegacy \/ Manufacturing Numbers: \u003c\/strong\u003e\u003c\/h3\u003e\nC340056P12, X13540649120, 270159794707\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eRating ID:\u003c\/strong\u003e\u003c\/h3\u003e\nL125-30F (Indicating 125°F trip and 30°F differential).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eModel Compatibility\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eThis limit switch is compatible with various Trane and American Standard high-efficiency furnaces and packaged units. Below are common compatible model prefixes; always verify the exact fit with your unit's data plate.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTrane Models:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTDD\u003c\/strong\u003e: TDD120R9V5A1, TDD120R9V5B0, TDD140C960A0, TDD140C960C1, TDD2C100ACV52AB, TDD2D120A9V5VAA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTUD\u003c\/strong\u003e: TUD1C080A9H41AA, TUD1C080A9H41BA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eAmerican Standard Models:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eADD\u003c\/strong\u003e: ADD120R9V5A1, ADD120R9V5C4, ADD140C960A1, ADD140R960C0, ADD2C100ACV52AC, ADD2D120A9V5VAB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAUD\u003c\/strong\u003e: AUD1C080A9H41BA, AUD1C080G9H41AA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eCommercial Packaged Units:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4YCC\/4YCY\/4YCZ: \u003c\/strong\u003e4YCC4042A1090AA, 4YCC4060E1115AA, 4YCY5036A1090AD, 4YCZ5036E1090AA, 4YCZ6036C1090AB\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Trane \/ American Standard","offers":[{"title":"Default Title","offer_id":52580488773995,"sku":"SWT01274","price":83.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0922\/9683\/9531\/files\/SWT01274.jpg?v=1764095929"},{"product_id":"swt01273-trane-oem-replacement-furnace-high-limit-switch-220-f-open","title":"SWT01273 Trane OEM Replacement Furnace High Limit Switch 220°F Open","description":"\u003ch1\u003e\u003cstrong\u003eTrane \/ American Standard SWT01273 Genuine OEM Furnace Limit Switch (220°F \/ 3\" Insert)\u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe Trane \/ American Standard \u003cstrong\u003eSWT01273\u003c\/strong\u003e is a \u003cstrong\u003ehigh-limit safety switch\u003c\/strong\u003e designed for use in heavy-duty HVAC furnaces and commercial units. As a Genuine \u003cstrong\u003eOEM\u003c\/strong\u003e component, it acts as a crucial safety shut-off mechanism that protects the system from overheating. This switch monitors operational temperatures and is calibrated to instantly break the electrical circuit to the gas valve if temperatures exceed \u003cstrong\u003e220°F\u003c\/strong\u003e. This action prevents heat exchanger damage and potential fire hazards. The \u003cstrong\u003e3-inch probe\u003c\/strong\u003e ensures accurate sensing within the plenum of high-BTU equipment. \u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme Temperature Protection:\u003c\/strong\u003e Engineered to safely \"Open\" the circuit at 220°F, providing essential protection for the furnace heat exchanger.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic Reset Function:\u003c\/strong\u003e The switch automatically \"Closes\" and allows the heating operation to restart once the internal temperature decreases to 190°F.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable OEM Construction:\u003c\/strong\u003e Built to rigorous Trane and American Standard specifications with a robust 5.8 FLA current rating at 120V AC.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeep-Reach 3\" Probe:\u003c\/strong\u003e Features a 3-inch insertion length for accurate, board- or surface-mounted temperature monitoring. \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eProduct Details Specification\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Trane \/ American Standard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e SWT01273\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDescription: \u003c\/strong\u003e Thermal Limit Switch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpen Temperature (Cut Out):\u003c\/strong\u003e 220°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClose Temperature (Cut In):\u003c\/strong\u003e 190°F (30°F Differential)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Length:\u003c\/strong\u003e 3.0 Inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrical Rating:\u003c\/strong\u003e 5.8 FLA \/ 34.8 LRA @ 120V AC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerminal Type:\u003c\/strong\u003e Quick Connect\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Poles:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 1.50 lbs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResettable: \u003c\/strong\u003e Automatically resets\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e🛠️ HVAC Depot Pro Tip\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eA limit switch operating at such a high range (L220-30F) is typically found in older or specific commercial-grade units where internal temperatures naturally run hotter. If your SWT01273 is tripping frequently, ensure there are no physical obstructions blocking the airflow immediately downstream of the heat exchanger, such as closed dampers or crushed ductwork. High static pressure is the most common cause of this high-limit tripping\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eCross-Reference\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eSuperseded Part:\u003c\/strong\u003e\u003c\/h3\u003e\nSWT01273, SWT1273\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eLegacy \/ Manufacturing Numbers:\u003c\/strong\u003e\u003c\/h3\u003e\nC340056P10, X13540649100, 270159845007\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eDrawing Number:\u003c\/strong\u003e\u003c\/h3\u003e\nX13541189-01\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eRating ID: \u003c\/strong\u003e\u003c\/h3\u003e\nL220-30F (Indicating 220°F trip and 30°F differential). \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eModel Compatibility\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThis limit switch is compatible with various Trane and American Standard high-efficiency furnaces and packaged units. \u003cstrong\u003eBelow are common compatible model prefixes; always verify the exact fit with your unit's data plate. \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003eTrane Models:\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTUD\u003c\/strong\u003e: TUD060C936K1, TUD080C924B1, TUD1A060A9361AA, TUD1B080A9241AA, TUD2A060A9362AA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTUE\u003c\/strong\u003e: TUE060A936L1, TUE1A060A9361AA, TUE1A060A9361AC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTDD\u003c\/strong\u003e: Check data plate for specific TDD models.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCUB\u003c\/strong\u003e: CUB060A936C3, CUB1A060A9361AA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003eAmerican Standard Models:\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAUD\u003c\/strong\u003e: AUD060C936K1, AUD080C924B1, AUD080R936K5, AUD1A060A9361AA, AUD1B080A9241BA, AUD2A060A9362AB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAUE\u003c\/strong\u003e: AUE1A060A9361AA, AUE1A060A9361AC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eADD\u003c\/strong\u003e: Check data plate for specific ADD models. \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003eAmeristar \/ RunTru Models:\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eM801P060AU36AAA, M801P060AU36AAB\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Trane \/ American Standard","offers":[{"title":"Default Title","offer_id":52580508926315,"sku":"SWT01273","price":73.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0922\/9683\/9531\/files\/SWT01273-1.jpg?v=1764095804"},{"product_id":"swt01277trane-oem-replacement-limit-switch-open-at-145-f-close-at-115-f","title":"SWT01277 Trane OEM Replacement Limit Switch Open at 145°F, Close at 115°F","description":"\u003ch1\u003e\u003cstrong\u003eTrane \/ American Standard SWT01277 Genuine OEM Furnace Limit Switch (145°F \/ 3\" Insert)\u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe Trane \/ American Standard \u003cstrong\u003eSWT01277\u003c\/strong\u003e is an official Genuine \u003cstrong\u003eOEM thermal limit switch \u003c\/strong\u003edesigned for vital safety functions within HVAC equipment. This safety device constantly monitors internal system temperatures. The switch functions by \u003cstrong\u003eopening \u003c\/strong\u003ethe electrical circuit at \u003cstrong\u003e145\u003c\/strong\u003e°F and \u003cstrong\u003eclosing \u003c\/strong\u003eit at \u003cstrong\u003e115\u003c\/strong\u003e°F, acting as a rapid safety shut-off for the equipment if the temperature exceeds the set limit. It is a robust 3-inch insertion limit switch commonly found in various Trane and American Standard furnaces and packaged units.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Thermal Operation:\u003c\/strong\u003e Calibrated to safely \"Open\" the electrical circuit at 145°F, immediately cutting power to the gas valve during an overheat event.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic System Reset:\u003c\/strong\u003e The switch automatically \"Closes\" at 115°F, allowing the system to resume normal operation once safe temperatures are restored.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimal Sensing Depth: \u003c\/strong\u003eFeatures a 3-inch insertion size (probe length), ensuring the sensor reaches the critical airflow stream for accurate temperature monitoring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Reliability \u0026amp; Safety: \u003c\/strong\u003eManufactured to rigorous Trane\/American Standard specifications, handling electrical loads up to 5.8 FLA at 120V AC with quick connect terminals.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eProduct Details \u0026amp; Specification\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Trane \/ American Standard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e SWT01277\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDescription\u003c\/strong\u003e: Thermal Limit Switch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpen Temperature:\u003c\/strong\u003e 145°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClose Temperature:\u003c\/strong\u003e 115°F (30°F Differential)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Length: \u003c\/strong\u003e 3.0 Inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrical Rating:\u003c\/strong\u003e 5.8 FLA \/ 34.8 LRA @ 120V AC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerminal Type:\u003c\/strong\u003e Quick Connect\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Poles:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 1.5 lbs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e🛠️ HVAC Depot Pro Tip\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eA lower temperature trip point like 145°F is typical for smaller-BTU or packaged rooftop units (RTUs) which have different internal airflow dynamics than standard upflow furnaces. If this limit switch consistently trips, do not bypass it. Instead, check the evaporator coil for being frozen solid, a severely blocked intake vent, or a weak blower capacitor, as these restrict necessary airflow.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eCross-Reference\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eSuperseded Part: \u003c\/strong\u003e\u003c\/h3\u003e\nSWT01277, SWT1277\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eLegacy \/ Manufacturing Numbers: \u003c\/strong\u003e\u003c\/h3\u003e\nC340056P15, X13540649150, 270159795007, X13541189-01\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eRating ID: \u003c\/strong\u003e\u003c\/h3\u003e\nL145-30F (Indicates 145°F trip and 30°F differential).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNote: L180-30F may appear on drawing lists but the active part is L145-30F.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eModel Compatibility\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThis limit switch is compatible with various Trane and American Standard high-efficiency furnaces and packaged units.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eBelow are common compatible model prefixes; always verify the exact fit with your unit's data plate.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eTrane \u0026amp; American Standard Packaged\/Furnace Models (GBC Series):\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGBC036 Series:\u003c\/strong\u003e GBC036A3ELA, GBC036A3ELB01, GBC036A3ELB020, GBC036A3ELB03A, GBC036A4ELA, GBC036A4ELB04A1, GBC036A4ELB08C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGBC048 Series:\u003c\/strong\u003e GBC048A3ELA, GBC048A3ELB02, GBC048A3ELB04, GBC048A4ELA0, GBC048A4ELB030, GBC048A4ELB07B000A1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGBC060 Series:\u003c\/strong\u003e GBC060A3ELA, GBC060A3ELB01C0, GBC060A3ELB02C004, GBC060A4ELA, GBC060A4ELB03A, GBC060A4ELB09C100A1\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Trane \/ American Standard","offers":[{"title":"Default Title","offer_id":52580521902443,"sku":"SWT01277","price":74.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0922\/9683\/9531\/files\/SWT01277.jpg?v=1764095489"},{"product_id":"trane-american-standard-swt01275-thermal-limit-switch-135-f","title":"Trane \/ American Standard SWT01275 Thermal Limit Switch - 135°F","description":"\u003ch1\u003e\u003cstrong\u003eTrane \/ American Standard SWT01275 Thermal Limit Switch - 135°F Open \/ 105°F Close (3\" Insert) \u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp\u003eThe Trane and American Standard SWT01275 is a genuine OEM high-temperature thermal limit switch designed as a critical safety component for residential and light commercial gas furnaces. This automatic-reset switch monitors the internal temperature of the heat exchanger or blower compartment, providing a \"Normally Closed\" (N\/C) circuit that breaks upon reaching its 135°F threshold. This safety interlock prevents system overheating and potential damage by interrupting the ignition sequence or blower operation if temperatures exceed factory-safe limits. \u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic Reset Safety: \u003c\/strong\u003eDesigned to automatically reset the circuit once temperatures drop below the closing threshold (105°F), restoring normal system operation without manual intervention.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Calibration:\u003c\/strong\u003e Factory-set to open at 135°F and close at 105°F (L135-30F rating), ensuring accurate thermal protection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Fit \u0026amp; Finish: \u003c\/strong\u003eFeatures a standard 3-inch insert length for precise placement within the airflow path of Trane and American Standard units.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Life Cycle: \u003c\/strong\u003eRated for up to 100,000 switching cycles, providing long-term reliability in demanding HVAC environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSPST Configuration: \u003c\/strong\u003eSingle-Pole, Single-Throw (SPST) normally closed logic for seamless integration with modern furnace control boards. \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eProduct Details \u0026amp; Specification\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Type:\u003c\/strong\u003e Thermal Limit Switch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand: \u003c\/strong\u003e Trane \/ American Standard (Therm-O-Disc)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpening Temp: \u003c\/strong\u003e 135°F (Open on Temperature Rise)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClosing Temp: \u003c\/strong\u003e 105°F (Close on Temperature Drop)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCircuit: \u003c\/strong\u003e Normally Closed (N\/C), SPST\u003c\/li\u003e\n\u003cli\u003eI\u003cstrong\u003ensert Length: \u003c\/strong\u003e 3 Inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage\/Current: \u003c\/strong\u003e 120V AC (5.8 FLA \/ 34.8 LRA)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerminal Type: \u003c\/strong\u003e 1\/4\" Quick Connect\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReset Type:\u003c\/strong\u003e Automatic\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003e🛠️ HVAC Depot Pro Tip\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eA tripped SWT01275 limit switch is almost always a symptom of a larger airflow issue rather than a faulty part. Before replacing, check for a dirty air filter, blocked return grilles, or a failing blower motor. If the switch \"pops\" frequently, it can weaken over time; however, replacing it without fixing the underlying airflow restriction will likely result in the new part tripping immediately.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eCross-Reference\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eSuperseded Part:\u003c\/strong\u003e\u003c\/h3\u003e\nThere are no older Trane part numbers for this specific switch, though it is often searched as SWT1275.\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eLegacy \/ Manufacturing Numbers: \u003c\/strong\u003e\u003c\/h3\u003e\nC340056P13, 36T01B3, 42283, A1730, P13\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eRating ID:\u003c\/strong\u003e\u003c\/h3\u003e\nL135-30F (indicating 135°F trip and 30°F differential). \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eModel Compatibility \u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThis limit switch is compatible with various Trane and American Standard high-efficiency furnaces and packaged units. Below are common compatible model prefixes; always verify the exact fit with your unit's data plate.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eTrane Models:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eADD Models:\u003c\/strong\u003e ADD060C936F0, ADD100R9V5F1, ADD100R9V5F2, ADD100R9V5F3, ADD1D120A9H51BA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCDB Models\u003c\/strong\u003e: CDB060A936D0, CDB060A936D1, CDB060A936D3, CDB1A060A9361AA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eADE Models: \u003c\/strong\u003eADE1A060A9361AA, ADE1A060A9361AB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4YCC\/4YCY Models:\u003c\/strong\u003e 4YCC4036A1090AA, 4YCY4048C1115AA, 4YCZ6048C1115AA \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eAmerican Standard Models:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eADC Models\u003c\/strong\u003e: ADC060C936C1, ADC100C960A1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAUD Models\u003c\/strong\u003e: AUD2B080ACV32AA, AUD2D120B9V5VAA, AUD2D120H9V5VAA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eADD Models\u003c\/strong\u003e: ADD1A060A9361AA, ADD1A060A9361AB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFCAC Models: \u003c\/strong\u003eFCAC100A50A0, FCAC100A50D1 \u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Trane \/ American Standard","offers":[{"title":"Default Title","offer_id":52582810124651,"sku":"SWT01275","price":50.36,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0922\/9683\/9531\/files\/SWT01275.jpg?v=1764094519"},{"product_id":"trane-oem-replacement-swt01263-limit-switch-opens-210f-closes-180f","title":"Trane OEM Replacement SWT01263 Limit Switch Opens-210F,Closes-180F","description":"\u003ch1\u003e\u003cstrong\u003eTrane \/ American Standard SWT01263 Genuine OEM Furnace Limit Switch (210°F \/ 3\" Insert)\u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp\u003eThe Trane \/ American Standard \u003cstrong\u003eSWT01263\u003c\/strong\u003e is a \u003cstrong\u003ehigh-limit thermal\u003c\/strong\u003e safety switch engineered to protect your HVAC equipment from severe overheating. As a Genuine\u003cstrong\u003e OEM\u003c\/strong\u003e component, this switch acts as a critical fail-safe by monitoring the internal plenum temperature. If the temperature reaches the factory-set threshold of \u003cstrong\u003e210°F\u003c\/strong\u003e, the switch immediately opens the electrical circuit to shut down the heating process, preventing potential damage to the heat exchanger and ensuring house-wide safety. Designed for board or surface mounting, its\u003cstrong\u003e 3-inch probe\u003c\/strong\u003e provides deep-reach thermal sensing for high-capacity furnace models.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCritical Overheat Protection:\u003c\/strong\u003e Calibrated to \"Open\" at 210°F, providing a high-limit safety ceiling for specific high-output gas furnaces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Auto-Reset:\u003c\/strong\u003e The switch automatically \"Closes\" at 180°F to allow the system to resume operation once safe thermal levels are restored.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3-Inch Deep Sensing:\u003c\/strong\u003e The extended 3\" insertion length ensures the sensor is properly positioned in the airflow stream for the most accurate temperature detection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustrial Build Quality:\u003c\/strong\u003e Rated for 5.8 FLA at 120V, this switch is built to handle the electrical demands of residential and light commercial Trane and American Standard units.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eProduct Details \u0026amp; Specification\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Trane \/ American Standard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e SWT01263\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDescription:\u003c\/strong\u003e Thermal Limit Switch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpen Temperature\u003c\/strong\u003e: 210°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClose Temperature:\u003c\/strong\u003e 180°F (30°F Differential)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Length:\u003c\/strong\u003e 3.0 Inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrical Rating:\u003c\/strong\u003e 5.8 FLA \/ 34.8 LRA @ 120V AC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerminal Type:\u003c\/strong\u003e Quick Connect\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Poles:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight: \u003c\/strong\u003e1.5 lbs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003e🛠️ HVAC Depot Pro Tip\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eA limit switch with a 210°F trip point is often found in units with higher BTU ratings or specific downflow configurations. If this switch trips, it is vital to inspect your blower wheel for dust accumulation and ensure your secondary heat exchanger isn't restricted. Constant \"limit tripping\" at these high temperatures can lead to metal fatigue in your heat exchanger. Always verify that the limit you are replacing matches the temperature stamped on the side of the original part.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eCross-Reference\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eSuperseded Part:\u003c\/strong\u003e\u003c\/h3\u003e\nSWT01263, SWT1263\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eLegacy \/ Manufacturing Numbers: \u003c\/strong\u003e\u003c\/h3\u003e\nC340056P09, X13540649090, 270159672807\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003cstrong\u003eRating ID: \u003c\/strong\u003e\u003c\/h3\u003e\nL210-30F (Indicates 210°F trip and 30°F differential).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eModel Compatibility\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThis limit switch is compatible with various Trane and American Standard high-efficiency furnaces and packaged units. Below are common compatible model prefixes; always verify the exact fit with your unit's data plate.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTrane Models:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTDD\u003c\/strong\u003e: TDD060C924C3, TDD060C924D0, TDD060C924E0, TDD1A060A9241AA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTUD\u003c\/strong\u003e: TUD080C948A0, TUD080R948A0, TUD100C945H3, TUD100C960A0, TUD1B080A9481BA, TUD2D100A9602AB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTUE\u003c\/strong\u003e: TUE080A948A1, TUE080A948B0, TUE1B080A9481AA, TUE1B080A9481AC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCUB\u003c\/strong\u003e\/CUE: CUB080A948A0, CUB1B080A9481AA, CUE080A948H1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOther\u003c\/strong\u003e: TUJ080A948A0, FUAB100A40A0, FUAB100A40B0, FUAB100A40E0\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eAmerican Standard Models:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eADD\u003c\/strong\u003e: ADD060C924C3, ADD060C924E0, ADD060C924F0, ADD060C924F1, ADD1A060A9241BA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAUD\u003c\/strong\u003e: AUD080C948A1, AUD080R948A2, AUD100C945H1, AUD100C960A1, AUD100R961H5, AUD2D100A9602AB\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eRunTru Models:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eM801P060AD24AAB, M801P060AD36AAB, M801P080BU48AAC\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Trane \/ American Standard","offers":[{"title":"Default Title","offer_id":52582946603371,"sku":"SWT01263","price":73.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0922\/9683\/9531\/files\/SWT01263.jpg?v=1764023332"},{"product_id":"trane-oem-replacement-swt01259-limit-switch-opens-190-f-closes-160f","title":"Trane OEM Replacement SWT01259 Limit Switch Opens-190-F,Closes-160F","description":"\u003ch2\u003e\u003cstrong\u003eTrane \/ American Standard SWT01259 Genuine OEM Furnace Limit Switch (190°F \/ 3\" Insert)\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e      The Trane \/ American Standard \u003cstrong\u003eSWT01259\u003c\/strong\u003e is a high-temperature primary safety limit designed for heavy-duty \u003cstrong\u003egas furnace\u003c\/strong\u003e applications. As a Genuine\u003cstrong\u003e OEM component\u003c\/strong\u003e, it serves as the critical \"fail-safe\" for your heating system. Calibrated to monitor the heat exchanger's internal plenum temperature, this switch is engineered to \"open\" the circuit at 190°F, immediately shutting off the \u003cstrong\u003egas valve\u003c\/strong\u003e if the system begins to overheat. This prevents structural damage to the heat exchanger and ensures the furnace remains within manufacturer-specified safety parameters. Its extended 3-inch probe allows for precise temperature detection deep within the airflow.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Threshold Thermal Protection: \u003c\/strong\u003eSafely \"Opens\" at 190°F to protect the furnace from catastrophic heat damage due to airflow failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic Reset Technology: \u003c\/strong\u003eDesigned to automatically \"Close\" and restore power to the gas valve once the temperature cools to 160°F (30°F differential).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeep-Reach 3\" Probe:\u003c\/strong\u003e The 3-inch insert length ensures the sensing element is positioned accurately in the hottest part of the plenum for high-BTU units.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Performance Standard:\u003c\/strong\u003e Built to exact factory specifications for Trane and American Standard, maintaining the original UL\/CSA safety certification of the furnace.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eProduct Details \u0026amp; Specification\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand: \u003c\/strong\u003e Trane \/ American Standard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e SWT01259\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComponent Type:\u003c\/strong\u003e Primary Limit Switch (L190-30)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpen Temperature:\u003c\/strong\u003e 190°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClose Temperature: \u003c\/strong\u003e 160°F (30°F Differential)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Length:\u003c\/strong\u003e 3.0 Inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrical (FLA):\u003c\/strong\u003e 5.8 Amps @ 120V AC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrical (LRA):\u003c\/strong\u003e 34.8 Amps @ 120V AC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerminal Type:\u003c\/strong\u003e Quick Connect\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Poles:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 1.5 lbs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e🛠️ HVAC Depot Pro Tip\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eA limit switch tripping at 190°F is a serious warning sign. While the switch itself may fail over time, it often \"pops\" because of a significant airflow restriction. Before installing your new SWT01259, check for a dirty secondary heat exchanger or a failing capacitor on the blower motor. If the internal temperature regularly hits 190°F, it can cause the heat exchanger to crack, which is a major safety hazard. Always test for gas leaks around the manifold after any service.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eCross-Reference\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSupersedes \/ Legacy \/ Drawing Numbers:\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eSWT1259 (Current shorthand)\u003c\/li\u003e\n\u003cli\u003eL190-30F (Thermal Specification)\u003c\/li\u003e\n\u003cli\u003eC340056P04 (Factory Drawing #)\u003c\/li\u003e\n\u003cli\u003eX13540649040\u003c\/li\u003e\n\u003cli\u003e270159672407\u003c\/li\u003e\n\u003cli\u003eA2143\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eModel Compatibility\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThis limit switch is compatible with various Trane and American Standard high-efficiency furnaces and packaged units. Below are common compatible model prefixes; always verify the exact fit with your unit's data plate. \u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTrane Models:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTDC \u003c\/strong\u003e(TDC100, TDC120 series)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTDD \u003c\/strong\u003e(TDD040C924F1, TDD040C924F2, TDD040C924C4)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTUC \u003c\/strong\u003e(TUC080C942B3, TUC100C948B6)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTUD \u003c\/strong\u003e(TUD040, TUD060, TUD080, TUD100, TUD120)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTUE \u003c\/strong\u003e(TUE1B080, TUE1C100, TUE080A936L2)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eAmerican Standard Models:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eADC \u003c\/strong\u003e(ADC120C960B4, ADC080C942B8)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eADD \u003c\/strong\u003e(ADD100, ADD120 series)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAUC \u003c\/strong\u003e(AUC120C960B4, AUC080C942B7)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAUD \u003c\/strong\u003e(AUD040, AUD060, AUD080, AUD100, AUD120)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAUE \u003c\/strong\u003e(AUE1B080, AUE1C100 series)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Trane \/ American Standard","offers":[{"title":"Default Title","offer_id":52582988349803,"sku":"SWT01259","price":39.77,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0922\/9683\/9531\/files\/SWT01259.jpg?v=1764022977"},{"product_id":"trane-limit-switch-swt3031-oem-replacement-open-190f-close-160f","title":"Trane Limit Switch SWT3031, OEM Replacement, Open-190F, Close-160F","description":"\u003ch1\u003e\u003cstrong\u003eTrane SWT03031 High Limit Thermal Switch – Genuine OEM (190°F \/ 160°F)\u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp\u003eThe Trane \u003cstrong\u003eSWT03031\u003c\/strong\u003e is a critical thermal safety limit switch designed for Trane and American Standard HVAC systems. Its primary job is to protect your home and equipment by monitoring the furnace temperature. If the system reaches a dangerous \u003cstrong\u003e190°F\u003c\/strong\u003e, the switch automatically \"opens\" to shut off the burners. Once the system cools to a safe \u003cstrong\u003e160°F\u003c\/strong\u003e, the switch \"closes,\" allowing the furnace to reset and resume operation.\u003c\/p\u003e\n\u003cp\u003eAs a genuine OEM part, the \u003cstrong\u003eSWT03031\u003c\/strong\u003e ensures your furnace maintains its factory safety ratings and operates exactly as engineered.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features \u0026amp; Benefits\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Protection:\u003c\/strong\u003e Acts as a fail-safe to prevent heat exchanger damage and fire hazards by stopping the system during an overheat event.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic Reset: \u003c\/strong\u003eSelf-resetting design (160°F Close) means no manual intervention is required once the system cools.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGenuine OEM Quality: \u003c\/strong\u003eReplaces common manufacturer numbers like C340366P15 and L190-30F with factory-level precision.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal Quick-Connect: \u003c\/strong\u003eFeatures standard terminal types for a fast, secure DIY or professional installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Trane \/ American Standard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e SWT03031 (SWT3031)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCut OFF (Opens):\u003c\/strong\u003e 190°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCut IN (Closes):\u003c\/strong\u003e 160°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrical Rating:\u003c\/strong\u003e 5.8 FLA \/ 34.8 LRA @ 120V AC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow Voltage Rating:\u003c\/strong\u003e 200 MA @ 24V AC (1.5A Max)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Poles:\u003c\/strong\u003e 1 (Single Pole)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 1.5 lbs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerminal Type:\u003c\/strong\u003e Quick Connect\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType: \u003c\/strong\u003eThermal Limit Switch\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e🛠️ HVAC DEPOT Pro Tip: Is Your Limit Switch \"Tripping\"?\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eIf your furnace is short-cycling (turning off before reaching the thermostat setting), your SWT03031 is likely doing its job. Before replacing it, check your air filter. 90% of limit switch \"trips\" are caused by restricted airflow from a dirty filter or blocked vents. If the filter is clean and the furnace still shuts down, the switch may be \"weak\" or failed and requires immediate replacement.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eCross-Reference \u0026amp; Part Numbers\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThis limit switch is a direct replacement for the following P\/N, Drawing Numbers, and X Numbers:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eC340366P15\u003c\/li\u003e\n\u003cli\u003eX13540827150\u003c\/li\u003e\n\u003cli\u003e389696\u003c\/li\u003e\n\u003cli\u003eL190-30F (Commonly found on the side of the original part)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eExtensive Model Compatibility List\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eNote: This is a partial list. Use 'CTRL+F' to find your specific model below.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe SWT03031 is commonly found in the following American Standard and Trane furnace model numbers:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eAmerican Standard Models:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eADC1B080A9421AC, ADC1B080A9421AD, ADC1B080A9421AE, ADC1B080A9421AF, ADC1B080A9421AG\u003c\/li\u003e\n\u003cli\u003eADX080R942W7, ADX1B080A9421AC, ADX1B080A9421AD, ADX1B080A9H31BB\u003c\/li\u003e\n\u003cli\u003eADX2B080A9422AA, ADX2B080A9422AB\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eTrane Models:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCDX1B080A9421AC\u003c\/li\u003e\n\u003cli\u003eTDC1B080A9421AC, TDC1B080A9421AD, TDC1B080A9421AE, TDC1B080A9421AF, TDC1B080A9421AG\u003c\/li\u003e\n\u003cli\u003eTDX080R942W7, TDX1B080A9421AC, TDX1B080A9421AD, TDX1B080A9H31BB\u003c\/li\u003e\n\u003cli\u003eTDX2B080A9422AA, TDX2B080A9422AB\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cbr\u003e\u003c\/h2\u003e\n\u003ch2\u003e\u003cstrong\u003eSWT03031 is often found in the following furnace model numbers:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003ch3\u003e\u003cstrong\u003eAmerican Standard furnace model numbers:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eADC1B080A9421AC\u003c\/li\u003e\n\u003cli\u003eADC1B080A9421AD\u003c\/li\u003e\n\u003cli\u003eADC1B080A9421AE\u003c\/li\u003e\n\u003cli\u003eADC1B080A9421AF\u003c\/li\u003e\n\u003cli\u003eADC1B080A9421AG\u003c\/li\u003e\n\u003cli\u003eADX080R942W7\u003c\/li\u003e\n\u003cli\u003eADX1B080A9421AC\u003c\/li\u003e\n\u003cli\u003eADX1B080A9421AD\u003c\/li\u003e\n\u003cli\u003eADX1B080A9H31BB\u003c\/li\u003e\n\u003cli\u003eADX2B080A9422AA\u003c\/li\u003e\n\u003cli\u003eADX2B080A9422AB\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTrane Furnace model numbers:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCDX1B080A9421AC\u003c\/li\u003e\n\u003cli\u003eTDC1B080A9421AC\u003c\/li\u003e\n\u003cli\u003eTDC1B080A9421AD\u003c\/li\u003e\n\u003cli\u003eTDC1B080A9421AE\u003c\/li\u003e\n\u003cli\u003eTDC1B080A9421AF\u003c\/li\u003e\n\u003cli\u003eTDC1B080A9421AG\u003c\/li\u003e\n\u003cli\u003eTDX080R942W7\u003c\/li\u003e\n\u003cli\u003eTDX1B080A9421AC\u003c\/li\u003e\n\u003cli\u003eTDX1B080A9421AD\u003c\/li\u003e\n\u003cli\u003eTDX1B080A9H31BB\u003c\/li\u003e\n\u003cli\u003eTDX2B080A9422AA\u003c\/li\u003e\n\u003cli\u003eTDX2B080A9422AB\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Trane \/ American Standard","offers":[{"title":"Default Title","offer_id":52590941208939,"sku":"SWT03031","price":58.35,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0922\/9683\/9531\/files\/SWT03031.jpg?v=1764023135"},{"product_id":"trane-limit-switch-swt01635-oem-replacement-open-180f-close-150f","title":"Trane Limit Switch SWT01635, OEM Replacement, Open-180F, Close-150F","description":"\u003ch1\u003e\u003cstrong\u003eTrane \/ American Standard SWT01635 Genuine OEM Furnace Limit Switch (180°F \/ 3\" Insert) \u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe Trane \/ American Standard \u003cstrong\u003eSWT01635\u003c\/strong\u003e is a \u003cstrong\u003ehigh-limit safety\u003c\/strong\u003e \u003cstrong\u003edevice\u003c\/strong\u003e engineered for specific \u003cstrong\u003egas furnace\u003c\/strong\u003e configurations. As a Genuine \u003cstrong\u003eOEM\u003c\/strong\u003e component, it serves as the primary \"watchdog\" for your heat exchanger's temperature. If the internal plenum temperature reaches the critical threshold of 180°F, the switch breaks the electrical circuit to the gas valve, instantly halting combustion to prevent catastrophic heat exchanger failure or fire hazards. Its \u003cstrong\u003e3-inch probe\u003c\/strong\u003e is designed to penetrate deeper into the airflow to provide a more accurate reading in high-capacity furnaces. \u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Limit Thermal Protection: \u003c\/strong\u003eSpecifically calibrated to \"Open\" at 180°F, providing a higher safety ceiling for specific high-efficiency or large-BTU furnace models.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic Reset Logic:\u003c\/strong\u003e The switch is designed to \"Close\" and restore system operation once the temperature drops to 150°F, allowing for a 30°F cooling differential.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtended 3\" Probe Depth:\u003c\/strong\u003e Features a 3-inch insert length (Standard L180-30), ensuring the sensor is positioned correctly within the heat exchanger's discharge air stream.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Integrity: \u003c\/strong\u003eBeing a Genuine OEM part, it maintains the UL\/CSA safety ratings of your original equipment, which can be voided by using generic \"will-fit\" alternatives. \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eProduct Details \u0026amp; Specification\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Trane \/ American Standard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number: \u003c\/strong\u003e SWT01635\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Length:\u003c\/strong\u003e 3.0 Inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrical: \u003c\/strong\u003e24V \/ 120V (5.8 FLA @ 120V)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct: \u003c\/strong\u003e Thermal limit switch \/ Thermostat assembly\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent Rating: \u003c\/strong\u003e 5.8 FLA, 34.8 LRA at 120V AC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Poles: \u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 1.5 LB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerminal Type:\u003c\/strong\u003e Quick Connect\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerminal Type:\u003c\/strong\u003e Thermal Limit Switch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCut Out Temp: \u003c\/strong\u003eOpen Temperature: 180F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCut In Temp: \u003c\/strong\u003eClose Temperature: 150F\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e🛠️ HVAC Depot Pro Tip\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eA limit switch that trips at 180°F often indicates a significant airflow blockage or an oversized furnace for the ductwork. Before replacing SWT01635, verify that all supply registers are open and that the secondary heat exchanger (if applicable) is not plugged with debris. If the switch continues to trip after replacement, use a dual-port manometer to check your Total External Static Pressure to ensure your blower can move enough air to keep the heat exchanger cool. \u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eCross-Reference\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSupersedes \/ Legacy \/ Drawing Numbers:\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSWT1635\u003c\/strong\u003e (Current shorthand)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eL180-30F\u003c\/strong\u003e (Thermal Spec)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eC340366P06\u003c\/strong\u003e (Original Drawing #)\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eC340056P01\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSWT01257 \/ SWT1257\u003c\/strong\u003e \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eModel Compatibility\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eSWT01635 is a direct replacement in the following Trane and American Standard model numbers:\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTrane Models:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTDC \u003c\/strong\u003e(TDC120C960B4, TDC1B080A9421AD)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTDD \u003c\/strong\u003e(Standard 80% and 90%+ models)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTUC \u003c\/strong\u003e(TUC080C942B3, TUC100C948B6)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTUD \u003c\/strong\u003e(TUD100, TUD120 series)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTUH \u003c\/strong\u003e(TUH1D100A9601CB, TUH2C100A9V4VBA) \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eAmerican Standard Models:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eADC\u003c\/strong\u003e (ADC120C960B4, ADC080C942B8)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eADD\u003c\/strong\u003e (Legacy 80% Upflow\/Downflow)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAUC\u003c\/strong\u003e (AUC120C960B4, AUC080C942B7)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAUD\u003c\/strong\u003e (AUD100, AUD120 series)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAUH \u003c\/strong\u003e(AUH2B060A9V3VAA, AUH2C100A9V4VAB) \u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Trane \/ American Standard","offers":[{"title":"Default Title","offer_id":52591088042347,"sku":"SWT01635","price":17.45,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0922\/9683\/9531\/files\/SWT01635.jpg?v=1764022636"},{"product_id":"trane-limit-switch-180-open-150-close-swt01271","title":"Trane Limit Switch (180° Open, 150° Close), SWT01271","description":"\u003ch1 class=\"MsoNormal\"\u003eTrane Limit Switch (180° Open, 150° Close), SWT01271\u003c\/h1\u003e\n\u003cp class=\"MsoNormal\"\u003eThe \u003cb\u003eTrane SWT01271\u003c\/b\u003e is a mission-critical, genuine OEM safety component designed to serve as the \"thermal watchdog\" for your gas furnace. This high-limit switch functions as a normally closed circuit that monitors the temperature of the heat exchanger; if internal heat exceeds the safe threshold of 180°F, the switch snaps open to cut power to the gas valve, preventing catastrophic equipment failure or fire. Engineered specifically for Trane and American Standard furnaces, this \"brain\" of the safety circuit ensures that airflow remains within designed thermal parameters, automatically resetting once temperatures drop back to 150°F to resume normal heating cycles. \u003c\/p\u003e\n\u003ch2 class=\"MsoNormal\"\u003eKey Features:\u003c\/h2\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cbr\u003e• \u003cb\u003ePrecision Thermal Airflow Management:\u003c\/b\u003e Factory-calibrated to snap open at exactly 180°F, ensuring the furnace never operates at temperatures that could crack the heat exchanger.\u003cbr\u003e• \u003cb\u003eGenuine OEM Fitment:\u003c\/b\u003e Engineered with the exact mounting flange and terminal orientation of part number \u003cb\u003eSWT01271\u003c\/b\u003e, providing a \"plug-and-play\" replacement for legacy sensors.\u003cbr\u003e• \u003cb\u003eRapid Reset Technology:\u003c\/b\u003e Features a bimetal disc designed to close the circuit at 150°F, fixing \"short-cycling\" issues caused by worn or drifted aftermarket limit switches.\u003cbr\u003e• \u003cb\u003eNoise \u0026amp; Vibration Resistant:\u003c\/b\u003e Built with high-grade ceramic and metal housing to eliminate the \"rattling\" or intermittent connectivity issues found in lower-quality universal switches.\u003cbr\u003e• \u003cb\u003eIntegrated Safety Logic:\u003c\/b\u003e Designed to communicate directly with the furnace control board to trigger specific diagnostic fault codes if an over-temperature event occurs.\u003c\/p\u003e\n\u003ch2 class=\"MsoNormal\"\u003eProduct Details:\u003c\/h2\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cbr\u003e• \u003cb\u003ePart Number:\u003c\/b\u003e SWT01271\u003cbr\u003e• \u003cb\u003eManufacturer:\u003c\/b\u003e Trane \/ American Standard (Genuine OEM)\u003cbr\u003e• \u003cb\u003ePart Type:\u003c\/b\u003e Fixed Temperature High Limit Switch\u003cbr\u003e• \u003cb\u003eTemperature Open:\u003c\/b\u003e 180°F (82°C)\u003cbr\u003e• \u003cb\u003eTemperature Close:\u003c\/b\u003e 150°F (66°C)\u003cbr\u003e• \u003cb\u003eVoltage:\u003c\/b\u003e 24V \/ 120V Compatible\u003cbr\u003e• \u003cb\u003eRotation\/Mounting:\u003c\/b\u003e Surface Mount Flange\u003cbr\u003e• \u003cb\u003eShipping Weight:\u003c\/b\u003e 0.15 lbs\u003c\/p\u003e\n\u003ch2 class=\"MsoNormal\"\u003e\n\u003cspan style=\"font-family: 'Segoe UI Emoji',sans-serif; mso-bidi-font-family: 'Segoe UI Emoji';\"\u003e🛠️\u003c\/span\u003e HVAC Depot Pro Tip: Check the Air Filter First\u003c\/h2\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cbr\u003eIf your \u003cb\u003eSWT01271\u003c\/b\u003e is frequently \"tripping\" (opening), the switch is often doing its job correctly by reacting to a lack of airflow. Before replacing the limit, check for a dirty air filter, blocked return grilles, or a failing blower motor. A restricted system causes heat to build up rapidly, forcing the limit to open; repeatedly \"stressing\" a limit switch in this way will eventually cause the internal bimetal disc to fail in the open position.\u003c\/p\u003e\n\u003ch2 class=\"MsoNormal\"\u003eCross-Reference:\u003c\/h2\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cbr\u003e• \u003cb\u003eOEM Numbers:\u003c\/b\u003e SWT-1271, L180-30, B13701-52\u003cbr\u003e• \u003cb\u003eLegacy Numbers:\u003c\/b\u003e SWT00938, SWT01170, SWT01614\u003cbr\u003e• \u003cb\u003eDrawing Numbers:\u003c\/b\u003e D341103P12, 18-BA25D1-12\u003c\/p\u003e\n\u003ch2 class=\"MsoNormal\"\u003eModel Compatibility:\u003c\/h2\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cbr\u003e• \u003cb\u003eS9X1 Series:\u003c\/b\u003e S9X1B040, S9X1B060, S9X1C080, S9X1D120\u003cbr\u003e• \u003cb\u003eS9V2 Series:\u003c\/b\u003e S9V2B040, S9V2B060, S9V2C080, S9V2D120\u003cbr\u003e• \u003cb\u003eTUD\/TDD Series:\u003c\/b\u003e TUD1B040, TUD1B060, TUD1C080, TDD1B060\u003cbr\u003e• \u003cb\u003eAmerican Standard:\u003c\/b\u003e AUH1B040, AUH1B060, AUH1C080, ADH1B060\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e \u003c\/p\u003e","brand":"Trane \/ American Standard","offers":[{"title":"Default Title","offer_id":52653152731499,"sku":"SWT01271","price":95.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0922\/9683\/9531\/files\/SWT01271_9b89316b-cefe-48b0-a5c9-eb107e8329d7.jpg?v=1775063138"}],"url":"https:\/\/tophvacparts.com\/collections\/trane-furnace-limit-switches-high-low-voltage-oem-safety-parts.oembed","provider":"HVAC Parts and Equipment Depot","version":"1.0","type":"link"}