{"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","url":"https:\/\/tophvacparts.com\/products\/trane-american-standard-swt01275-thermal-limit-switch-135-f","provider":"HVAC Parts and Equipment Depot Open To Homeowners and Contractors","version":"1.0","type":"link"}