The Trane SWT01612 (1NT23L-2177) is a high-reliability limit switch/thermostat designed to protect HVAC systems from overheating. Featuring a 3" insert probe and a temperature profile of L190F-30 (opens at 190F, closes at 160F), this component is essential for maintaining safe operating conditions in your Trane heating unit. Key Features Limit Switch with Thermostat Function Opens at 190F, closes at 160F (L190F-30) 3-inch insertion probe for accurate temperature sensing OEM Trane part for guaranteed compatibility Durable design for long-term performance in demanding conditions Specifications Part Number: SWT01612 / 1NT23L-2177 Type: Limit Switch / Thermostat Insertion Length: 3 inches Temperature Rating: Opens at 190F, Closes at 160F Mounting: Standard screw terminal Application: Furnace/Heater overheat protection Compatible Models AUC1D100A9601AC AUC1D120A9601AC AUC1C100A9481AB AUC1B060A9361AB AUC1B080A9421AD AUC1B040A9241AG AUC1D100A9601AF TDC120C960B5 TDC1B080A9421AB TDC1C100A9481AB Why Choose This Item This Trane SWT01612 limit switch offers precise thermal control and system protection for your HVAC unit. Designed to Trane?s exacting standards, it's a direct-fit OEM replacement that ensures operational safety and efficiency. Ideal for preventive maintenance or quick repairs, it delivers peace of mind and dependable performance.