The Trane A2143 (SWT01259 / C340056P04) is a high-performance limit switch/thermostat disc with auto reset functionality, designed for HVAC systems requiring precise temperature monitoring and protection. Featuring a 3-inch insert and a temperature range of 160F-190F, it ensures reliable cutoff and recovery to safeguard against overheating conditions in gas furnaces and air handlers. Key Features Auto reset thermostat disc for reliable cycling Temperature range: 160F cut-in to 190F cut-out 3" insert length for versatile applications Durable and accurate temperature control Ideal for safety in furnace heat exchangers and blower assemblies Specifications Model: A2143 Alternate Part Numbers: SWT01259, C340056P04 Type: Limit Switch / Thermostat Disc Reset Type: Auto Insert Length: 3 inches Temperature Rating: 160F - 190F Application: HVAC, heating units, gas furnaces Compatible Models TUD2C080B9V4VBA TUD2B080A9V3VB TUD2C080A9V4VB TDD100C948F1 TDD120C960F2 TDD080C936C4 TUD100C972H4 TUD140R9V5J1 TUD2C100A9482AA TUD2C080G9V4VAA Why Choose This Item Choose the Trane A2143 Limit Switch for OEM-quality temperature control, critical for maintaining the safe operation of Trane furnace systems. Its auto-reset mechanism, precise temp range, and compatibility with a wide range of Trane models make it a dependable and cost-effective solution for HVAC professionals and system maintenance.