Trane THT2436 Limit Switch The MARS 12787 is a

The MARS 12787 is a heavy-duty 40/7

a vital safety requirement that forces a manual inspection of the heat exchanger and venting system before the furnace can be returned to service

Smith ProLine series equipment

or an audible humming sound from the outdoor unit without ignition

this MARS 12790 50/5 MFD 440VAC unit is engineered for continuous duty in demanding environments

Trane THT2436 Limit Switch The MARS 12787 is aThe Trane THT2436 is a mission critical HVAC high limit switch designed for furnace temperature regulation and system safety. This OEM Trane replacement part serves as the direct successor for the legacy 1NT21L 2163 model. Engineered as an automatic reset limit switch with an SPST (single pole, single throw) configuration, the device is calibrated to open the circuit at 170F and automatically re close once temperatures drop back to 140F. This precise