Zone Sensor w/SetPt and 3Spd Fan It has a greater range of applications because it does not have any mechanically moving parts This product is designed to be mounted on a DIN rail Trane RLY3715 Start Relay SPST 35Amp Start Relay SPST 35Amp RLY3715 This is a generic product description for this item This is a picture of Trane RLY3715 Start Relay SPST 35Amp Start Relay SPST 35Amp RLY3715 Electrical component designed to operate the starter motor of a compressor RLY3715 Start Relay SPST 35Amp RLY3715 This is an aftermarket replacement part, it may look different than your original but rest assured it will fit and work properly! On start-up, in response to a control signal, it completes an electrical circuit that activates the compressor The RLY3715 start relay is a replacement for the two-post and interrupter type relays This Start Relay is a replacement for RLY3715 and is compatible with Trane heating and cooling systems It is used in the units listed below With no contacts to corrode or bind, the unit is rated for long life and high reliability Description Description Description Description Description Description Description The start relay provides 5 Amps @ 24VDC to start the condenser fan motor in one minute or less Relay 35 Amp Start SPST 120VAC The Trane RLY3715 is a Start Relay SPST 35Amp