Mars L155-2 Limit Switch, Open on Temp Rise at 155, Auto Close at 135 (39090)

About the Mars L155-2 Limit Switch, Open on Temp Rise at 155, Auto Close at 135 (39090)

Shop and save on the Mars 39090 L155-2 Limit Switch online at PlumbersStock.com. Limit switches are sensors that detect when a furnace has exceeded operational temperature limits and shut the appliance down as a safety measure. The way it works is that if your temperature gets to a concerning level, the limit switch will automatically open the circuit so it shuts off. It will remain off until the switch automatically closes the circuit when the temperature reaches the off threshold. Mars manufactures heating and cooling solutions that are both innovative and practical.