Mars MR150 Manual Reset Limit Switch, Open on Temp Rise 150 (39038)

About the Mars MR150 Manual Reset Limit Switch, Open on Temp Rise 150 (39038)

Order now and get the Mars 39038 150 Limit Switch MR150 Manual Reset 3/4" at PlumbersStock. 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. The circuit will remain open/off until it is manually reset. Mars products will last you a long time, but parts will wear, and you can find replacements here when they do.