Mars MR180 Manual Reset Limit Switch, Open on Temp Rise 180 (39096)

About the Mars MR180 Manual Reset Limit Switch, Open on Temp Rise 180 (39096)

Shop for the Mars 39096 180 Limit Switch MR180 Manual Reset 3/4" with the pros 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 is a popular HVAC brand among both homeowners and contractors for good reason.