Mars MR300 Manual Reset Limit Switch, Open on Temp Rise 300 (39043)

About the Mars MR300 Manual Reset Limit Switch, Open on Temp Rise 300 (39043)

Shop now for a bargain on the Mars 39043 300 Limit Switch MR300 Manual Reset 3/4" here 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 an industry leader in both innovation and affordability.