About the Mars MR170 Manual Reset Limit Switch, Open on Temp Rise 170 (39095)
Shop for savings on the Mars 39095 170 Limit Switch MR170 Manual Reset 3/4" online 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 because of their quality HVAC solutions.