Mars L220-4 Limit Switch, Open on Temp Rise at 220, Auto Close at 180 (39026)

About the Mars L220-4 Limit Switch, Open on Temp Rise at 220, Auto Close at 180 (39026)

Buy now and get the Mars 39026 220 Limit Switch L220-40 Auto 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. It will remain off until the switch automatically closes the circuit when the temperature reaches the off threshold. Mars is a leader in the industry for obvious reasons. They make great HVAC solutions.