L4029 Reset Limit Control opens a line or low voltage circuit if the air temperature reaches a critical level. L4029 acts as a fire thermostat in the ducts of AC & ventilating systems. If the air temperature indicates a fire, the fan is shut down.

• Shuts off the fan when air temperature is indicative of fire
• Internal snap-acting switch actuated by a bimetal strip inserted directly into the air stream responds rapidly to temperature changes
• Requires manual reset