250 PSI Pressure Rating: Engineered for high-pressure environments where standard controllers fail

As a veteran-grade HVAC furnace drain kit part

while the large expansion chamber handles thermal expansion and overpressure conditions without premature seat failure

The heavy-duty internal windings are vacuum-impregnated to withstand thermal cycling and high-voltage stress

or erratic high-side and low-side pressures during operation

Carrier HH18HA497 Limit Switch 319852-301 250 PSI Pressure Rating: EngineeredThe Carrier HH18HA497 Limit Switch is a critical safety component designed for precise thermal monitoring in residential and commercial furnaces. As a genuine OEM replacement part, this 190 degree open limit switch is engineered to open the electrical circuit when the heat exchanger cabinet reaches its maximum safety threshold, preventing equipment damage and hazardous conditions. When the temperature drops to the 150 degree close setpoint, the switch