Enhanced Durability: Constructed with high-temperature alloys to resist flame sensor corrosion and oxidation over extended run cycles

confirming the system is correctly leveled and isolated

Direct Replacement: Precise fitment for the ASCO 318-247 eliminates the need for field modifications or hardware adjustments

4A pick-up and 14

Industry Standards: Class 2 safety rating ensures current limiting protection for the low-voltage side of the circuit

Reznor 193810 Switch 30067439-890 Enhanced Durability: Constructed with high-temperatureThe Reznor 193810 is a heavy duty air proving switch pre mounted in a protective enclosure, engineered specifically for Reznor HVAC systems. Designed for reliability in demanding commercial and industrial environments, this differential pressure switch acts as a primary safety mechanism to verify proper combustion airflow before allowing the ignition sequence to proceed. It serves as a direct OEM replacement for legacy part numbers including Reznor