Modine 5H0735910003 Pressure Switch

The Modine 5H0735910003 Pressure Switch is a critical safety component designed for precise differential air pressure monitoring in Modine HVAC systems. This SPST (Single Pole Single Throw) switch features a fixed set point of 0.66" WC, ensuring the draft inducer or blower is moving sufficient air before allowing the ignition sequence to proceed. As a veteran-grade OEM replacement part, this model is the direct technical successor to the discontinued 5H73591-3. It is engineered with a durable brass housing and silver cadmium oxide contacts to maintain electrical integrity under high-cycling thermal conditions. Rated for 15A at 120VAC and 10A at 240VAC, it provides a 0.21" differential for stable operation, preventing nuisance tripping in gas-fired unit heaters. For technicians performing furnace pressure switch troubleshooting, this genuine Modine 5H0735910003 offers a standard 1/4" barb connection for seamless integration into existing pneumatic lines, ensuring your equipment meets original factory specifications for safety and efficiency.

• Direct OEM Compatibility: Serves as the exact replacement for the 5H73591-3, maintaining the precise 0.66" WC set point required by the manufacturer.
• Enhanced Durability: Constructed with silver cadmium oxide contacts and a brass housing to withstand the harsh environments of commercial HVACR applications.
• Reliable Switching: The SPST mechanism provides a clean "make or break" signal to the ignition control board based on combustion air flow.
• Optimized Performance: Features a 0.21" differential to ensure the system remains engaged during minor pressure fluctuations, reducing unit heater downtime.

• What does a 0.66" WC rating mean for this switch? This is the specific pressure at which the switch closes to allow the heater to fire. If the inducer cannot pull at least 0.66 inches of water column, the Modine 5H0735910003 remains open as a safety precaution.
• Can I use this to replace a 5H73591-3 model? Yes, the 5H0735910003 is the official direct replacement. It matches the original mounting, electrical, and pressure specifications.
• How do I know if my Modine pressure switch is failing? Common symptoms include the inducer motor running without the igniter glowing or recurring "pressure switch open" fault codes on the furnace control board.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.