Modine 3H0400780003 Limit Switch

The Modine 3H0400780003 is a high-performance L220-40F Limit Switch designed for critical thermal protection in Modine Hot Dawg units and industrial air handlers. This SPDT high limit switch is engineered to open on temperature rise at 220°F and automatically reset when the temperature cools to 40°F. As a veteran-grade HVAC replacement part, it provides an exact fit for stalk mount configurations, ensuring the safety of the heat exchanger by interrupting the burner circuit during an overheat condition. This OEM component serves as the direct replacement for 5H0757690001 and 5H75769-1, maintaining the electrical integrity and safety standards of the original equipment. With a 15A at 250V rating and automatic reset functionality, this Modine unit heater part is essential for contractors performing maintenance on HD30, HD45, and HDS series heaters where reliable high-limit sensing is non-negotiable for system longevity and code compliance.

Key Benefits:

• Precision Thermal Protection: Factory-calibrated L220-40F settings ensure precise cutout at 220°F to prevent heat exchanger fatigue.
• Direct OEM Compatibility: Seamlessly replaces Modine 5H0757690001 and 5H75769-1 without the need for mounting modifications.
• Robust Electrical Rating: Rated for up to 15 Amps at 250V, providing reliable SPDT (Single Pole Double Throw) switching under load.
• Industrial Stalk Mount Design: High-stalk configuration allows for optimal sensing bulb placement within the airflow stream for faster response times.
• Automatic Reset Logic: Eliminates manual intervention by closing the circuit once the unit cools to 40°F, restoring normal operation safely.

Common Questions:

Is the Modine 3H0400780003 compatible with Hot Dawg HD30 and HD125 heaters?
Yes, this limit switch is the standard thermal safety component for Modine Hot Dawg models including the HD30, HD45, HD125, HDS30, HDS45, and HDS125 series.

Which parts does the 3H0400780003 replace?
This part is the official successor to legacy part numbers 5H0757690001, 5H75769-1, 3H40078-3, and 5H75001.

Can I use this as a manual reset switch?
No, this is an automatic reset limit switch. If your unit requires a manual reset for safety code reasons, verify your specific model requirements before installation.

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.