Replacement Relay

This high limit switch is a critical safety component designed for Modine Hot Dawg unit heaters, including HD30 and HD45 models equipped with hot surface ignition systems. The insertion-type limit control operates automatically to protect your heating equipment by cutting off power when temperatures exceed safe operating limits, preventing equipment damage and potential safety hazards. With an operating temperature range of 180-220 degrees Fahrenheit, this switch provides reliable overheat protection for commercial and industrial heating applications. This replacement part is compatible with various Modine furnace and Hot Dawg heater models and supersedes multiple older part numbers including 3H04778-3, 5H75769-2, 5H075769-001, 5H075769B1, 3H40078-3, and 3H0400780003, making it an ideal upgrade for existing installations. The high limit switch functions as a two-pole safety relay in 48VDC applications, ensuring dependable temperature control in demanding commercial heating environments. Whether you're performing routine maintenance on existing equipment or upgrading an aging system, this limit control switch delivers the performance and reliability that industrial operators expect. Verify compatibility with your specific Modine heater model and serial number before ordering to ensure proper fit and function. This essential safety component helps maintain optimal operating conditions while extending equipment lifespan through effective overheat protection.