Modine 3H0400780001 Limit Switch
The Modine 3H0400780001 High Limit Switch is a critical safety component designed for heavy-duty HVACR applications where thermal protection is paramount. This L165-40F limit switch is engineered to monitor excessive heat buildup, featuring a precise 165 degree Fahrenheit trip point. As a veteran-grade HVAC replacement part, it functions as a primary fail-safe by interrupting the electrical circuit (typically 20 amps at 120/240 VAC) when the temperature exceeds safety thresholds, preventing potential heat exchanger damage or fire hazards. The manual reset design ensures that a technician must inspect the system for the root cause of overheating before the heating cycle can resume, a vital feature for commercial unit heater safety and industrial furnace maintenance. This flush-mount limit switch provides direct thermal contact for accurate sensing and is a standard OEM Modine control for various gas-fired and electric unit heaters. With a 40°F differential, it offers the reliability required for rigorous field use, maintaining the integrity of the HVAC thermal protection system.
Key Benefits
- Critical Thermal Protection: Automatically breaks the circuit at 165°F to prevent equipment overheating and ensure safe HVAC operation.
- Manual Reset Security: Requires a manual intervention after a high-limit event, allowing contractors to diagnose airflow or combustion issues before restarting.
- OEM Compatibility: Genuine Modine 3H0400780001 component ensures exact fitment and performance standards in Modine unit heaters and furnaces.
- Heavy-Duty Electrical Rating: Capable of handling up to 20 amps, making it suitable for both residential and demanding industrial heating systems.
- Flush-Mount Design: Facilitates easy installation and provides superior thermal response compared to older stalk-mount style switches.
Common Questions
What does the L165-40F designation mean for this switch?
The "L165" indicates that the switch is a high limit set to open the circuit at 165°F on a temperature rise. The "40F" refers to the temperature differential, meaning the switch can be reset once the temperature has dropped by 40 degrees from the trip point.
Can I use this Modine 3H0400780001 to replace an auto-reset limit switch?
It is standard practice to replace like-for-like. This manual reset limit switch is often required by code in specific heating applications to ensure a professional inspection occurs after a high-limit trip. Always verify with the wiring diagram provided on your specific Modine unit.
Is this switch compatible with 240V systems?
Yes, the electrical ratings for this HVAC high limit control typically support up to 240 VAC at 20 amps, covering a wide range of commercial and residential heating equipment.
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.
Original: $51.97
-65%$51.97
$18.19Modine 3H0400780001 Limit Switch
The Modine 3H0400780001 High Limit Switch is a critical safety component designed for heavy-duty HVACR applications where thermal protection is paramount. This L165-40F limit switch is engineered to monitor excessive heat buildup, featuring a precise 165 degree Fahrenheit trip point. As a veteran-grade HVAC replacement part, it functions as a primary fail-safe by interrupting the electrical circuit (typically 20 amps at 120/240 VAC) when the temperature exceeds safety thresholds, preventing potential heat exchanger damage or fire hazards. The manual reset design ensures that a technician must inspect the system for the root cause of overheating before the heating cycle can resume, a vital feature for commercial unit heater safety and industrial furnace maintenance. This flush-mount limit switch provides direct thermal contact for accurate sensing and is a standard OEM Modine control for various gas-fired and electric unit heaters. With a 40°F differential, it offers the reliability required for rigorous field use, maintaining the integrity of the HVAC thermal protection system.
Key Benefits
- Critical Thermal Protection: Automatically breaks the circuit at 165°F to prevent equipment overheating and ensure safe HVAC operation.
- Manual Reset Security: Requires a manual intervention after a high-limit event, allowing contractors to diagnose airflow or combustion issues before restarting.
- OEM Compatibility: Genuine Modine 3H0400780001 component ensures exact fitment and performance standards in Modine unit heaters and furnaces.
- Heavy-Duty Electrical Rating: Capable of handling up to 20 amps, making it suitable for both residential and demanding industrial heating systems.
- Flush-Mount Design: Facilitates easy installation and provides superior thermal response compared to older stalk-mount style switches.
Common Questions
What does the L165-40F designation mean for this switch?
The "L165" indicates that the switch is a high limit set to open the circuit at 165°F on a temperature rise. The "40F" refers to the temperature differential, meaning the switch can be reset once the temperature has dropped by 40 degrees from the trip point.
Can I use this Modine 3H0400780001 to replace an auto-reset limit switch?
It is standard practice to replace like-for-like. This manual reset limit switch is often required by code in specific heating applications to ensure a professional inspection occurs after a high-limit trip. Always verify with the wiring diagram provided on your specific Modine unit.
Is this switch compatible with 240V systems?
Yes, the electrical ratings for this HVAC high limit control typically support up to 240 VAC at 20 amps, covering a wide range of commercial and residential heating equipment.
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.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Modine 3H0400780001 High Limit Switch is a critical safety component designed for heavy-duty HVACR applications where thermal protection is paramount. This L165-40F limit switch is engineered to monitor excessive heat buildup, featuring a precise 165 degree Fahrenheit trip point. As a veteran-grade HVAC replacement part, it functions as a primary fail-safe by interrupting the electrical circuit (typically 20 amps at 120/240 VAC) when the temperature exceeds safety thresholds, preventing potential heat exchanger damage or fire hazards. The manual reset design ensures that a technician must inspect the system for the root cause of overheating before the heating cycle can resume, a vital feature for commercial unit heater safety and industrial furnace maintenance. This flush-mount limit switch provides direct thermal contact for accurate sensing and is a standard OEM Modine control for various gas-fired and electric unit heaters. With a 40°F differential, it offers the reliability required for rigorous field use, maintaining the integrity of the HVAC thermal protection system.
Key Benefits
- Critical Thermal Protection: Automatically breaks the circuit at 165°F to prevent equipment overheating and ensure safe HVAC operation.
- Manual Reset Security: Requires a manual intervention after a high-limit event, allowing contractors to diagnose airflow or combustion issues before restarting.
- OEM Compatibility: Genuine Modine 3H0400780001 component ensures exact fitment and performance standards in Modine unit heaters and furnaces.
- Heavy-Duty Electrical Rating: Capable of handling up to 20 amps, making it suitable for both residential and demanding industrial heating systems.
- Flush-Mount Design: Facilitates easy installation and provides superior thermal response compared to older stalk-mount style switches.
Common Questions
What does the L165-40F designation mean for this switch?
The "L165" indicates that the switch is a high limit set to open the circuit at 165°F on a temperature rise. The "40F" refers to the temperature differential, meaning the switch can be reset once the temperature has dropped by 40 degrees from the trip point.
Can I use this Modine 3H0400780001 to replace an auto-reset limit switch?
It is standard practice to replace like-for-like. This manual reset limit switch is often required by code in specific heating applications to ensure a professional inspection occurs after a high-limit trip. Always verify with the wiring diagram provided on your specific Modine unit.
Is this switch compatible with 240V systems?
Yes, the electrical ratings for this HVAC high limit control typically support up to 240 VAC at 20 amps, covering a wide range of commercial and residential heating equipment.
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.
