Resideo RC840T-277 Electromechanical Relay
The Resideo RC840T-277 is a heavy-duty electromechanical relay engineered for controlling high-voltage loads in demanding HVACR applications. This switching solution features an integrated 24V transformer, making it ideal for interfacing 277 VAC line-voltage equipment with low-voltage controls. This relay provides reliable on/off switching for resistive and inductive loads, specifically optimized for electric heating systems and baseboard units. It is fully compatible with 2 3-wire thermostats, supporting 24V signals at 40 mA/1.2 VA. Built to handle harsh mechanical environments, it maintains a strict temperature rating of -4 to 140 degrees Fahrenheit. For contractors performing 277V HVAC relay installation, the compact design allows for easy mounting in standard 4-inch electrical boxes. This unit is a necessary component for line voltage to low voltage conversion, ensuring consistent performance in commercial power environments without the vibration issues common in lower-grade contactors.
Key Performance Benefits
- Integrated 24V Transformer: Eliminates the need for external power supplies when connecting line voltage loads to low voltage controllers.
- Universal Controller Compatibility: Works seamlessly with standard 24V HVAC controls and modern smart thermostats.
- High Voltage Reliability: Rated specifically for 277 VAC applications, ensuring long-term durability in commercial electrical circuits.
- Silent Operation: Designed to minimize mechanical noise during cycles, making it suitable for residential and professional spaces.
- Versatile Mounting: Includes a 1/2-inch NPT nipple for secure installation directly onto electrical junction boxes.
Common Questions
Can I use this relay with a 3-wire power-stealing thermostat?
Yes, the Resideo RC840T-277 is compatible with 3-wire systems and provides the 24V signal required for electronic thermostats to function correctly without additional power sources.
Is this unit rated for inductive loads like fans or motors?
While primarily used for resistive heating loads, this electromechanical relay is rated to handle inductive loads such as small fans or pumps, provided they do not exceed the amperage specifications at 277V.
What happens if the ambient temperature exceeds 140°F?
Exceeding the -4 to 140 degree temperature rating can lead to internal heat buildup and premature component failure. Ensure proper ventilation within the junction box during 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.
Original: $99.40
-65%$99.40
$34.79Resideo RC840T-277 Electromechanical Relay
The Resideo RC840T-277 is a heavy-duty electromechanical relay engineered for controlling high-voltage loads in demanding HVACR applications. This switching solution features an integrated 24V transformer, making it ideal for interfacing 277 VAC line-voltage equipment with low-voltage controls. This relay provides reliable on/off switching for resistive and inductive loads, specifically optimized for electric heating systems and baseboard units. It is fully compatible with 2 3-wire thermostats, supporting 24V signals at 40 mA/1.2 VA. Built to handle harsh mechanical environments, it maintains a strict temperature rating of -4 to 140 degrees Fahrenheit. For contractors performing 277V HVAC relay installation, the compact design allows for easy mounting in standard 4-inch electrical boxes. This unit is a necessary component for line voltage to low voltage conversion, ensuring consistent performance in commercial power environments without the vibration issues common in lower-grade contactors.
Key Performance Benefits
- Integrated 24V Transformer: Eliminates the need for external power supplies when connecting line voltage loads to low voltage controllers.
- Universal Controller Compatibility: Works seamlessly with standard 24V HVAC controls and modern smart thermostats.
- High Voltage Reliability: Rated specifically for 277 VAC applications, ensuring long-term durability in commercial electrical circuits.
- Silent Operation: Designed to minimize mechanical noise during cycles, making it suitable for residential and professional spaces.
- Versatile Mounting: Includes a 1/2-inch NPT nipple for secure installation directly onto electrical junction boxes.
Common Questions
Can I use this relay with a 3-wire power-stealing thermostat?
Yes, the Resideo RC840T-277 is compatible with 3-wire systems and provides the 24V signal required for electronic thermostats to function correctly without additional power sources.
Is this unit rated for inductive loads like fans or motors?
While primarily used for resistive heating loads, this electromechanical relay is rated to handle inductive loads such as small fans or pumps, provided they do not exceed the amperage specifications at 277V.
What happens if the ambient temperature exceeds 140°F?
Exceeding the -4 to 140 degree temperature rating can lead to internal heat buildup and premature component failure. Ensure proper ventilation within the junction box during 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.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Resideo RC840T-277 is a heavy-duty electromechanical relay engineered for controlling high-voltage loads in demanding HVACR applications. This switching solution features an integrated 24V transformer, making it ideal for interfacing 277 VAC line-voltage equipment with low-voltage controls. This relay provides reliable on/off switching for resistive and inductive loads, specifically optimized for electric heating systems and baseboard units. It is fully compatible with 2 3-wire thermostats, supporting 24V signals at 40 mA/1.2 VA. Built to handle harsh mechanical environments, it maintains a strict temperature rating of -4 to 140 degrees Fahrenheit. For contractors performing 277V HVAC relay installation, the compact design allows for easy mounting in standard 4-inch electrical boxes. This unit is a necessary component for line voltage to low voltage conversion, ensuring consistent performance in commercial power environments without the vibration issues common in lower-grade contactors.
Key Performance Benefits
- Integrated 24V Transformer: Eliminates the need for external power supplies when connecting line voltage loads to low voltage controllers.
- Universal Controller Compatibility: Works seamlessly with standard 24V HVAC controls and modern smart thermostats.
- High Voltage Reliability: Rated specifically for 277 VAC applications, ensuring long-term durability in commercial electrical circuits.
- Silent Operation: Designed to minimize mechanical noise during cycles, making it suitable for residential and professional spaces.
- Versatile Mounting: Includes a 1/2-inch NPT nipple for secure installation directly onto electrical junction boxes.
Common Questions
Can I use this relay with a 3-wire power-stealing thermostat?
Yes, the Resideo RC840T-277 is compatible with 3-wire systems and provides the 24V signal required for electronic thermostats to function correctly without additional power sources.
Is this unit rated for inductive loads like fans or motors?
While primarily used for resistive heating loads, this electromechanical relay is rated to handle inductive loads such as small fans or pumps, provided they do not exceed the amperage specifications at 277V.
What happens if the ambient temperature exceeds 140°F?
Exceeding the -4 to 140 degree temperature rating can lead to internal heat buildup and premature component failure. Ensure proper ventilation within the junction box during 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.
