Resideo AT120A1004 Transformer
The Resideo AT120A1004 is a versatile, high-reliability 20VA foot-mount transformer engineered for integration into 24V control circuits. This multi-tap power source supports 120V, 208V, and 240V primary input configurations, providing a stable 27V secondary output at 60Hz. Designed for the rigors of field service, the AT120A1004 offers multiple mounting options, including foot-mounting or plate-mounting on standard 2x4 or 4x4 outlet boxes. With integrated 9-inch color-coded lead wires, identifying multi-tap transformer wiring for HVAC systems is straightforward, ensuring rapid installation and reduced downtime. This unit serves as a robust 24 volt transformer replacement for residential and light commercial furnaces, boilers, and air conditioning systems where precise voltage output is critical for sensitive electronics.
- Universal Voltage Compatibility: Supports 120, 208, and 240 VAC primary inputs for maximum field flexibility.
- Flexible Installation: Options for foot, plate, or outlet box mounting (2"x4" or 4"x4") accommodate tight chassis spaces.
- Industrial Build Quality: UL listed and designed to meet NEMA Class 2 standards for safety and performance in HVAC control circuits.
- Ready to Wire: Pre-stripped 9-inch leads simplify connections to standard terminal blocks and wire nuts.
Common Questions
Can I use the AT120A1004 to replace a 40VA transformer?
No, this unit is rated for 20VA. If your control circuit load—including contractors, relays, and smart thermostats—exceeds 20VA, you must use a higher-rated model to prevent overheating and premature failure.
Which wires do I use for a 208V application?
When wiring for 208V, use the specific color-coded leads as indicated on the wiring diagram labels; always cap any unused primary leads with wire nuts to prevent electrical shorts.
Is this transformer compatible with Nest or Ecobee thermostats?
Yes, provided the total VA draw of the thermostat and the HVAC equipment stays within the 20VA limit, the 27V secondary output is ideal for powering modern C-wire thermostat requirements.
This item is not eligible for free shipping.
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: $31.33
-65%$31.33
$10.97Resideo AT120A1004 Transformer
The Resideo AT120A1004 is a versatile, high-reliability 20VA foot-mount transformer engineered for integration into 24V control circuits. This multi-tap power source supports 120V, 208V, and 240V primary input configurations, providing a stable 27V secondary output at 60Hz. Designed for the rigors of field service, the AT120A1004 offers multiple mounting options, including foot-mounting or plate-mounting on standard 2x4 or 4x4 outlet boxes. With integrated 9-inch color-coded lead wires, identifying multi-tap transformer wiring for HVAC systems is straightforward, ensuring rapid installation and reduced downtime. This unit serves as a robust 24 volt transformer replacement for residential and light commercial furnaces, boilers, and air conditioning systems where precise voltage output is critical for sensitive electronics.
- Universal Voltage Compatibility: Supports 120, 208, and 240 VAC primary inputs for maximum field flexibility.
- Flexible Installation: Options for foot, plate, or outlet box mounting (2"x4" or 4"x4") accommodate tight chassis spaces.
- Industrial Build Quality: UL listed and designed to meet NEMA Class 2 standards for safety and performance in HVAC control circuits.
- Ready to Wire: Pre-stripped 9-inch leads simplify connections to standard terminal blocks and wire nuts.
Common Questions
Can I use the AT120A1004 to replace a 40VA transformer?
No, this unit is rated for 20VA. If your control circuit load—including contractors, relays, and smart thermostats—exceeds 20VA, you must use a higher-rated model to prevent overheating and premature failure.
Which wires do I use for a 208V application?
When wiring for 208V, use the specific color-coded leads as indicated on the wiring diagram labels; always cap any unused primary leads with wire nuts to prevent electrical shorts.
Is this transformer compatible with Nest or Ecobee thermostats?
Yes, provided the total VA draw of the thermostat and the HVAC equipment stays within the 20VA limit, the 27V secondary output is ideal for powering modern C-wire thermostat requirements.
This item is not eligible for free shipping.
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 AT120A1004 is a versatile, high-reliability 20VA foot-mount transformer engineered for integration into 24V control circuits. This multi-tap power source supports 120V, 208V, and 240V primary input configurations, providing a stable 27V secondary output at 60Hz. Designed for the rigors of field service, the AT120A1004 offers multiple mounting options, including foot-mounting or plate-mounting on standard 2x4 or 4x4 outlet boxes. With integrated 9-inch color-coded lead wires, identifying multi-tap transformer wiring for HVAC systems is straightforward, ensuring rapid installation and reduced downtime. This unit serves as a robust 24 volt transformer replacement for residential and light commercial furnaces, boilers, and air conditioning systems where precise voltage output is critical for sensitive electronics.
- Universal Voltage Compatibility: Supports 120, 208, and 240 VAC primary inputs for maximum field flexibility.
- Flexible Installation: Options for foot, plate, or outlet box mounting (2"x4" or 4"x4") accommodate tight chassis spaces.
- Industrial Build Quality: UL listed and designed to meet NEMA Class 2 standards for safety and performance in HVAC control circuits.
- Ready to Wire: Pre-stripped 9-inch leads simplify connections to standard terminal blocks and wire nuts.
Common Questions
Can I use the AT120A1004 to replace a 40VA transformer?
No, this unit is rated for 20VA. If your control circuit load—including contractors, relays, and smart thermostats—exceeds 20VA, you must use a higher-rated model to prevent overheating and premature failure.
Which wires do I use for a 208V application?
When wiring for 208V, use the specific color-coded leads as indicated on the wiring diagram labels; always cap any unused primary leads with wire nuts to prevent electrical shorts.
Is this transformer compatible with Nest or Ecobee thermostats?
Yes, provided the total VA draw of the thermostat and the HVAC equipment stays within the 20VA limit, the 27V secondary output is ideal for powering modern C-wire thermostat requirements.
This item is not eligible for free shipping.
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.
