Model # AT72-D1006

Internet #202312933

Store SKU #748782

null 24-Volt Transformer

24-Volt Transformer

$3988 /each
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Product Overview

The 24-Volt Transformer features override protection. This step-down transformer is designed to power almost any 24-Volt control system, including thermostats, gas valves and relays. Plate mounted with 9 in. lead wires.

  • Color-coded lead wires for primary connections
  • Meets NEMA standard DC20-1992
  • Meets NEC class 2 not wet, class 3 wet and UL 1585 requirements
  • Energy limiting
  • Note: product may vary by store

Info & Guides

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Product Depth (in.)
Product Height (in.)
Product Width (in.)


Accessory type
Boiler Replacement Part
Heating Product Type
Heating Technology Type
Product Weight (lb.)

Warranty / Certifications

Manufacturer Warranty

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Customer Questions & Answers

my oil furnaces will fire, up it runs but will not fire

it's getting oil but will not light is it the transformer
Asked by: topwop
It could be the transformer but it could be a number of other items evolved in the ignition sequence. A technician would normally isolate the different components evolved with the ignition cascade of events to isolate which component is not functioning appropriately. The transformer you reference in this question is a 24 volt transformer often used to power the control system. It is not an ignition transformer.
Answered by: chris
Date published: 2016-02-23

How do I check the WI FI 24V power?

I have a WI FI thermostat that has stopped working. I want to check the 24v power to be sure it is a problem with the thermostat, NOT the power. How do I do that?
Asked by: JJL
I would start by removing the thermostat. I would use a volt meter to confirm the presence of 24 volts. Keep in mind you may have 24 volts present but still not have enough volt amps to actuate the relays or switches that are down stream. My point is that I have run into systems where the transformer is week and although it is still producing 24 volts it is not enough power. Not knowing what type of system you have it is hard for me to give further advise. As I don't know it this is a furnace or boiler. Thus you are welcome to give me a call. Chris 978 651 3301
Answered by: chris
Date published: 2016-09-04

What is the amperage spec?

What is the listed maximum amperage 20VA, 40VA, aand 50VA are typical
Asked by: Jac1502
40VA...I would get the 75VA one for safety power reserve. Not available though at HD
Answered by: Paul
Date published: 2016-01-30

120 volt heater system 2 wire

I just ordered this 24 volt transformer my question whether or not this unit will work with a 120volt heater
Asked by: b61mack
Hello b61mack, I’m Chris from the Home Depot’s how-to Community. Thank you for your question. This part is just a simple step-down transformer used to convert 120 volts down to the 24 volts or so needed by thermostats, gas valves and relays. It is a common replacement part for household furnaces. If that is what you need it for then it should work out just fine. I hope this helps, Chris. .
Answered by: Chris
Date published: 2016-06-18
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