Elk TRG2440 24VAC, 40 VA AC Transformer with PTC Fuse

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Product Specifications

Input Voltage: 120 VAC, 60Hz, .43A, Output Voltage: 24 Volts A.C.
Auto-Resetting (PTC) Fused Secondary
Green Power On LED, Grounding Prong & Terminal
Electrical outlet mounting tab
H = 4.14-Inch, W=2.74-Inch, D = 2.2-Inch.

Product Description

Package Quantity:1 | Color:White Elk TRG2440 24VAC, 40 VA AC Transformer with PTC Fuse

Package Quantity:1 | Color:White TRG2440 Step Down Transformer, ELKTRANSFMRLIFE WTYLED 24/40VA, Elk Products,Inc. Category: Transformers, Power UPC Code: 762158124402 TRG2440 Step Down Transformer, ELKTRANSFMRLIFE WTYLED 24/40VA, Elk Products,Inc. Category: Transformers, Power UPC Code: 762158124402

Manufactured by: ELK

Product Reviews

Works as advertised

Used this to provide power to a thermostat. We didn’t have the C-wire in our home so I bought this to provide power, and following the mfr’s directions was able to use this to power the thermostat.

Good for powering C wire thermostats

I have been having issues with my HVAC system and was trying to diagnose the problem. My initial theory was that the transformer in my furnace was going out, so figured I would power my thermostat system externally using this transformer. We have a FocusPro system, where Equipment Interface Module is the one connected to your HVAC system. I measured the voltage from this device and it was a consistent 28.5V AC. I was definitely able to use this device to power my thermostat.One of the transformer AC pins goes to the C terminal on your thermostat, while the other one goes the the R terminal on your thermostat. You will probably need to join the R terminal wires, one from the HVAC system and one from the transformer into the R terminal of your thermostat.Good luck!

Works perfectly to add a Common wire for a Smart Thermostat

The HVAC in my house is comical in both age and implementation: the boiler dates to 1952, refuses to quit (knock on wood) and runs at 79% efficiency, and the A/C is 10 years old and has no terminal for a common wire. I finally decided to joint the modern era and wired up a smart thermostat that doesn’t do power stealing. Securing 50’ of ¹⁸⁄₂ wire I dropped it down the wall cavity the thermostat, ran the wire through the attic, and then dropped down into the basement where the old thermostat wires drop down. Hooked the two wires to the Rc (along with the A/C Rc wire) and the C wire, the other end to this transformer. Works perfectly.Only thing I would have done differently is use ¹⁸⁄₅ wire. Not that I need all five wires right now, but in the event I ever need the other 3 wires I could have saved myself a headache in the future (as is I now have 8 wires running to the thermostat). My bad. But the transformer works perfectly for this application!

Does what I need it to do!

This transformer was needed for my honeywell programmable WIFI thermostat. My furnace doesn’t have a ‘c’ wire - which is needed to power the unit. So I ran the wire down to the basement, dropped an outlet for it, and plugged it in. There is a set screw to keep this heavy unit plugged in securely.It does what I bought it for without problems.

Works great!

I used this to supply power to my Honeywell WiFi thermostat’s common wire. I had tried to power the thermostat from my Weil Mclain Boiler, but I could not get the wiring on the boiler-side to work. This worked on the first try, and can be used at any available outlet you can get to between where the thermostat is installed and where the furnace/boiler/AC control panel is accessible.On the transformer, I wired the yellow and blue wires to the two outside AC contacts. On the Honeywell WiFi thermostat I ran the yellow wire to the Rc contact and the blue to the C or Common contact.

Small connector opening on transformer…

This was the exact voltage and current rating to replace my old transformer; however, the connector openings are smaller due to the strain relief built into the transformer. Not sure if there were dimensions list only, but might want to verify before you purchase. Even in the assortment of electrical connectors I had, a standard spade connector did not work and had to be cut down to fit the narrow opening.Transformer is working perfectly and the LED light on the front makes it easier to verify the status. Nice warranty too.

Works great. Just what I needed!

I own an ecobee3 Smarter Wi-Fi Thermostat with Remote Sensor, 2nd Generation, Works with Alexa and at my previous apartment I was able to connect the unused blue wire to C and everything worked fine.Then we moved to Texas, and I tried the same thing and no dice. There were so many things wired into the blue “Common” wire AND I’m not familiar with how they do HVAC in the south (I’m from the North). Basically, I couldn’t get a reliable voltage, so I picked this up.Works perfectly, as it should. I do like the green LED on the unit letting me know it’s on.And if you have an ecobee (or similar) thermostat you’re using this with and are totally confused about where you should be connecting the transformer to here’s how I did it.Wires supplied from HVAC: Rh (Bridged over to Rc inside old thermostat), G, Y, WConnecting the transfer I did the following:1 wire from transformer to RcOther wire from transformer to CNothing connected to transformer GroundThe HVAC Red lead to Rhand the rest I connected to their proper colors.I also configured the ecobee to ignore Rh, and just use Rc, G, Y1, W1, and C. Works perfectly.

Excellent for powering your wifi thermostat

I bought this to power my CT30 Radio Thermostat, because we had no “C” wire running to the existing thermostat. This works perfectly. I’d initially tried using an extra transformer from another device, but despite the fact that the documentation claims you can use any AC or DC source from 12V to 24V, I found that anything less than ~18V did not work well, and for some reason made the touch display and WiFi connectivity very finicky. This transormer works perfectly, though. I also like the bare terminals, so I didn’t have to splice and solder any wires or rerun another wire to the thermostat – I was able to just cut the wire at the previous transformer I used and quickly attach them to the new one.

This is my 2nd purchase for this transformer and this …

This is my 2nd purchase for this transformer and this one seems to make a moderate buzzing noise. It is in a closet so no big deal but definitely would drive you crazy if not…

This worked great.

I needed a common wire for my internet thermostat. This worked great.

Very Good with Ecobee’s!

I was looking for a 24VAC to power our Ecobee thermostats. We have 3 zones and thus, 3 each thermostats.

Five Stars

Great product

Ring Pro Install

Works just like it should. No issues. I purchase this device to run my RING PRO doorbell. THIS IS THE DEVICE THAT GOT MY RING TO ACTUALLY WORK.

Five Stars

So far so good!

Good power supply

Well made easy to connect, good power supply

Four Stars

Works as advertised. Bought this to work with Ring doorbell.

Awesome, easy to use product for the Ring Doorbells

Awesome product! I bought this for my Ring Video Doorbell Pro. I couldn’t get any other scenario to work, including swapping out my existing 16V transformer for a 24V.