24 Volt Power Adapter/Transformer,C-Wire Adapter Thermostat，Compatible with All Versions of Ring Doorbell and Thermostat for Ecobee,Sensi and Honeywell(25Ft Cable)
Condition: New
Buy Now, Pay Later
As low as
$3
/ mo
Learn more
- – 4-month term
- – No impact on credit to apply
- – Instant approval decision
- – Secure and straightforward checkout
Ready to go? Add this product to your cart and select a plan during checkout.
Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.
Learn more about financing & leasing here.
Free shipping on this product
30-day returns
Learn more
FREE 30-day refund/replacement
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
Availability:
In Stock.
Arrives
Sunday, Oct 25
Recently Viewed
Features
- HOME USE: Plug the transformer into your standard 120V outlets and converts to 24volt AC current.Please note that the c wire adapter is not compatible with the Nest learning 3rd generation
- SUPPORTED DEVICES: The 24v power adapter can not only power for popular smart thermostats such as for Honeywell, for Ecobee, for Emerson , for Sensi, but also can convert to 24 volt AC current for other devices that require 24v current for operation
- TECHNICAL SPECIFICATIONS: input voltage is 120 V AC, 60 Hz; Output voltage is 24 V, 300mA/AC,Directly tested with a multimeter is no-load voltage: AC26.6V-27.5V Note: The brand above is only for demonstrating compatibilityyy
- INSTALLATION :To prevent no power output, you must ensure that the terminals are stripped and securely clamp the screw terminals into the thermostat to maintain good contact,2pin non-polarity wires to ensure easy and error free installation for installers of all skill levels and knowledge bases,If your wiring is complicated, please ask a professional electrician for help
- EXTRA LONG CABLE: 7.6M (25ft) long cable enables you to install the cable along the wall and connect to the electrical outlet inside or outside.For Nest E connected this adapter to C and R pins (R also having the HVAC's Red line connected),For Nest Learning Thermostat,3rd generation connected adapter to the Cand RC pins
- For Nest learning 3rd generation. White wire to C, white/ grey striped wire to same (along with) the red wire to RC,For Nest E connected this adapter to the C and R pins (R also having the HVAC's Red line connected)
- For Nest learning 3rd generation Y1 (connected to the blue wire) / G (connected to the green wire) / RC (connected to the red wire and the power adapter grey and white wire, RC is to be connected to the 2 with the wire) W1 (connected to the white wire) C (connected to the power adapter white wire) must be satisfied with having the above wiring positions
Description
For Honeywell Smart WiFi Thermostats Ecobee Smart WiFi Thermostats Sensi Smart WiFi Thermostats Hive Smart WiFi Thermostats Our adapter is 7.6M (25ft) cord, long enough to reach your outlets Power adapters have passed fcc Certification, meet safety standard,safety and stability,you can use our products with confidence. Using power supply adapter for Honeywell Nest Ecobee Smart WiFi Thermostat. No more disappointing battery performance. Easy set-up for hassle-free connection. Just connect your Honeywell Nest Ecobee Smart WiFi Thermostat to a power outlet. Once you use it. You don’t have to take your WiFi Thermostat down to charge, won’t interrupt operation when you’re away. Our power adapter for WiFi Thermostats keeps your device constantly powered , and continuously operate without interruption. Connecting the power supply adapter to your Smart WiFi Thermostat takes just several minutes, don’t need an electrician. High standards of production environment and testing equipment. Strictly controlled product quality.
Brand: WUYELIN
Power Source: Corded Electric
Product Dimensions: 1.8"D x 2.3"W x 2.5"H
Mounting Type: Wall Mount
Specification Met: UL
Brand Name: WUYELIN
Model: MYT240300
Number of Items: 1
UPC: 791265645043
Manufacturer: WUYELIN
Unit Count: 1 Count
Part Number: 240030
Power Source: Corded Electric
Mounting Type: Wall Mount
Maximum Frequency: 60 hertz
Minimum Frequency: 60 hertz
Item Dimensions D x W x H: 1.8"D x 2.3"W x 2.5"H
Item Weight: 13.61 g
Specification Met: UL
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Sunday, Oct 25
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
- Klarna Financing
- Affirm Pay in 4
- Affirm Financing
- Afterpay Financing
- Zip Pay in 4
- Financing through Apple Pay
- Financing through Google Pay
Learn more about financing & leasing here.
Similar Products
$4/mo*
CircleCord NEMA 10-30P to 14-50R EV Charger Adapter Cord
$1/mo*
GE Outlet Extender, 3 Outlet Multi Plug Wall Power Splitter
Top Amazon Reviews
I bought this deliver constant power to my new Sensi Smart Thermostat. It was VERY easy to install - just cut the jumper wire between the RC and RH contacts on the Sensi and connect one of the wires of the transformer to the RC-contact and the other to the C-contact. Then plug in the transformer into the nearest AC outlet. No more loss of Wi-Fi connectivity! The transformer has a supper long wire in case the closet AC outlet is far away from the thermostat.
...
show more
Reviewed in the United States on January 16, 2026 by DanielJ
Super happy with this product. I didn’t have an existing C wire for hooking up my new Wi-Fi smart thermostat. I’ve been wanting one for a long time. It gets hot in my bedroom, and who wants to get out of bed and walk downstairs to adjust the thermostat when you’re trying to sleep? I wasn’t even aware I didn’t have one until I went to install the new thermostat. It’s my first experience wiring up a thermostat, so it was a great learning experience. The C wire is basically a 24v power supply for your newer thermostats. My home is pretty old, it originally had an old style thermostat with a mercury switch. This thing is easy to wire up, it has two wires, you can use either one to send power to the C input and the other one, for me, had to go into RC. Which I assume must be for grounding. The length of the cable was more than adequate for me. Getting the wire to my thermostat wasn’t easy. I have a hole in my wall, the wires run behind the wall and down into the basement where there’s a small hole in the floor boards. I can’t believe I pulled it off, but it actually worked and it didn’t even take long with some help from my daughter. I took some fishing line and connected a lead sinker to the end and poked that through the hole in the wall. It dropped down onto the floor and I had my daughter move it around until I could see it, and grab it with a set of very narrow needle nose pliers. Once I had it into the basement I wrapped up the C wires and zip tied them so the couldn’t come lose and pulled it back up through the wall. It actually worked. I ended up running the wires along the ceiling of my basement and plugging it into an outlet down there against the wall so it can’t accidentally get yanked out of the outlet. Now I can change the temperature of my thermostat without needing to get out of bed. This thing worked perfectly for me, I have only a small amount of experience wiring and I was able to get this done perfectly and safely. The price is fair. Saved the day for me.
...
show more
Reviewed in the United States on November 12, 2019 by Dave K
Worked perfect to provide a common wire to work with my ecobee thermosat. Easy to hook up and absolutely quiet. It stays cool to the touch and is unobtrusively white like an outlet cover.
Reviewed in the United States on February 23, 2026 by Inverse
The transformer supplied enough power for the Honeywell home thermostat. Too bad it was made In China.
Reviewed in the United States on December 22, 2025 by someone
Needed to upgrade old thermostat . Was looking for a thermostat that would work without a c-wire and be updated. Found a few that were a smart thermostat and didn’t possibly need a c wire. So ended up needing a c wire in order for the wifi signal to be able to work. This plug transformer served the purpose. I ended up feeding the wire up from the basement through the wall into the thermostat wall plate just like the old wires there. That help keep it clean , no wires showing. I plugged it in one of the light fixture that had an outlet. After that all was good and my thermostat was fully functional. No trouble as of 2 months . Quality seems well made , enough length in the wiring to have no issues reaching an outlet.
...
show more
Reviewed in the United States on January 21, 2026 by A. Rod
Very happy to use this to be able To power my Alexa thermostat as I lacked a c wire. I was saved from trying to run thermostat wire from The basement to the second floor.
Reviewed in the United States on August 26, 2026 by Ashish Verma
recently changed out my thermostats (7 thermostats at 3 properties) with the Honeywell wifi units. on all but 2 I was able to use existing wiring and get 24V into the back of the thermostats. at my older office building I was not, and with both air handlers in the attic I wasn't too excited about running a new conductor to the HW units. but both of those thermostats are on walls that have a closet on the opposite side, with a 110V outlet available. simply run the adapter wire thru the wall and into the back of the thermostats, in my case connect to the R and C terminals, plug it it and I'm good to go. I will run new low voltage wires next time I upgrade the AC units, but for now the adapter was a quick fix.
...
show more
Reviewed in the United States on January 13, 2025 by Craig D
This was the easiest and cheapest solution to address my c wire issue. I bought the Ecobbe4 and it needed obviously the C wire. Not a problem, the have an adapter and the instructions look easy enough and they have phone support as well. The problem was that the instructions assume you have a circuit board in your AC. Mine did not, I guess it was too old. So I had to trace the wires from the thermostat and found that they were all just spliced onto the AC wires. Not a problem. The problem became the issue of finding the 24 volt wire. With the help of ecobee support and them explaining how the wiring schematic worked it should have been the brown wire. But that wasnt holding a constant charge and the thermostat would just reboot everytime it tried to cut on the air. So I said forget it and put everything back to the way it was. I didnt want to spend $100 just for someone to come out and find 1 wire... so one day on Amazon I saw this power adapter. This was the perfect solution. I have an electrical outlet right below my thermostat. I drilled a hole through the inside back of the outlet to run the cable through to the AC closet, then ran the cable up, put another whole for the cable to go through the wall to the thermo stat. After a little trial and error I found that the negative cable goes on the RC and the positive goes to the C. Attached are some pics of the install and how i wired my ecobee. Hope this helps some of you.
...
show more
Reviewed in the United States on May 21, 2019 by basscow