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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.
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Availability:
In Stock.
Arrives
Friday, Oct 30
Recently Viewed
At a glance
- Condition
- New
- Number of Items
- 1
- Model
- Maxdot-Transformator-0491
- Dimensions
- 4.13"D x 3.94"W x 3.07"H
- Weight
- 1.6 lb
- Power Source
- Corded Electric
- Mounting Type
- Surface Mount
- In the box
- Doorbell Transformer
Features 5
- SpecificationsInput is 120 Volt, 60 HZ; Output: 24 Volt/ 40 VA; Tip: The load voltage (when the doorbell is running) is 24V and the output of no-load voltag is about 27V
- UL ListedThis doorbell transformer has passed the UL test, which greatly improves safety and longevity, as transformer without this certification have a higher risk of circuit induced fire house problems during operation
- CompatibilityThe transformer doorbell power supply compatible with Honeywell thermostat and doorbells, compatible with Nest, Ecobee, Sensi, Ring doorbell transformer
- Easy to InstallThe 24V doorbell transformer is easy to replace and install, and can be screwed, threaded, or threaded clamped to the electrical box, and we provide clear wiring diagrams for proper wiring
- Professional Customer ServiceMaxdot doorbell transformer focuses on high quality product and improving good customer service, if any doorbell transformer can't meet your expectation, please contact us and we will try our best to solve the problem; If the problem cannot be solved, you will be refunded or exchanged
Specs 16
| Brand | Maxdot |
|---|---|
| Power Source | Corded Electric |
| Product Dimensions | 4.13"D x 3.94"W x 3.07"H |
| Mounting Type | Surface Mount |
| Specification Met | UL |
| Brand Name | Maxdot |
| Model | Maxdot-Transformator-0491 |
| Number of Items | 1 |
| UPC | 797153595773 |
| Item Highlight | Safe UL Listed, Wired 24 Volt Door Bell Kit, Easy to Install |
| Manufacturer | Maxdot |
| Part Number | Maxdot-Termostato-0491 |
| Maximum Frequency | 60 hertz |
| Minimum Frequency | 60 hertz |
| Item Dimensions D x W x H | 4.13"D x 3.94"W x 3.07"H |
| Item Weight | 1.6 pounds |
No specs match.
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Friday, Oct 30
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.
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Top Amazon Reviews
Perfect for video doorbell.
Number of Items: 1
Works perfect for my new Eufy E340 doorbell. My original low voltage transformer couldn’t keep up with the demand of a feature robust smart doorbell. The battery would die every 5 to 7 days. I’ve had this hooked up for a month now and it keeps the doorbells built in battery fully charged.
Reviewed in the United States on August 25, 2026 by James W.
Just what I needed for ring doorbell
Number of Items: 1
I had a ring doorbell pro which worked fine with my old transformer and just recently upgraded to the ring doorbell pro 2 because it had more features I wanted. Once installed I noticed that it was not receiving enough voltage for all the features to work and the inside mechanical doorbell was not ringing. Did some research and found the common issue was the transformer. I found this product and installed as soon as I got it. Super easy to install (I’m not an electrician), and once installed the voltage warning I was receiving on the ring doorbell went away and now it shows in good health. All the features now work thanks to this transformer. Great experience with the purchase and like I said earlier, super easy to install. Thank you so much for your awesome product. Thanks to you my ring doorbell is now fully operational!!!
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Reviewed in the United States on August 28, 2023 by Ben
Much Needed Smart Device Upgrade
Number of Items: 1
Previous transformer was a 16v 10 VAC unit that came with my new home build. I had a Google Nest doorbell cam installed from day one and from the onset, it never quite worked 100% (i.e. - doorbell button had to be pushed and held for a good second or two to ring). Fast forward several years the Nest died and I replaced it with another brand. Right off the bat the unit was having issues working and would freeze up. After diagnosing and trying to eliminate the issues, I came across that the original home transformer may not be up to the task. Giving this unit a try so far has been positive as the doorbell has no issues and appears to be keeping the supplementary battery up to charge (one of the issues before).
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Reviewed in the United States on January 20, 2026 by M
OK while it lasts
Number of Items: 1
Bought this 11/2021 to power a single Nest Hello doorbell. It worked OK (I say OK because it always had a slight hum from day 1) until it finally crapped out 7/2022. I originally bought this specific brand and model because of the good reviews and because I was considering powering an additional Nest Hello doorbell at the back door, but it doesn't seem like this one has what it takes to handle even 1 for the long haul. Edit: I contacted the seller and inquired about warranty service due to having issues 7 months after purchase and they offered to send me a new one with no questions asked. Good customer service is worth a lot in my book because even the best products will fail from time to time, so I've upgraded my rating to 4 stars. I'll monitor the new one for a period of time and if it doesn't have a hum and continues putting out consistent VAC, I'll consider upgrading my rating to 5 stars because 1 faulty unit shouldn't represent the product as a whole when the seller jumps at the opportunity to make it right.
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Reviewed in the United States on July 19, 2022 by Joshua Barker
This is the one you need for your Ring.
Number of Items: 1
I recently installed the Maxdot Doorbell Transformer 24V 40VA to power my Ring Wired Video Doorbell, and I couldn’t be more satisfied with my choice. This transformer is not only compatible but also provides a stable 24V output, ensuring that my doorbell functions flawlessly. The installation process was straightforward, thanks to the clear instructions included in the package. I appreciated that all the necessary components were provided, which made setup a breeze even for someone who isn’t particularly handy. Within minutes, I had it connected and ready to go. One of the standout features of this transformer is its UL certification, which gives me peace of mind knowing that it meets safety standards. It operates quietly and efficiently, with no overheating issues so far, which is a huge plus for a device like this. Additionally, the build quality feels robust, and the sleek design allows it to blend in seamlessly with my home’s electrical setup. It’s been working perfectly, providing a reliable power source for my doorbell without any interruptions. Overall, I highly recommend the Maxdot Doorbell Transformer for anyone looking for a dependable and easy-to-install solution for their wired doorbell. It’s an excellent investment that delivers on performance and safety!
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Reviewed in the United States on October 25, 2024 by NayNay
DEAD.
Number of Items: 1
Ordered June 24 2026. Dead. Not sure when it died as the ring doorbell has a battery too. I did not do a voltage test on it after installing. Ring health said good. Voltage test after ring doorbell said offline. 0 voltage from transformer. Very disappointing as the return window is closed. Guessing it was DOA. First one I purchased in 2020 is still working.
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Reviewed in the United States on September 22, 2026 by Chas
Does the job it's designed to do.
Number of Items: 1
Worked perfectly to up the voltage for our new "Smart" doorbell (lights, cameras, action!). The body of the transformer gets warm to the touch, but not hot enough to cause combustion issues. The hookup was simple -- once I figured out it was necessary to completely bypass the ringer for the old doorbell.
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Reviewed in the United States on October 2, 2025 by KERRY C
Plenty Of Power With Headroom To Spare
Number of Items: 1
I own a house that was built in 1950 and I do know that the doorbell that was originally on the house was installed after the house was built. I do not know why who originally installed the original transformer and doorbell system in my house the way they did but the power going from the transformer to the front doorbell switch has to have at least 75 to 90 ft of wire ran from it. I recently upgraded my doorbell system to the Nest Hello doorbell and I honestly thought there would be enough power from the original transformer. It turns out there was not enough power and I had to get something that had a bit stronger output. I searched the web for suggestions on what transformer would be good to work with my Nest Hello doorbell and a link with directed to Amazon for this transformer. Installation was very easily done where this transformer comes with typical wiring. A hot, a neutral, and a ground wire. Wired up the transformer to the AC power that was in place and then wired up the doorbell to this transformer. I put a voltmeter on the connections and I was getting anywhere between 28.3 to 28.7 volts output. I go over to where my doorbell switch is located and I was getting about 25.5 volts. When all said and done this transformer absolutely met my needs to set up a modernized doorbell system in my house. The construction of this transformer is very sturdy and it looks like it's well built. I also like that it is UL listed and it gives me peace of mind that something like this is not going to go on fire and cause damage to my house. Overall I think this was a solid purchase and I would highly recommend.
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Reviewed in the United States on August 23, 2022 by DVJ Luna