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VIIVRIA

VIIVRIA 24V 40VA Doorbell Transformer for Ring Pro/2 & Nest Hello

  • Based on 1,054 reviews
Condition: New
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Availability: In Stock.
Fulfilled by Amazon
Arrives Monday, Oct 26
Order within 6 hours and 17 minutes
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Features

  • Universal Compatibility: Certified for Ring Video Doorbell Pro/2, Nest Hello, Wyze, Eufy and most 16-24V smart doorbells. Includes dual-input terminals for thermostats and chime integration
  • Stable Voltage Output: Copper-core design maintains stable 24V output even under 40VA max load, eliminating low voltage warnings and supporting extended doorbell lifespan
  • Power Multiple Devices: Replace and upgrade underpowered transformers with this 24V AC Transformer, while providing ample power to single or multiple thermostats and doorbells. Works with any wired door chime
  • Easy Installation Process: The doorbell transformer is easy to replace and install with screws, unscrews or threaded clips to the electrical box in a safe location
  • Heavy-Duty Construction: Features a robust copper core design built for reliable, long-term performance in powering smart home devices that require constant 24 volt power for operation
  • Technical Specifications: Input is 120 VAC, 60 Hz with output of 24V/40VA, providing consistent power supply for thermostats, doorbells, and other compatible smart home devices

Description

VIIVRIA 24V Transformer is specifically designed to optimize the performance of Nest, Ecobee, Honeywell and Sensi smart thermostats; Also compatible with Ring, Eufy Video Doorbell, Ring Video Doorbell 2, Ring Video Doorbell Pro, Nest Skybell Doorbell, and other devices that require constant 24 volt power for operation 24V/40VA Thermostat and Doorbell Transformer, Power Supply Compatible with Nest, Ecobee, Sensi and Honeywell Thermostat, Nest Hello Doorbell and All Versions of Ring Doorbell (4011MT) Powers thermostats and doorbells: replace underpowered transformers Easy to install: screw down and thread clamps to electrical box Input is 120 VAC, 60 Hz; Output: 24 V/ 40 VA This 24v transformer fits for Nest, Ecobee, Honeywell and Sensi smart thermostats; Also compatible with Ring Video Doorbell, Ring Video Doorbell 2, Ring Video Doorbell Pro, Nest Skybell Doorbell, and other devices that require constant 24 volt power for operation. About VIIVRIA: VIIVRIA specializes in high-quality digital accessories, delivering reliable products for modern homes. We focus on providing durable solutions and exceptional customer service, ensuring satisfaction with every purchase.

Brand: VIIVRIA


Power Source: Corded Electric


Product Dimensions: 2"D x 2"W x 3"H


Mounting Type: Wall Mount


Current Rating: 0.5 A


Brand Name: VIIVRIA


Model: 130023-UD-CA


Number of Items: 1


UPC: 712317236668


Number of Packs: 1


Item Highlight: Heavy-Duty Copper Core; Hardwired Supply; Easy Install; Works with Thermostats & Chimes; Stable Output; Reliable Performance


Manufacturer: ZKRFID


Unit Count: 1 Count


Included Components: 24V 40VA Doorbell Transformer


Part Number: UD24-40VA


Power Source: Corded Electric


Mounting Type: Wall Mount


Current Rating: 0.5 A


Maximum Frequency: 60 hertz


Minimum Frequency: 60 hertz


Item Dimensions D x W x H: 2"D x 2"W x 3"H


Item Weight: 0.7 kg


Specification Met: UL


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Oct 26

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.

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Top Amazon Reviews

    • Build quality good, perfect for heating system thermostat or doorbell, excellent mounting options
This was a replacement for my multi-zone boiler. It came with everything needed for a professional install. The transformer can be mounted in a steel box with a 1/2 knockout hole or it has the option to mount it with the included 4 bolt pad. I chose a metal box with a cover that had a 1/2 knockout and simply installed the transformer to the plate and tightened with included nut which made for a great tool free install. They really should provide a pic of the optional mount on back side. Wiring is of decent quality a gauge and should provide many years of service. My system uses zone motors to control heat and it handles the load with ease. If you are looking to use this for doorbell solution it would handle the task easily. his was less than half the cost of the same rated unit at the big box stores and greater mounting options. With Amazons fast shipping I never left the house and saved time and fuel running to the stores. Would definitely recommend this transformer for any needs requiring the rated specs. ... show more
Reviewed in the United States on April 11, 2024 by Mike M
    • it worked for my video doorbell.
just as advertised
Reviewed in the United States on August 18, 2026 by PBarcola
    • Powerful!
We constructed a new home where the builders provided an underperforming transformer. The ring doorbell consistently suffered from weak power. We acquired this device, which is simple to install and supplies our doorbell with more power than required.
Reviewed in the United States on September 7, 2026 by The Hannon’s
    • Failed after a month.
Cheap, didn’t last very long. I bought this almost a year ago but didn’t install it until a month ago. I am not getting 24v on the secondary. Checked my 120v connections again, it was good. Just a cheap Chinese xfmr.
Reviewed in the United States on September 14, 2026 by Chimichanga
    • Great for Ring Pro
Knew that I had to install this to support my Ring Pro. I had a Ring 2 and decided to return it for the Pro after seeing my neighbor's Pro. Two things that never get cited about the Pro - Constantly Buffered video, so you always get a few extra seconds on the front of an event, and color video at night. These are HUGE benefits. With the Ring 2, I got quite a few instances of seeing a delivery man walk away from my house, instead of seeing them walk up. Color Night vision is also substantially better than the grainy black and white for recognizing facial features. The other benefits (look, custom motion zones, etc) are well documented. Now to the product. Install was easy, and I was replacing the smoke detector that the original was mounted next to and sharing the circuit with. The low voltage circuit also runs my thermostat, so I opted for the higher 24v 40VA model transformer. Turned off the circuit at the breaker, and rewired the new smoke detector and transformer at the same time. Standard three wire connection, just had to strip a little more wire to get it to wrap with the other wires I had. Once installed, I popped the breaker back on and checked voltage outside, it was about 27 volts. This is NORMAL for these things, don't be concerned that it says 24 on the package and is delivering more. That is done ON PURPOSE. a 16 volt will deliver about 18. The 40 VA amperage is key here. Ring recommends a MINIMUM of 16 v, 30 amp, but in reality their RECOMMENDED rating is 24 volt, 40 amp. Dig through their online support and you'll see evidence of this. Hooked everything up at the outside doorbell and inside the house at the mechanical doorbell, powered it up and was able to install after a few minutes to let the internal battery get some charge. In your Device Health, there is a Power rating that will say something like "Good". Click on Good and it will change to give you the milli-volt value. Per Ring, this should be between 3900 and 4300. Mine now consistently gets 4000-4050 with this transformer, and my thermostat is fine too. ... show more
Reviewed in the United States on December 30, 2019 by Kevin P
    • Works as expected
Took 3 days to fully charge my doorbell but it works as expected
Reviewed in the United States on October 6, 2026 by Tuan Le
    • Works as advertised.
Works exactly as advertised. Nest hello now fully functional.
Reviewed in the United States on July 30, 2026 by Jack T.
    • Ring Health excellence
Review Image by Carl T
Review Image by Carl T
Works great. Replaced 1st Generation Ring doorbell camera and found the old transformer extremely undersized for the Ring 2k plus features. Recommend that if you have an older home get a new transformer with the Ring.
Reviewed in the United States on September 20, 2026 by Carl T

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