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24-Volt AC 40VA Plug-in Doorbell Transformer, Compatible with Ring Wired Video Doorbell, Nest, Ecobee, Sensi, and Honeywell Thermostats, Power Supply for Multiple Smart Doorbells

  • Based on 84 reviews
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Availability: 20 left in stock
Fulfilled by Amazon

Arrives Tuesday, Sep 23
Order within 7 hours and 46 minutes
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Features

  • Compatible with Multiple Devices: This transformer is compatible with all versions of Ring Doorbell, including Video Doorbell 2, Video Doorbell Pro, and Nest Doorbell. It is also fully compatible with smart thermostats such as Honeywell, Nest, Ecobee, and Sensi, ensuring a wide range of smart home devices can be powered seamlessly
  • Unique Design with Enhanced Safety: Equipped with an auto-resetting (PTC) fused secondary, this transformer ensures a safe and stable power supply. The integrated LED green power indicator lets you know when the transformer is powered on. Input voltage: 120 VAC, 60Hz; Output voltage: 24V, 40VA; No-load output voltage: 26.6V. Additionally, the transformer features a built-in fixed screw, providing extra stability and easy mounting
  • Continuous Power Supply for Multiple Devices: This 24V AC 40VA plug-in transformer is designed to replace and upgrade underpowered transformers, ensuring a continuous and sufficient power supply for your smart thermostats and doorbells. With this transformer, you can say goodbye to frequent battery replacements, ensuring seamless operation for your devices
  • Easy to Install with Customizable Cabling: The output screw terminals allow for easy connection of cables, and you can freely cut and customize the connecting cable to your desired length. The plug includes a fixed screw on the head, making it easier to securely mount the transformer to the electrical box. This design provides extra stability and makes installation simple and hassle-free
  • VIIVRIA - A Brand You Can Trust: VIIVRIA has specialized in communication adapters for over a decade, earning a strong reputation in the North American market. Our focus on reliable and durable products ensures top performance for your smart home devices. If you have any questions or concerns, our dedicated customer service team is always here to assist you

Description

Hassle-Free Installation: With screw terminals and customizable wiring, the VIIVRIA 24V transformer allows for easy and efficient installation. Simply replace your old transformer, and this plug-in transformer will fit seamlessly with Ring Video Doorbells, Nest Doorbells, Nest Thermostats, Sensi Smart Thermostats, and other devices requiring a constant 24V power supply. The built-in fixed screw adds extra stability, ensuring a secure fit.< Safe and Stable Design: Equipped with an auto-resetting (PTC) fused secondary and an LED green power indicator, this transformer ensures safe and stable power.< It is designed to provide continuous, uninterrupted operation for your doorbells, thermostats, and security systems. The robust design makes it suitable for long-term, reliable use in residential or commercial settings. Compatible with: All Ring Video Doorbell versions< Ring Video Doorbell 2 Ring Video Doorbell Pro Nest Doorbell Nest Skybell Doorbell Honeywell Smart WiFi Thermostat Ecobee Thermostat Sensi Smart Thermostat< Google Nest Thermostat (1st/2nd Gen) Continuous Power for Multiple Devices: This 24V 40VA transformer provides ample power for multiple devices, ensuring your doorbells and thermostats work without interruptions. It's a perfect upgrade for replacing underpowered transformers, eliminating the hassle of frequent battery replacements. VIIVRIA - Trusted Quality for Over a Decade: VIIVRIA has been delivering high-quality digital accessories for over 10 years in the North American market. Our commitment to durability, reliability, and excellent customer service ensures that your smart home devices are always powered and running smoothly. If you have any questions, our team is always ready to assist.

Brand: VIIVRIA


Power Source: Plug in


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


Mounting Type: Chassis Mount


Current Rating: 1.67 Amps


Product Dimensions ‏ : ‎ 3 x 2 x 2 inches; 1.54 Pounds


Item model number ‏ : ‎ VII-AC24-40-P


Date First Available ‏ : ‎ August 12, 2024


Manufacturer ‏ : ‎ Uniond


Best Sellers Rank: #54,033 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #36 in Door Bell Transformers


#36 in Door Bell Transformers:


Customer Reviews: 4.4 4.4 out of 5 stars 84 ratings


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Tuesday, Sep 23

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


  • It works for Eufy Front Doorbell
Moved to a new place without a front door bell. I have my existing Eufy direct powered camera doorbell, and wanted to utilize, but they required 40 VA. A lot of the ready-made solutions could not supply that, so I tried this. It works fantastically. This is a well made product – – watch out it is rather hefty. ... show more
Reviewed in the United States on May 31, 2025 by UrbanPhx UrbanPhx

  • Simple item that saved me time and effort
Why did you pick this product vs others?: Great solution that saved me some wiring. Used to power a UV air purifier light in my A/C air handler.
Reviewed in the United States on June 24, 2025 by Rdeschain

  • It works as expected.
It works as expected.
Reviewed in the United States on June 21, 2025 by Trelane Esq

  • Easy install with correct and stable voltage
Perfect for my new wired gen 2 nest doorbell installation. I never had a doorbell on my home so I m doing a fresh installation and this transformer is what I chose to supply power to the video doorbell because of the center retaining screw and ground plug that it is constructed with as well as supplying the correct voltage/ amperage for the device. The back connections are labeled on the case of it and for the doorbell white to 0 and red to 24v is what turned the camera on with the ground wire not needed but available for future use if necessary. Being that the doorbell is always on I should get at least a year out of the transformer but only time will tell. ... show more
Reviewed in the United States on August 11, 2025 by M. Gibson

  • Perfect for HVAC UV Light
Great transformer! I used this one with a new HVAC UV light. Initially, I thought the light was 24v DC and bought the wrong power supply. Luckily, I found this one of 40VAC (2A) and it worked perfectly with my UV light 24VAC 1.1A
Reviewed in the United States on April 7, 2025 by Rafael M Koike

  • Solid made
Good power supply transformer
Reviewed in the United States on April 25, 2025 by Poroda

  • Almost impossible to figure out
I can't seem to figure out how to hook it up, there's no instructions, and the obvious way doesn't work. Probably just me but I can't get it to work at all for my ring doorbell.
Reviewed in the United States on February 3, 2025 by rich

  • 0 Volt tap label for Center Tap is misleading
Why have a terminal labeled 0 volts? This is a CT transformer ac to ac 24v. Two leads and a ground.
Reviewed in the United States on April 1, 2025 by clock

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