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Item #:
223220681
16.5V 40VA Door Bell Plug-in AC Transformer 40TR | AUTO-Resetting, Compatible with Ring Video Doorbell Pro, Wired Chimes, Nest, Sensi, DSC, Screw
Item #:
223220681
BSD 36
Price Details
Excluding Shipping & Custom charges ( Shipping and custom charges will be calculated on checkout )
*All items will import from US
In stock
Imported from USA store
QTY:
Order now and get it around Saturday, August 15
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Upgrade with Confidence: This UL-Listed 16.5V 40VA plug in transformer replaces and upgrades underpowered transformers, offering steady and reliable power to your doorbells and burglar alarm systems.
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What Stands Out
Auto Resetting
This transformer features an auto-resetting function that enhances safety, ensuring continuous power without manual intervention, effectively preventing overheating and potential damage.
Wide Compatibility
Compatible with popular devices like Ring Video Doorbell Pro and Nest, it seamlessly integrates with various smart home setups, making it versatile for multiple applications.
Safety Features
Equipped with a PTC fuse and screw terminals, this transformer ensures easy installation and reliable protection against short circuits, ensuring peace of mind for homeowners.
Product Details
- Upgrade with Confidence: This UL conform 16.5V 40VA plug in transformer replaces and upgrades underpowered transformers, offering steady and reliable power to your doorbells and burglar alarm systems
- Hassle-Free Installation: With screw terminals and simple wiring, you can easily replace your old transformer with this CentroPower transformer, which fits Honeywell and Sensi smart thermostats and other devices requiring constant 16.5V power
- Safe and Stable Design: Equipped with an auto-resetting (PTC) fused secondary and an LED green power indicator, this transformer provides safe and stable power, ensuring uninterrupted operation of your doorbells and burglar alarm systems
- Compatibility Guaranteed: This transformer is compatible with Honeywell Ademco, DSC, ETC burglar alarm systems, as well as Video Doorbell, Video Doorbell 2, Video Doorbell Pro, Nest Skybell Doorbell, and more. Note that the brands mentioned are only for demonstrating compatibility
- Accurate and Reliable Output: With no-load voltage testing of about 18.5-19.5V, you can use an AC voltmeter or multimeter to test the accurate voltage output data of this 16.5V 40VA plug in transformer, which won't affect its normal function
- Power Specifications: Features an input voltage of 120 VAC at 60Hz and delivers a consistent output of 16.5V at 40VA, providing reliable power for security systems, smart thermostats, and doorbell applications
- Easy Wiring Connection: Includes screw-down output terminals and thread clamps that simplify the installation process, allowing for secure and straightforward connection to your devices
| Brand Name | CENTROPOWER |
| Model | AC-16.5V |
| UPC | 759126327132 |
| Manufacturer | CENTRO |
| Part Number | CENTRO-240701 |
| Power Source | AC |
| Mounting Type | Wall Mount |
| Maximum Frequency | 60 Hz |
| Minimum Frequency | 60 Hz |
| Specification Met | UL |
| Brand | CENTROPOWER |
| Number of Items | 1 |
| Country of Origin | This item will be imported from US |
| What is in the box | 16.5V 40VA Door... For more details, please check description/product details |
| Item Weight | 1 lbs (450 grams) |
Who Should Buy?
-
Smart Home Users
Ideal for those who use compatible smart doorbells and devices enhancing home automation and security.
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DIY Enthusiasts
Perfect for individuals who enjoy installing their own doorbell systems and wired chimes easily.
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Safety-Conscious Consumers
Provides an AUTO-resetting feature and PTC fuse, ensuring a safety-first approach to electrical installations.
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High-Power Users
Not suitable for devices requiring higher voltage or wattage beyond this transformer's specifications.
Product Description
Have any Query? Chat with us
Customer Questions & Answers
-
Question:
What is the voltage and power rating of this transformer?
Answer: The transformer operates at 16.5V with a power rating of 40VA. This specification makes it suitable for various low-voltage applications, particularly for powering doorbells and security systems like Ring, Nest, and Sensi. The 40VA rating ensures efficient power supply for devices requiring stable voltage, thereby enhancing their performance. Using this transformer helps maintain the functionality and reliability of your home security setup. -
Question:
Is this transformer compatible with my existing doorbell?
Answer: Yes, this transformer is compatible with popular doorbell systems including Ring, Nest, and Sensi. Compatibility is crucial because using the right transformer ensures your doorbell functions optimally without risk of damage. For example, if you have a Ring doorbell installed, this transformer will provide the necessary power, ensuring that you receive clear notifications and access live video feeds without interruption. -
Question:
How do I install this transformer?
Answer: Installation of the transformer is straightforward, thanks to its screw terminal design. You simply connect the wires of your doorbell or security system to the corresponding terminals on the transformer. This makes the setup accessible even for DIY enthusiasts. Before installation, ensure you follow any provided instructions for safety standards, and remember to turn off power at the breaker to avoid any electrical hazards. -
Question:
What types of systems can I power with this transformer?
Answer: You can use this transformer to power doorbells and low-voltage security systems, such as Ring, Nest, and Sensi. These devices typically require a dedicated power supply, and the 16.5V output is ideal for keeping them operational. This transformer ensures that systems like video doorbells receive consistent power, which is essential for maintaining their functionality and performance during peak usage times. -
Question:
Can this transformer be used for outdoor installations?
Answer: While the transformer can power outdoor devices, it is crucial to ensure it is installed in a safe and dry environment. Typically, transformers are used indoors, and the connections should be shielded from moisture. For outdoor doorbells or security systems, consider locating the transformer in a sheltered area to protect it from weather-related damages while ensuring your devices remain fully functional. -
Question:
What is the significance of using a plug-in transformer?
Answer: A plug-in transformer simplifies installation as it does not require complex wiring or modifications to your existing electrical setup. This design allows you to easily switch it between outlets, facilitating flexibility in placement. For example, if you are moving your doorbell system, you can quickly relocate the transformer without the need for professional assistance. -
Question:
How safe is it to use this transformer?
Answer: This transformer is designed with safety in mind, featuring low voltage output which minimizes the risk of electric shock. Additionally, it typically includes built-in protection features to prevent overheating and short circuits. Users can feel secure knowing that they are using a transformer that meets safety standards for powering sensitive devices such as doorbells and cameras. -
Question:
How does this transformer help in maintaining my security system?
Answer: A reliable power supply from this transformer is essential for the uninterrupted operation of your security system. By providing a consistent 16.5V output, it ensures that your doorbell cameras operate effectively, allowing you to monitor your home continuously. This reliability is especially crucial when you are away from home, providing peace of mind regarding your security. -
Question:
Where can I buy the 16.5V 40VA AC Plug-in Transformer?
Answer: You can buy the 16.5V 40VA AC Plug-in Transformer for your doorbell and security system from Ubuy in The Bahamas. Ubuy offers a wide selection of electronic accessories, and this transformer is designed to be compatible with various smart home devices, ensuring you can easily find what you need to upgrade or install your security system.
CENTROPOWER Transformers Editorial Review
**** The doorbell transformer has received positive feedback from customers who value its effectiveness and compatibility with various doorbell camera systems. Users have noted that the product works as intended, providing a reliable power source that enhances the functionality of their doorbell setups. Installation is frequently highlighted as straightforward, making it an ideal choice for those looking for a direct replacement that doesn't require extensive technical knowledge. Many reviewers appreciate the aesthetically pleasing design of the transformer, which they feel is an improvement over existing models installed by contractors. However, some users did report that the transformer can become warm during operation, a common trait of such devices that indicates it is functioning normally. Compatibility issues were noted with certain setups, such as buzzing when connected to Google doorbells, suggesting that while the transformer works well for many users, others may experience specific challenges. Overall, this doorbell transformer is an affordable and effective solution for those needing to power their doorbell cameras, especially given its easy installation and broad compatibility with various systems. **
Customer Reviews & Ratings
152 customers ratings
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5 Star
82%
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4 Star
8%
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3 Star
6%
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Pros
- Effective and reliable performance
- Easy installation
- Aesthetically pleasing design
- Affordable and compatible with many doorbell cameras
Cons
- Can become warm during operation
Platform Trust & Buyer Confidence
MA
Mohammad
Verified buyer
“Excellent quality and original too,when ubuy send original things I will appreciate that ,I very satisfied thank you”
23 July 2026 · via Trustpilot
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Chitra
Verified buyer
“The order and delivery progress was communicated very well. Package arrived within the estimated time. Products arrived as expected in good condition.”
22-Jul-26 · via Trustpilot
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kund
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“Good supply of products. Safe payment methods, and shipment worldwide! Genuine products.”
23-Jul-26 · via Trustpilot
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Onesi
Verified buyer
“Was my first time buying a product from Ubuy, but I found it so helpful. This is reliable. Gonna place a new order!”
22 July 2026 · via Trustpilot
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SAO JOHN
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“Ubuy is a great online platform to buy stuff. Reliable, fast delivery time and great value for money. I've been using Ubuy online shopping platform for three years now and will continue to do so.”
23 July 2026 · via Trustpilot
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BSD 36
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Features & Benefits
- High voltage and over current protection for device safety.
- UL Listed for superior quality and reliability.
- Provides steady power to doorbells and smart thermostats.
- Easy installation with simple screw terminals.
- Compatible with major brands like Honeywell and Nest.
- Auto-resetting fuse ensures uninterrupted operation.
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