---
product_id: 312620230
title: "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"
brand: "bojack"
price: "162.94 DT"
currency: TND
in_stock: true
reviews_count: 12
category: "Bojack"
url: https://www.desertcart.tn/products/312620230-24v-40va-thermostat-and-doorbell-transformer-power-supply-compatible-nest
store_origin: TN
region: Tunisia
---

# 24V / 40VA output power UL-certified reliable performance Easy screw-down & thread clamp install 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

**Brand:** bojack
**Price:** 162.94 DT
**Availability:** ✅ In Stock

## Summary

> ⚡ Power your smart life with confidence and ease!

## Quick Answers

- **What is this?** 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 by bojack
- **How much does it cost?** 162.94 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/312620230-24v-40va-thermostat-and-doorbell-transformer-power-supply-compatible-nest)

## Best For

- bojack enthusiasts

## Why This Product

- Trusted bojack brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Compact & Discreet:** Small footprint (3.1 x 2.3 x 4.8 inches) fits neatly behind your electrical box, keeping your space sleek and clutter-free.
- • **Plug & Play Simplicity:** Screw-down and thread clamp design ensures a hassle-free installation in under 10 minutes—no electrician needed.
- • **Certified Peace of Mind:** UL certification guarantees safety and consistent performance, so your smart devices never miss a beat.
- • **Universal Compatibility:** Seamlessly supports all versions of Ring Video Doorbells, Nest Hello, and popular smart thermostats—future-proof your setup.
- • **Power Up Your Smart Home:** Delivers a robust 24V/40VA output to keep your Nest, Ecobee, Honeywell, Sensi thermostats and Ring doorbells running flawlessly.

## Overview

The BOJACK 24V 40VA Thermostat and Doorbell Transformer is a UL-certified power supply designed to replace underpowered transformers for smart thermostats and video doorbells. Compatible with Nest, Ecobee, Honeywell, Sensi thermostats, and all Ring doorbell versions, it delivers reliable 24V/40VA output with easy screw-down installation, ensuring your smart home devices operate smoothly and efficiently.

## Description

This 24 V 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 BOJACK 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 This 24 volt transformer is UL-certified, offers reliable performance 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

Review: Great product - Great value for your money, easy wiring, and installed very easily works very well very small easy to hide when installed.
Review: Made my chimes work correctly with a doorbell camera. - I purchased a Doorbell camera, and could not get the chime to work with my existing transformer. I took a look at my transformer and it is only a 10VAC transformer. Works fine for conventional doorbell chime. I was curious if the 10 VAC was low for the camera. The camera works fine on the 10VAC transformer, but the chimes did not work. For kicks, decided to buy this transformer to see if it would make a difference. Sure enough...installed this transformer, and the chimes immediately started working with the mechanical chime adapter. The open circuit voltage on my original transformer was 16VAC, while this one is approximately 19.5 VAC (measured with a good Fluke DMM). As far as the transformer itself, it was perfect, three wires (black, white, green), mounting nut was provided. Seems well made, rivet is correctly pressed, laminated plates all look aligned, ground wire is installed between the body and the core. All good. installation took 10 minutes. An interesting observation is that they used Philips instead of slotted screws, but that's not a dealbreaker.

## Features

- Powers thermostats and doorbells: replace underpowered transformers
- Input :120 VAC, 60 Hz; Output: 24 V/ 40 VA
- This 24 Volt transformer is UL-certified, offers reliable performance
- Easy to install: screw down and thread clamps to electrical box
- This 24 V 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

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08LNVXL2R |
| Best Sellers Rank | #14,650 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #13 in Door Bell Transformers |
| Date First Available | October 22, 2020 |
| Item Weight | 1.68 pounds |
| Item model number | BJ-4011-24V |
| Manufacturer | BOJACK |
| Product Dimensions | 3.1 x 2.3 x 4.8 inches |
| UPC | 762917165295 |

## Product Details

- **Brand:** BOJACK
- **Item Weight:** 0.76 Kilograms
- **Mounting Type:** Surface Mount
- **Power Source:** Corded Electric
- **Product Dimensions:** 3.1"D x 2.3"W x 4.8"H

## Images

![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 - Image 1](https://m.media-amazon.com/images/I/71boIA1wnyL.jpg)

## Questions & Answers

**Q: how long is the wire ? thank you .**
A: I am not sure of the length of this wire. But i can tell you this. it is more then 6" and not more then 12"

**Q: What is the maximum distance it can reach?**
A: Hard to give an answer as it depends on the current being drawn and how much voltage drop your device can tolerate.

**Q: Should this provide enough current to pull in up to three single-pole 120V contactors with 24VAC coils? I want to use this in a pool automation panel.**
A: It will supply 1.7 amps at 24 VAC.  You will need to determine the current draw of the contactors you want to use.  You also need to know what the inrush current is.  That is the amount of current needed to initially close the contactors.  Also, you usually should not exceed 80% of the current rating of your transformer.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great product
*by K***E on December 25, 2025*

Great value for your money, easy wiring, and installed very easily works very well very small easy to hide when installed.

### ⭐⭐⭐⭐⭐ Made my chimes work correctly with a doorbell camera.
*by F***T on March 22, 2025*

I purchased a Doorbell camera, and could not get the chime to work with my existing transformer. I took a look at my transformer and it is only a 10VAC transformer. Works fine for conventional doorbell chime. I was curious if the 10 VAC was low for the camera. The camera works fine on the 10VAC transformer, but the chimes did not work. For kicks, decided to buy this transformer to see if it would make a difference. Sure enough...installed this transformer, and the chimes immediately started working with the mechanical chime adapter. The open circuit voltage on my original transformer was 16VAC, while this one is approximately 19.5 VAC (measured with a good Fluke DMM). As far as the transformer itself, it was perfect, three wires (black, white, green), mounting nut was provided. Seems well made, rivet is correctly pressed, laminated plates all look aligned, ground wire is installed between the body and the core. All good. installation took 10 minutes. An interesting observation is that they used Philips instead of slotted screws, but that's not a dealbreaker.

### ⭐⭐⭐⭐⭐ Works for Ring Pro.
*by O***Z on November 9, 2025*

I have two ring pro doorbells. The excess load caused my old transformer to blow. Installed this one and so far works perfectly.

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-01-24*