---
product_id: 179478623
title: "24 Volt Transformer, 40 VA AC Transformer Plug in with PTC Fuse Compatible with Ring Doorbell and Thermostat, Compatible with Nest, Ecobee, Sensi/Honeywell/ 24V Adapter (1 Pack)"
brand: "hotop"
price: "$68.42"
currency: USD
in_stock: true
reviews_count: 13
category: "Hotop"
url: https://www.desertcart.ec/products/179478623-24-volt-transformer-40-va-ac-transformer-plug-in-ptc
store_origin: EC
region: Ecuador
---

# 40VA power output Plug-in easy install PTC fuse safety 24 Volt Transformer, 40 VA AC Transformer Plug in with PTC Fuse Compatible with Ring Doorbell and Thermostat, Compatible with Nest, Ecobee, Sensi/Honeywell/ 24V Adapter (1 Pack)

**Brand:** hotop
**Price:** $68.42
**Availability:** ✅ In Stock

## Summary

> ⚡ Power your smart life with confidence and ease!

## Quick Answers

- **What is this?** 24 Volt Transformer, 40 VA AC Transformer Plug in with PTC Fuse Compatible with Ring Doorbell and Thermostat, Compatible with Nest, Ecobee, Sensi/Honeywell/ 24V Adapter (1 Pack) by hotop
- **How much does it cost?** $68.42 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ec](https://www.desertcart.ec/products/179478623-24-volt-transformer-40-va-ac-transformer-plug-in-ptc)

## Best For

- hotop enthusiasts

## Why This Product

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

## Key Features

- • **Visual Power Status:** Green LED indicator confirms your transformer is energized and ready to go.
- • **Safety First, Always:** Auto-resetting PTC fuse and UL certification ensure stable, worry-free operation.
- • **Plug & Play Simplicity:** Mounts easily on any outlet with a built-in tab—no complex wiring needed.
- • **Universal Compatibility:** Works seamlessly with top smart thermostats and doorbells for future-proof upgrades.
- • **Power Up Your Smart Home:** Reliable 24V 40VA output powers Ring, Nest, Ecobee & more without underpower hassles.

## Overview

This 24 Volt 40VA AC plug-in transformer delivers stable, UL-certified power for smart home devices like Ring doorbells and Nest thermostats. Featuring a PTC fuse for auto-reset protection, easy outlet mounting, and a green LED power indicator, it eliminates underpower issues and supports a wide range of 24V devices. Ideal for professionals upgrading home automation with reliable, plug-and-play power.

## Description

24 Volt Transformer, 40 VA AC Transformer Plug in with PTC Fuse Compatible with Ring Doorbell and Thermostat, Compatible with Nest, Ecobee, Sensi/Honeywell/ 24V Adapter (1 Pack) - desertcart.com

Review: Works as it should - Got this transformer to replace an older 16V transformer in my house as I needed up upgrade for a Tapo doorbell unit I received recently. I bought this transformer and a replacement 24V doorbell chime. This transformer seems to work well and performs as expected. Other reviews state that this transformer outputs higher than 24vac. Yes, that’s true but it’s on purpose. There is no regulation on these. It’s a straight step down transformer. The higher voltage will drop for two reasons. 1) current draw (load) and 2) cable run (length). Both of these things have a greater effect on voltage drop than a regulated power supply would have. People who are complaining about the higher voltage measured at the transformer clearly have no idea how this works. They just know enough to know how a DMM (voltmeter) works and that’s it. Additionally, most commercial circuits in medium to high end electronics have a tolerance for what the input voltage can be as well. Usually somewhere in the realm of +/- 10-15% of its highest input value. Moral of this story is, It’s perfectly safe to run this with a 24vac connected device. My credentials are I have a BS in manufacturing, and a PhD in Computer and electrical engineering.
Review: Works perfectly! - I purchased this for a ring doorbell. My mother didn’t want to set the wiring so we are using the existing wiring in the house already and needed something that would provide 24v output to the device. I tested the device first before plugging it in as my mother got her ring doorbell for free and I didn’t want to fry it. Red Lead on 0v and Black (power) on 24v. The readout was indeed AC, fluctuating from +24v to -24v with a max being +- 30v. The max the ring doorbell can take is 40v so that was great. I checked the connection of the wire for shorts and breaks (resistance) and everything was good. Set it up and it’s working fine. It’s perfect for my needs, though it is a bit bulky causing me to rearrange my plug but it is working and the ring doorbell is recognizing its connected to hardwire. My mother is happy and I got to use my Applied Integrated Technology degree. Win win.

## Features

- 【Warm Tips】Please read the installation instructions carefully before use (the middle terminal is connected to the ground wire) to avoid installation errors that may cause the product to become unusable
- Eliminate doorbell/ thermostat underpower hassle: 24V 40VA plug in transformer, replaces and upgrades underpowered transformer with this 24V AC transformer, offering plenty of power for your thermostats and doorbells
- Specification: input voltage: 120 VAC, 60Hz; Output voltage: 24V, 40VA; The power supply needs to be disconnected during the installation process; The resistor is not insulated; Please wear insulating gloves and other protective tools to avoid injury
- Safe and stable: auto resetting (PTC) fused secondary, LED green power indicator, positive/ negative/ screw terminals
- UL Certified and Easy Installation: electrical outlet mounting tab; Warm Tip: Only equip with plug in transformer, no wires included
- Universal compatibility: this 24v transformer is compatible with Ring video doorbell, Ring video doorbell 2, Ring video doorbell pro, Nest Skybell Doorbell, also compatible with Nest, Ecobee/Honeywell and Sensi Smart Thermostats, and other devices, that require constant 24 volt power for operation; Note: please add a 50W Watt 25 Ohm Resistor if you use this transformer to charge a doorbell, the brand above is only for demonstrating compatibility

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B083R621RV |
| Best Sellers Rank | #17,420 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #13 in Door Bell Transformers |
| Date First Available | January 11, 2020 |
| Item Weight | 1.61 pounds |
| Item model number | PS D40 |
| Manufacturer | Hotop |
| Product Dimensions | 2.13 x 2.56 x 3.94 inches |
| Specification Met | UL |
| UPC | 796168988969 |

## Product Details

- **Brand:** Hotop
- **Current Rating:** 1.5 Amps
- **Mounting Type:** Wall Mount
- **Power Source:** Corded Electric
- **Product Dimensions:** 2.13"D x 2.56"W x 3.94"H

## Images

![24 Volt Transformer, 40 VA AC Transformer Plug in with PTC Fuse Compatible with Ring Doorbell and Thermostat, Compatible with Nest, Ecobee, Sensi/Honeywell/ 24V Adapter (1 Pack) - Image 1](https://m.media-amazon.com/images/I/61YFD+Gn2UL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works as it should
*by D***Y on December 11, 2025*

Got this transformer to replace an older 16V transformer in my house as I needed up upgrade for a Tapo doorbell unit I received recently. I bought this transformer and a replacement 24V doorbell chime. This transformer seems to work well and performs as expected. Other reviews state that this transformer outputs higher than 24vac. Yes, that’s true but it’s on purpose. There is no regulation on these. It’s a straight step down transformer. The higher voltage will drop for two reasons. 1) current draw (load) and 2) cable run (length). Both of these things have a greater effect on voltage drop than a regulated power supply would have. People who are complaining about the higher voltage measured at the transformer clearly have no idea how this works. They just know enough to know how a DMM (voltmeter) works and that’s it. Additionally, most commercial circuits in medium to high end electronics have a tolerance for what the input voltage can be as well. Usually somewhere in the realm of +/- 10-15% of its highest input value. Moral of this story is, It’s perfectly safe to run this with a 24vac connected device. My credentials are I have a BS in manufacturing, and a PhD in Computer and electrical engineering.

### ⭐⭐⭐⭐⭐ Works perfectly!
*by K***S on August 20, 2023*

I purchased this for a ring doorbell. My mother didn’t want to set the wiring so we are using the existing wiring in the house already and needed something that would provide 24v output to the device. I tested the device first before plugging it in as my mother got her ring doorbell for free and I didn’t want to fry it. Red Lead on 0v and Black (power) on 24v. The readout was indeed AC, fluctuating from +24v to -24v with a max being +- 30v. The max the ring doorbell can take is 40v so that was great. I checked the connection of the wire for shorts and breaks (resistance) and everything was good. Set it up and it’s working fine. It’s perfect for my needs, though it is a bit bulky causing me to rearrange my plug but it is working and the ring doorbell is recognizing its connected to hardwire. My mother is happy and I got to use my Applied Integrated Technology degree. Win win.

### ⭐⭐⭐⭐⭐ Great Adapter
*by A***R on October 4, 2025*

So far, so good! Nice and clean and easy to use.

## Frequently Bought Together

- Hotop 1 Pack 24 Volt Transformer, 40 VA AC Transformer Plug in with PTC Fuse Competible with All Versions of Ring Doorbell and Thermostat, Compatible with Nest, Ecobee, Sensi, Honeywell, 24V Adapter
- Syston 18/2 Thermostat Doorbell HVAC Heating Control Cable Wire, 18 AWG 2 Conductors 100% Solid Copper Conductors CL3R/FT4/CMR Riser-Rated, UV Resistant RoHS for Low Voltage Applications Use
- Syston 18/4 Thermostat Doorbell HVAC Heating Control Cable Wire, 100% Solid Copper Conductors CL3R/FT4/CMR Riser-Rated UL/ETL Listed, UV Resistant RoHS for Indoor/Outdoor Low Voltage Applications Use

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*Product available on Desertcart Ecuador*
*Store origin: EC*
*Last updated: 2026-02-28*