---
product_id: 254258171
title: "Royal Apex 24VAC 40VA Thermostat and Doorbell Transformer, Power Supply Compatible with Nest, Ecobee, Sensi and Honeywell Thermostat, Nest Hello Ring Doorbells | Made in Vietnam"
brand: "royal apex"
price: "$26.28"
currency: USD
in_stock: true
reviews_count: 8
category: "Royal Apex"
url: https://www.desertcart.us/products/254258171-royal-apex-24vac-40va-thermostat-and-doorbell-transformer-power-supply
store_origin: US
region: United States of America
---

# 24V AC, 40VA power output Universal compatibility with top smart thermostats & doorbells RU-certified safety & premium anti-rust materials Royal Apex 24VAC 40VA Thermostat and Doorbell Transformer, Power Supply Compatible with Nest, Ecobee, Sensi and Honeywell Thermostat, Nest Hello Ring Doorbells | Made in Vietnam

**Brand:** royal apex
**Price:** $26.28
**Availability:** ✅ In Stock

## Summary

> ⚡ Power your smart lifestyle with unmatched reliability!

## Quick Answers

- **What is this?** Royal Apex 24VAC 40VA Thermostat and Doorbell Transformer, Power Supply Compatible with Nest, Ecobee, Sensi and Honeywell Thermostat, Nest Hello Ring Doorbells | Made in Vietnam by royal apex
- **How much does it cost?** $26.28 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/254258171-royal-apex-24vac-40va-thermostat-and-doorbell-transformer-power-supply)

## Best For

- royal apex enthusiasts

## Why This Product

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

## Key Features

- • **Built to Last & Protect:** RU-certified with pure copper wiring, flame-retardant materials, and ESD protection for reliable, safe operation.
- • **Power Up Your Smart Home:** Robust 24V AC, 40VA output powers multiple thermostats & doorbells simultaneously without a hitch.
- • **Plug & Play Universal Fit:** Seamlessly compatible with Nest, Ecobee, Honeywell, Sensi thermostats and Ring, Nest Hello doorbells—no compatibility guesswork.
- • **Stable Voltage, Zero Downtime:** Delivers consistent 24VAC power ensuring your smart devices stay online and responsive 24/7.
- • **Upgrade Your Home’s Backbone:** Replace underpowered transformers and avoid device failures—because your smart home deserves premium power.

## Overview

The Royal Apex 24VAC 40VA Transformer is a high-quality, RU-certified power supply designed to reliably power multiple smart thermostats and doorbells simultaneously. Compatible with leading brands like Nest, Ecobee, Honeywell, and Ring, it features pure copper wiring, flame-retardant materials, and stable 24V AC output to ensure safe, consistent performance for your smart home ecosystem.

## Description

Power Up Multiple Thermostats / Doorbells: Replaces And Upgrades Underpowered Transformer With This 24V Ac Transformer, Offering Plenty Of Power For Single Or Multiple Thermostats And Doorbells At The Same Time Universal Compatibility: 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 Specification: Input Is 208-240 V/ Ac, 50/60 Hz; Output: 24 V/ 40 Va , Class 2 Transformer With Class B Insulation System Ru Certified And Safe Use: This 24 Volt Transformer Is Ru-Certified, Offers Reliable Performance Pure Copper, Anti Rust And Esd Protected : Use High-Quality Materials, High-Quality Silicon Steel Plate, All-Copper Enameled Wire, Nylon Flame-Retardant J Rubber Core, Flame-Retardant Tape, High-Temperature Resistance Lead And Vacuum Impregnation Varnish Treatment.

Review: Stable voltage for doorbells. - Good quality product. Stable 24VAC voltage. Size is bigger than my expectation and heavier too. But works well. I use it for Ring doorbell.
Review: Poor quality getting very hot even with no load - The transformer getting very hot and likely will damage soon due to excessive heat. Manufacturer used less number of coils turns to save money which is causing this issue. PS. Connected to 220v supply using the black and orange wires. It may blast and make a risk of fire. Not recommended….

## Features

- POWER UP MULTIPLE THERMOSTATS / DOORBELLS: replaces and upgrades underpowered transformer with this 24V AC transformer, offering plenty of power for single or multiple thermostats and doorbells at the same time
- UNIVERSAL COMPATIBILITY: 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
- SPECIFICATION: Input is 208-240 V/ AC, 50/60 Hz; Output: 24 V/ 40 VA , Class 2 Transformer with Class B Insulation System
- RU CERTIFIED AND SAFE USE: This 24 volt transformer is RU-certified, offers reliable performance
- PURE COPPER, ANTI RUST AND ESD PROTECTED : Use high-quality materials, high-quality silicon steel plate, all-copper enameled wire, nylon flame-retardant J rubber core, flame-retardant tape, high-temperature resistance lead and vacuum impregnation varnish treatment

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08P8NYPMK |
| ASIN  | B08P8NYPMK |
| Batteries Required? | No |
| Best Sellers Rank | #7,905 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #2 in Door Bell Transformers |
| Color | multi |
| Country of origin  | United Arab Emirates |
| Customer Reviews | 3.8 3.8 out of 5 stars (29) |
| Customer reviews | 3.8 3.8 out of 5 stars (29) |
| Date First Available | 28 November 2020 |
| Date First Available  | 28 November 2020 |
| Included components | TRANSFORMER |
| Item Package Quantity | 1 |
| Item Weight | 150 g |
| Item model number | RA-191-05860 |
| Item model number  | RA-191-05860 |
| Manufacturer | Royal Apex |
| Manufacturer  | Royal Apex |
| Package Dimensions | 9 x 7 x 5 cm; 150 g |
| Package Dimensions  | 9 x 7 x 5 cm; 150 g |
| Part number | RA-191-05860 |
| UPC | 704335537018 |

## Product Details

- **Brand:** Royal Apex
- **Item weight:** 150 Grams
- **Mounting type:** Wall Mount
- **Power source:** AC Adapter
- **Specification met:** RU

## Images

![Royal Apex 24VAC 40VA Thermostat and Doorbell Transformer, Power Supply Compatible with Nest, Ecobee, Sensi and Honeywell Thermostat, Nest Hello Ring Doorbells | Made in Vietnam - Image 1](https://m.media-amazon.com/images/I/61flQrqACbL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Stable voltage for doorbells.
*by S***J on 18 July 2021*

Good quality product. Stable 24VAC voltage. Size is bigger than my expectation and heavier too. But works well. I use it for Ring doorbell.

### ⭐ Poor quality getting very hot even with no load
*by W***M on 28 March 2024*

The transformer getting very hot and likely will damage soon due to excessive heat. Manufacturer used less number of coils turns to save money which is causing this issue. PS. Connected to 220v supply using the black and orange wires. It may blast and make a risk of fire. Not recommended….

### ⭐ It never worked
*by S***L on 27 September 2023*

Tried this Transformer for google doorbell. But it didn’t work

## Frequently Bought Together

- Royal Apex 24VAC 40VA Thermostat and Doorbell Transformer, Power Supply Compatible with Nest, Ecobee, Sensi and Honeywell Thermostat, Nest Hello Ring Doorbells | Made in Vietnam
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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-02-17*