--- 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: "€ 30.70" currency: EUR in_stock: true reviews_count: 9 category: "Royal Apex" url: https://www.desertcart.hr/products/254258171-royal-apex-24vac-40va-thermostat-and-doorbell-transformer-power-supply store_origin: HR region: Croatia --- # 40VA high power output Universal 24VAC compatibility RU-certified safety & durability 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:** € 30.70 **Availability:** ✅ In Stock ## Summary > ⚡ Power your smart lifestyle with confidence — never compromise on energy or safety! ## 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?** € 30.70 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/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 - • **Plug & Play with Top Brands:** Effortlessly compatible with Nest, Ecobee, Honeywell, Sensi, Ring, and more. - • **Built to Last, Built for Safety:** RU-certified with flame-retardant materials and pure copper wiring for reliable, safe operation. - • **Power Your Smart Home Seamlessly:** Robust 24VAC 40VA output powers multiple thermostats & doorbells without a hitch. - • **Engineered for the Modern Manager:** Compact wall-mount design with premium materials ensures a sleek, professional installation. - • **Upgrade Your Setup, Avoid Power Drops:** Say goodbye to underpowered transformers and enjoy stable voltage for all your smart devices. ## Overview The Royal Apex 24VAC 40VA Transformer is a high-performance, 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 a compact wall-mount design, ensuring safe, stable, and efficient operation 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: Check review before buying - The product does not work ## 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 | | Best Sellers Rank | #8,777 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #2 in Door Bell Transformers | | Brand | Royal Apex | | Brand Name | Royal Apex | | Country Of Origin | United Arab Emirates | | Customer Reviews | 3.7 out of 5 stars 30 Reviews | | Included Components | TRANSFORMER | | Item Weight | 150 Grams | | Item weight | 150 Grams | | Manufacturer | Royal Apex | | Maximum Frequency | 60 Hz | | Minimum Frequency | 50 Hz | | Model | RA-191-05860 | | Mounting Type | Wall Mount | | Mounting type | Wall Mount | | Number of Items | 1 | | Part Number | RA-191-05860 | | Power Source | AC Adapter | | Power source | AC Adapter | | Specification Met | RU | | Specification met | RU | | UPC | 704335537018 | | Unit Count | 1 Count | ## 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) ![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 2](https://m.media-amazon.com/images/I/61r3ECK6t+L.jpg) ![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 3](https://m.media-amazon.com/images/I/61rB0O26bGL.jpg) ![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 4](https://m.media-amazon.com/images/I/61esANelvnL.jpg) ![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 5](https://m.media-amazon.com/images/I/51zpBauviBL.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. ### ⭐ Check review before buying *by M***M on 1 May 2026* The product does not work ### ⭐ 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…. ## 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 - Eujgoov Power Transformer AC 220V to AC 12V 24V 10W 50Hz Single EI Power Transformer Power Converters(24V) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/254258171-royal-apex-24vac-40va-thermostat-and-doorbell-transformer-power-supply](https://www.desertcart.hr/products/254258171-royal-apex-24vac-40va-thermostat-and-doorbell-transformer-power-supply) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-08-07*