--- product_id: 502116108 title: "16.5V 40VA Burglar Alarm Systems and Doorbell Transformer,16.5V Plug in Transformer Compatible with All Versions of Doorbell ，Most Security Panels" brand: "wuyelin" price: "VT1784" currency: VUV in_stock: false url: https://www.desertcart.vu/products/502116108-16-5v-40va-burglar-alarm-systems-and-doorbell-transformer-16 store_origin: VU region: Vanuatu --- # 16.5V output power LED power indicator 40VA high wattage capacity 16.5V 40VA Burglar Alarm Systems and Doorbell Transformer,16.5V Plug in Transformer Compatible with All Versions of Doorbell ，Most Security Panels **Brand:** wuyelin **Price:** VT1784 **Availability:** ❌ Out of Stock ## Summary > 🔐 Power your peace of mind with the transformer that never quits! ## Quick Answers - **What is this?** 16.5V 40VA Burglar Alarm Systems and Doorbell Transformer,16.5V Plug in Transformer Compatible with All Versions of Doorbell ，Most Security Panels by wuyelin - **How much does it cost?** VT1784 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/502116108-16-5v-40va-burglar-alarm-systems-and-doorbell-transformer-16) ## Best For - wuyelin enthusiasts ## Why This Product - Trusted wuyelin brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Built to Last:** Auto-resetting PTC fuse protects your system from overloads, keeping you worry-free. - • **Visual Power Status:** Green LED indicator lets you instantly confirm your transformer is working—no guesswork. - • **Plug & Play Simplicity:** Effortless installation with screw terminals—no electrician needed. - • **Power Up Your Security:** Reliable 16.5V output ensures your alarm and doorbell systems never underperform. - • **Universal Compatibility:** Works seamlessly with Honeywell, DSC, Nest, Skybell, and more—future-proof your setup. ## Overview This 16.5V 40VA plug-in transformer delivers stable, high-capacity power for all major burglar alarm and doorbell systems. Featuring an auto-resetting fuse and LED power indicator, it ensures safe, reliable operation while being easy to install and compatible with top brands like Honeywell, DSC, and Nest. ## Description Style:16.5V 40VA Burglar Alarm Systems and Doorbell TransformerCompatible model: Nest Hello Doorbell, Doorbells Video Doorbell, Video Doorbell Pro Video Doorbell 2 Burglar Alarm Systems Fits Most Alarm System Brands Specification: Input voltage: 120V AC, 60Hz Output load voltage: 16.5V AC±5% 40 VA Output No load voltage: 18.5V AC±5% Output with screw terminals，auto-resetting (PTC) fused ## Features - ➡︎ Easily Replace your Old Transformer - Plug in Alarm System Transformer for your Security System - ➡SPECIFICATION: input voltage: 120 VAC, 60Hz; Output voltage: 16.5V, 40VA SAFE AND STABLE auto-resetting (PTC) fused secondary, LED green power indicator - ➡ELIMINATATE DOORBELL UNDER POWER HASSEL:16.5V 40VA plug in transformer, replaces and upgrades underpowered transformer with this 16.5V AC transformer, offering plenty of power for your doorbells - ➡Compatible With: This transformer compatible for Honeywell Ademco, DSC, ETC Burglar Alarm Systems; Also compatible with Video Doorbell, Video Doorbell 2, Video Doorbell Pro, Nest Skybell Doorbell，Note: The brand above is only for demonstrating compatibilityyy - ➡ Easy to install:Output with screw terminals, simple wiring。The load voltage(when the doorbell is running) is 16.5V and the output of no-load voltage by a multimeter to test is about 18.5-19.5V, normal function and won’t affect any use.When testing the product, pay attention to use an AC voltmeter or a multimeter to test the output voltage value and use a voltage tester to measure the accurate voltage output data. ## Technical Specifications | Specification | Value | |---------------|-------| | Maximum frequency | 60 Hz | | Minimum frequency | 60 Hz | | Specification met | RoHS | | Item weight | 0.7 Kilograms | | UPC | 782942443762 | | Manufacturer | WUYELIN | | Product Dimensions | 9.65 x 6.35 x 5.33 cm; 700 g | | Wattage | 40 watts | | Item Package Quantity | 1 | | Plug format | B - US style with ground plug. | | Batteries included? | No | | Batteries Required? | No | | Item Weight | 700 g | ## Product Details - **Brand:** WUYELIN - **Power source:** AC - **Product dimensions:** 5.3D x 6.4W x 9.7H centimetres - **Mounting type:** Wall Mount - **Current rating:** 0.5 Amps ## Images ![16.5V 40VA Burglar Alarm Systems and Doorbell Transformer,16.5V Plug in Transformer Compatible with All Versions of Doorbell ，Most Security Panels - Image 1](https://m.media-amazon.com/images/I/61WGI9DdiXL.jpg) ![16.5V 40VA Burglar Alarm Systems and Doorbell Transformer,16.5V Plug in Transformer Compatible with All Versions of Doorbell ，Most Security Panels - Image 2](https://m.media-amazon.com/images/I/61nVo35InGL.jpg) ![16.5V 40VA Burglar Alarm Systems and Doorbell Transformer,16.5V Plug in Transformer Compatible with All Versions of Doorbell ，Most Security Panels - Image 3](https://m.media-amazon.com/images/I/51-oAhOw+1L.jpg) ![16.5V 40VA Burglar Alarm Systems and Doorbell Transformer,16.5V Plug in Transformer Compatible with All Versions of Doorbell ，Most Security Panels - Image 4](https://m.media-amazon.com/images/I/613D+l3uU9L.jpg) ![16.5V 40VA Burglar Alarm Systems and Doorbell Transformer,16.5V Plug in Transformer Compatible with All Versions of Doorbell ，Most Security Panels - Image 5](https://m.media-amazon.com/images/I/61PB-zT-XQL.jpg) ## Questions & Answers **Q: Why does the voltage drop to 6V when hot? It works fine for a few minutes then drop when it get hot and could not deliver enough voltage to charge.** A: The high temperature becomes hot, indicating that the PTC inside the transformer has started the temperature protection function. The transformer will not work again until the temperature cools down after the protection function is started Are you overloaded? **Q: Can this be used on a 16 volt system?** A: sure ,this transformer output is 16-16.5v 40va **Q: Can this be used to replace a 16 volt unit** A: I would check with the manufacture minimum voltage requirements. It may work, but with limited results. I would replace with the transformer that was installed with the system. **Q: Can i use this transformer to replace my existing honeywell 1321transformer 25va to power my vista20p panel and envisalink evl-4ezr?** A: Hello, The Honeywell 1321 supplies 16.5 VAC (Volts AC) just like this one. The Honeywell transformer can only supply 25 VA (volts times amps) whereas this transformer can supply 40 VA. That means that it has more capacity to spare compared to the Honeywell, so it will power the equipment just fine. Short answer: YES. :) ## Frequently Bought Together - 16.5V 40VA Burglar Alarm Systems and Doorbell Transformer,16.5V Plug in Transformer Compatible with All Versions of Doorbell ，Most Security Panels - ExpertPower EXP1250 12V 5Ah Home Alarm Battery with F1 Terminals --- ## 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.vu/products/502116108-16-5v-40va-burglar-alarm-systems-and-doorbell-transformer-16](https://www.desertcart.vu/products/502116108-16-5v-40va-burglar-alarm-systems-and-doorbell-transformer-16) --- *Product available on Desertcart Vanuatu* *Store origin: VU* *Last updated: 2026-05-07*