---
product_id: 71152012
title: "Functional Devices TR75VA001 Transformer, 75 VA, 120 to 24 Vac, Circuit Breaker, Foot and Single Threaded Hub Mount"
brand: "rib"
price: "HK$962"
currency: HKD
in_stock: true
reviews_count: 13
category: "Rib"
url: https://www.desertcart.hk/products/71152012-functional-devices-tr75va001-transformer-75-va-120-to-24-vac
store_origin: HK
region: Hong Kong
---

# 75 VA power capacity 120 to 24 VAC step-down voltage Built-in circuit breaker protection Functional Devices TR75VA001 Transformer, 75 VA, 120 to 24 Vac, Circuit Breaker, Foot and Single Threaded Hub Mount

**Brand:** rib
**Price:** HK$962
**Availability:** ✅ In Stock

## Summary

> ⚡ Power your smart home with confidence and style!

## Quick Answers

- **What is this?** Functional Devices TR75VA001 Transformer, 75 VA, 120 to 24 Vac, Circuit Breaker, Foot and Single Threaded Hub Mount by rib
- **How much does it cost?** HK$962 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/71152012-functional-devices-tr75va001-transformer-75-va-120-to-24-vac)

## Best For

- rib enthusiasts

## Why This Product

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

## Key Features

- • **Proudly Made in the USA:** Crafted with quality and reliability you can trust, supporting local manufacturing excellence.
- • **Integrated Circuit Breaker:** Protects your devices and wiring from overloads, ensuring long-term durability and safety.
- • **Versatile Mounting Options:** Includes foot and single threaded hub mounts for easy, secure installation in any setup.
- • **Precision Voltage Step-Down:** Converts standard 120 VAC to a safe 24 VAC, perfect for modern doorbells and lighting systems.
- • **Reliable 75 VA Power Output:** Delivers consistent, ample power for demanding smart home devices and multi-chime setups.

## Overview

The Functional Devices TR75VA001 is a robust 75 VA transformer that steps down 120 VAC to 24 VAC, featuring a built-in circuit breaker and versatile mounting options. Engineered in the USA, it ensures reliable, safe power delivery for smart doorbells, lighting, and multi-chime systems, making it the go-to upgrade for professionals and savvy homeowners alike.

## Description

Functional Devices TR75VA001 transformer, 75VA, 120 to 24 VAC, circuit breaker, foot and single threaded hub mount. Made in United States. Manufactured by Functional Devices, Inc.

Review: Works great - Needed it for my adt doorbell/address light/garage lanterns. Provides power very consistently. And very heavy and durable.
Review: Works perfectly and exposed the ignorance of two licensed electricians. - I bought one of the Ring Pro video doorbells. I read the instruction manual and saw that it required a 40(?)VA transformer to power it I looked at our existing doorbell transformer and it was only 20VA. This explained why our existing doorbells worked rather sporadically. Since we have two chimes (one per floor) I figured it would be safer to get a transformer with a higher VA rating. This unit is the one I ended up ordering. Now, I'll admit that I know a fair amount about electricity and electronics. That's why I bought the part which would need to be upgraded for the doorbell to actually work. In fact, I considered this install a no-brainer that I likely could have done in my sleep. But I'm also very busy, so I figured a licensed electrician could save me time by doing the installation for me. Well, the company actually sent over two electricians. When they arrived, I handed them the doorbell and the replacement transformer then directed them to where the chimes and transformer were located. I was about to go back to my office/workshop when the electrician asked me what the transformer was for. I told him he would have to replace the one in the garage because it only put out half the power required by the video doorbell. He snorted and gave a sideways glance to his partner then said we aren't going to need this. I shrugged and went back to my office. Over an hour later, my wife came and said they had been trying/failing to get the doorbell to work for an hour and wanted to talk to me. I came in and they started telling me there must be something wrong with the doorbell and that they weren't going to be able to finish the install. I looked him in the eye and asked if he had installed the transformer I gave him when he walked in. He got an irritated look on his face and said, "no, but it won't matter." I just looked at him and said if you expect to be paid, go install that transformer right now. Then, I opened my iPad and checked the software installation they supposedly finished earlier. It was wrong. I fixed it by the time they came back from the garage mumbling their discontent between themselves. I walked out the front door. Saw the diode they were supposed to have removed, yanked it off, then pressed the doorbell button. It worked perfectly and sounded the chimes on both floors perfectly. They were a lot more humble when they left. One even asked me why that transformer was needed in the first place. I guess he was zoned out when I explained it earlier. So, not only was this a great transformer that solved a problem installing the Ring Pro (which is hardwired without batteries) but it served to school a couple of pompous electricians who apparently didn't understand what a Volt/Amp is or why it's important to provide enough to cover the needs of your device. If you are having trouble with a Ring Pro, you might want to try this transformer. It worked perfectly and had plenty of power to spare for feeding our two sets of normal door chimes.

## Features

- 75Va
- 120 to 24 vac
- Sold as each

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0115YLX78 |
| Best Sellers Rank | #119,849 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #71 in Power Transformers |
| Date First Available | June 13, 2017 |
| Item Weight | 3.53 pounds |
| Item model number | TR75VA001 |
| Manufacturer | Functional Devices, Inc. |
| Package Dimensions | 5.59 x 3.54 x 2.95 inches |

## Product Details

- **Brand:** RIB
- **Item Weight:** 3.53 Pounds
- **Mounting Type:** Foot Mount | Hub Mount
- **Power Source:** Corded Electric
- **Specification Met:** UL

## Images

![Functional Devices TR75VA001 Transformer, 75 VA, 120 to 24 Vac, Circuit Breaker, Foot and Single Threaded Hub Mount - Image 1](https://m.media-amazon.com/images/I/71-S5GMBeWL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works great
*by N***K on November 5, 2025*

Needed it for my adt doorbell/address light/garage lanterns. Provides power very consistently. And very heavy and durable.

### ⭐⭐⭐⭐⭐ Works perfectly and exposed the ignorance of two licensed electricians.
*by B***. on August 13, 2018*

I bought one of the Ring Pro video doorbells. I read the instruction manual and saw that it required a 40(?)VA transformer to power it I looked at our existing doorbell transformer and it was only 20VA. This explained why our existing doorbells worked rather sporadically. Since we have two chimes (one per floor) I figured it would be safer to get a transformer with a higher VA rating. This unit is the one I ended up ordering. Now, I'll admit that I know a fair amount about electricity and electronics. That's why I bought the part which would need to be upgraded for the doorbell to actually work. In fact, I considered this install a no-brainer that I likely could have done in my sleep. But I'm also very busy, so I figured a licensed electrician could save me time by doing the installation for me. Well, the company actually sent over two electricians. When they arrived, I handed them the doorbell and the replacement transformer then directed them to where the chimes and transformer were located. I was about to go back to my office/workshop when the electrician asked me what the transformer was for. I told him he would have to replace the one in the garage because it only put out half the power required by the video doorbell. He snorted and gave a sideways glance to his partner then said we aren't going to need this. I shrugged and went back to my office. Over an hour later, my wife came and said they had been trying/failing to get the doorbell to work for an hour and wanted to talk to me. I came in and they started telling me there must be something wrong with the doorbell and that they weren't going to be able to finish the install. I looked him in the eye and asked if he had installed the transformer I gave him when he walked in. He got an irritated look on his face and said, "no, but it won't matter." I just looked at him and said if you expect to be paid, go install that transformer right now. Then, I opened my iPad and checked the software installation they supposedly finished earlier. It was wrong. I fixed it by the time they came back from the garage mumbling their discontent between themselves. I walked out the front door. Saw the diode they were supposed to have removed, yanked it off, then pressed the doorbell button. It worked perfectly and sounded the chimes on both floors perfectly. They were a lot more humble when they left. One even asked me why that transformer was needed in the first place. I guess he was zoned out when I explained it earlier. So, not only was this a great transformer that solved a problem installing the Ring Pro (which is hardwired without batteries) but it served to school a couple of pompous electricians who apparently didn't understand what a Volt/Amp is or why it's important to provide enough to cover the needs of your device. If you are having trouble with a Ring Pro, you might want to try this transformer. It worked perfectly and had plenty of power to spare for feeding our two sets of normal door chimes.

### ⭐⭐⭐⭐⭐ Easy install, the power I needed.
*by Z***Y on April 14, 2019*

I run a Ecobee4 thermostat, and three Ring video doorbell Pros off this device. That's why I had to upgrade my transformer, the original unit would run the doorbells and one camera fine, but when the time came that I added additional cameras and upgraded my thermostat I needed something that would offer more power and higher voltage. I wasn't sure if I would still need additional room to grow but this unit offered all the power I needed now and then a bit to spare and was a good price. I have had it installed for a long while now and have never experienced any problems with it. All of the cameras and the thermostat have been solid.

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*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-03-04*