--- 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: "NT$4967" currency: TWD in_stock: true reviews_count: 13 category: "Rib" url: https://www.desertcart.tw/products/71152012-functional-devices-tr75va001-transformer-75-va-120-to-24-vac store_origin: TW region: Taiwan --- # 75 VA power capacity 120 to 24 VAC step-down Foot & single threaded hub mount Functional Devices TR75VA001 Transformer, 75 VA, 120 to 24 Vac, Circuit Breaker, Foot and Single Threaded Hub Mount **Brand:** rib **Price:** NT$4967 **Availability:** ✅ In Stock ## Summary > ⚡ Power your smart home with confidence — no electrician can outsmart this transformer! ## 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?** NT$4967 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/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 - • **Robust 75 VA Output:** Delivers reliable power for demanding smart home devices and multi-chime setups. - • **Made in the USA Quality:** Crafted domestically by Functional Devices, guaranteeing durability and compliance with UL standards. - • **Built-in Circuit Breaker:** Integrated safety feature protects your system from overloads and electrical faults. - • **Dual Mounting Flexibility:** Foot and single threaded hub mount options for seamless, secure installation anywhere. - • **Precision Voltage Conversion:** Effortlessly steps down 120 VAC to 24 VAC, ensuring optimal device performance. ## Overview The Functional Devices TR75VA001 is a 75 VA transformer that converts 120 VAC to 24 VAC, featuring a built-in circuit breaker and versatile mounting options (foot and single threaded hub). Made in the USA and UL certified, it’s engineered to provide consistent, reliable power for smart doorbells, multi-chime systems, and other low-voltage applications, ensuring professional-grade performance and safety. ## 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 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. Review: Works great - Needed it for my adt doorbell/address light/garage lanterns. Provides power very consistently. And very heavy and durable. ## Features - 75Va - 120 to 24 vac - Sold as each ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0115YLX78 | | Best Sellers Rank | #132,609 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #80 in Power Transformers | | Brand | RIB | | Brand Name | RIB | | Customer Reviews | 4.6 out of 5 stars 59 Reviews | | Item Weight | 3.53 Pounds | | Manufacturer | Functional Devices, Inc. | | Model | TR75VA001 | | Mounting Type | Foot Mount | Hub Mount | | Number of Items | 1 | | Part Number | TR75VA001 | | Power Source | Corded Electric | | Specification Met | UL | | Unit Count | 1.0 Count | ## 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 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. ### ⭐⭐⭐⭐⭐ 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 fine and has overload protector *by C***C on March 20, 2018* Had bad relay which caused previous transformer to burn out. This one just clicked and everything works fine after relay was replaced and breaker reset. If not for overload protection I would have to buy another transformer at that point. --- ## 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.tw/products/71152012-functional-devices-tr75va001-transformer-75-va-120-to-24-vac](https://www.desertcart.tw/products/71152012-functional-devices-tr75va001-transformer-75-va-120-to-24-vac) --- *Product available on Desertcart Taiwan* *Store origin: TW* *Last updated: 2026-10-16*