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🔔 Power your smart entry with confidence and clarity!
The Maxdot 16V 30VA Doorbell Transformer delivers stable, UL-listed power tailored for Ring Wired Video Doorbells and other smart home devices. Its high-capacity output prevents video freezing and chime issues, while easy installation and broad compatibility make it the go-to upgrade for modern residences and commercial spaces.




| ASIN | B07GND8RMQ |
| Best Sellers Rank | #22,006 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #11 in Door Bell Transformers |
| Brand | Maxdot |
| Brand Name | Maxdot |
| Current Rating | 1.5 A |
| Customer Reviews | 4.5 out of 5 stars 8,611 Reviews |
| Global Trade Identification Number | 00797153595131 |
| Included Components | no |
| Item Dimensions D x W x H | 2.6"D x 2.4"W x 3.9"H |
| Item Type Name | Doorbell Transformer Compatible with Ring Video Doorbell Pro 16v 30va Hardwired Door Chime Transformer |
| Item Weight | 700 g |
| Manufacturer | Maxdot |
| Maximum Frequency | 60 hertz |
| Minimum Frequency | 1 hertz |
| Model | Maxdot T57-0052 |
| Mounting Type | Wall Mount |
| Number of Items | 1 |
| Part Number | T57-0052 |
| Power Source | Corded Electric |
| Product Dimensions | 2.6"D x 2.4"W x 3.9"H |
| Specification Met | UL |
| UPC | 797153595131 |
D**1
Use to better power house chime and a Ring Door Bell Pro
When I installed the RIng DoorBell Pro at my daughter's house I also replaced the house door mechanical chime with one (another mechanical one) on the Ring Compatibility list (many of which have different brand names but are made by Heath-Zenith and are low cost). The chime only cost me like $20 at Lowes. The old chime, even before the Ring Doorbell Pro barely rang. The old transformer was 16v 15 amp. The new chime rang fine and the Health of the Doorbell was fine. However I wanted a better transformer to avoid issues. This new one is 16V 30 amp. I bought another one for my house to replace a little 10 A one. The old one used the metal box as the ground, this new one has a plastic nut to attach it and a separate ground wire. So I used a short green grounding wire from Home Depot (Lowes sells ones that have a poorly designed screw that does not cut into box hole) to screw it into a hole in the box, cut off the other end and stripped it and connected it to the green ground wire on the transformer. The new House Door bell chime much louder with this transformer and seemed to happen faster. The chime itself requires a 10 amp transformer, so I have plenty for the RIng Doorbell Pro and the Chime. The transformer was super well packed and looks like a quality product. I also like the way the transformer has a cover over the transformer plates shielding it. The price was great too! It is UL approved and well documented. It has a internal thermal fuse (115 degrees)on the low voltage end. At night and when someone rings the bell more power is needed and this transformer is just the thing you want to avoid issues. Be aware, the electrical box where you old transformer is could have more than one live circuit running in it, so shutting off the power to the doorbell may leave a hot line inside yet. So know what you are doing. One tip is that you should cut the insulation to about 3/4-1" on the three transformer wires BEFORE you install it to provide enough room to wrap it around the wires and not totally depend on the plastic wire nuts to hold it. And remember you are talking about 120 V circuit here, so know what you are doing and shut off all breakers for all lines in the box and test there is no power inside before starting. FYI I have a circuit breaker box tracer and wireless power tester to aid me. If you don't know what you are doing get someone who does.
R**E
Didn't think it would work at first..
First let me say I bought this because my Ring Video Doorbell Pro video would freeze if someone rang the doorbell and I installed the voltage thingy that came with it and also disconnected the wires to the actual mechanical doorbell to save voltage for the video part of the system after noticing the poor performance and freezing video clips. I was initially disappointed. This is why. My old doorbell transformer had an output of 18.5 volts.. I installed this transformer and noted the voltage output was only 17.9.. thinking that this would be no better and maybe even worse than the last transformer. I was pleasantly surprised to find this actually worked to solve my freezing video problems!! Yay!! I have had my RVD Pro for a year now and it never really worked to its full potential until now. It always notified us of movements out front but always froze when the button was pushed. Now it's perfect. Installation time will vary for you and you should have some amount of electrical training. You should a multi-meter to measure your voltage to ensure you turn the correct breaker off and also measure the output if you are curious. You will also need a screwdriver to tighten the connections. I recommend marking the wires with a little tape and/or taking a pic of the original setup.. Also not sure if it matters +/- so I would measure the output to match the polarity (that may be dumb but I did it anyway). It took me about a 45 minutes because I broke a little wire (and didn't see the break) and had to figure out what the problem was. Great Purchase!!
T**N
Perfect upgrade to support the new Nest Doorbell
With Google Nest's recent forced migration to the new generation Nest Cams and Nest Doorbell, I installed the new doorbell only to realize the power requirements had gone up - I got the dreaded flashing white light on the doorbell. My existing Nutone 515T transformer was underpowered. In any case, it seemed like it barely had enough power to support the older generation Nest devices. Found this transformer based on a YouTube installation video recommendation. Ordered it with one-day delivery. Easy 1 for 1 installation (of course shut off the circuit breaker first and test for hot wires). Fortunately, the prior transformer was easy to locate in our closet near the doorbell ringer. If your house is older like ours, look for the circuit breaker for your thermostat or furnace. After installation, I got the desired blue light and setup initiation for my new Nest Doorbell. This also supports 2 Nest thermostats and a few other things - everything is working great. I have not found the transformer to be running hot - relatively cool to the touch (maybe ever so slightly warm).
S**Y
So far so good, so-rta...
Nothing fancy going on here. The install was simple, painless and quick as one would expect. The Ring Pro I bought this for fired up without issue and my previously underpowered mechanical doorbell was finally getting enough juice to complete a chime. After I completed the setup in the app everything was good, until it wasn't...maybe a glitch, but five minutes later I got a "poor" for the voltage rating. It was odd since everything was working....and then magically, it resolved itself another 5 minutes later and I haven't had any issues since -- everything is in the green. So maybe I can chalk that up to a Ring-related setup miscue where it was cycling through something as part of the install/setup? Regardless, everything appears to be working perfectly now. I get video almost instantly when I click on the live view (as opposed to having to wait awhile on the Arlo camera we used to use), and everything rings as it should (both the device and our mechanical doorbell). On a side note, as someone else mentioned, there is about a 3 second delay between pressing the Ring button and the mechanical chime actually ringing inside, but I don't believe that is a failure, I just think it has something to do with how the power is relayed. One final note...I had an electrician out for some other work and asked, out of curiosity, what he would charge for the Ring install (since he was already there). He told me that people always have power issues and there's a ton of troubleshooting involved and then quoted me $245. It's really not complicated at all and the instructions were pretty straightforward. He essentially wanted to charge the same amount it would cost to purchase the doorbell -- so there's that, trust in your own abilities for simple tasks like this -- it'll save you money. So overall this is a good purchase, I'm just worried slightly about the reliability given that initial glitch, but since there haven't been any further issues, I guess it's just a waiting game to see if this will hold up for years or crap out in a month.
K**T
This fit in the old school chime box and had more then enough power
This fit in the old school chime box and had enough power "Volts and amps" for the chime and about 75ft wire run to my RCA Door Bell (Same as Ring but no cloud). It had enough power for the 1st gen (no power boost box) and worked with the 2nd gen that came with the booster with out any problems. That said, the little FUSE they call a RESISTOR did pop when bench tested. This "resistor" is in fact a !! FUSE !! and if you test your system you MAY pop the fuse if no chime inline or short wires. If its working then stops check this fuse! The FUSE is needed for safety because of the some what thin wire gauge used for the mechanical chimes and LONG WIRE runs to the new Cam Door Bells. This transformer does have enough power too heat up the small wires if you have a dead short. This is what the fuse "they call it a resistor in the RCA Doorbell book" is needed for. After every thing was installed I tested some diff amp SLOW-BLOW fuses in line with my system till it could ring my chime with out blowing but WOULD blow if I held the door bell button down for more then 10sec.
R**.
worked to fix problems with door bell camera
easy to install. the transformed upgrade from 5/10v helped to resolve the intermittent internet connection with an amcrest doorbell.
A**Y
Great Customer Service After Initial Issue
Update 02/06/25 - I contacted their customer service and they were extremely helpful in solving the issue by issuing a replacement. Replacement is working great. Initial Review - I purchased this transformer to power our Blink doorbell/door cam. It worked fine for the first 2 years, however right after we crossed the two year mark, we received a low battery message from our Blink doorbell. I thought that was strange because it was supposed to keep the doorbell/camera working without using batteries but figured maybe the batteries were low on their own. I swapped batteries but then received another low battery notification a couple weeks later. I went to our crawlspace where I had installed the converter and confirmed that there was still AC power to the unit. I then checked the output terminals and measured that there was no voltage (DC voltage) across the two terminals. Something failed on the internals of the transformer that means it is no longer outputting the required (or any) voltage. The unit is in the crawlspace and hasn't been touched since it was installed and working successfully. Disappointing to see it fail after only 2 years. With no moving parts and no physical impact/use, it feels like it should last much, much longer. Now we're left trying to figure out what to do to replace it after only two years.
K**N
transformer output changes after a year
At first, it seemed just a glitch. Since the purchase date, the doorbell went off line multiple times. until yesterday. Symptom: The camera showed a blurred view. Then it went out completely. I tested the electricity; the power was coming into the transformer, but not getting out. No sign of burn. I disconnected all wires and tested the transformer alone. The output power of the transformer was 19.9 AV, instead of the rated 16 AV. I wonder why the camera took so long before shutting itself off. The transformer works, apparently, but not with the needed and rated voltage. My recommendation: confirm your device needs input, then test this transformer to make sure it has the needed or expected voltage. (PS- I did test this device before installing it for its output, as I returned multiple other transformers because of that, but after a year or so, it changed its output! not reliable.
J**H
Make sure you wire it up properly, read the instruction
This was easy to install, works great, had no problem wiring it up.
A**ー
おしゃれな玄関ベルに使用
取り付けは電気屋さんにお願いしましょう
J**Y
Good
Fast
大**昌
機能は期待通り
グーグルドアホンの電源に使いました。 もっと小さいと嬉しいな。
A**M
Sometimes gets hot when running 2 Ring Video Doorbell Pro’s
I’m using this transformer to run 2 Ring Video Doorbell Pro’s. I have one at the front door and one at the back door. I’ve had one disconnect at the back door and one disconnect at the front door so far and I believe that the transformer may be getting so hot at times it is tripping the internal thermal breaker inside the transformer itself and causing a disconnect to happen at the Ring Video Doorbell Pros. The transformer literature schematic shows it has an internal Thermal fuse F1 rated at 115 degrees which means if the transformer gets above 115 degrees the thermal fuse opens up and the transformer output voltage drops to 0 Vac until the transformer cools down and the thermal fuse resets. I may have to get a 16Vac 40VA transformer because I’m using 2 Ring Video Doorbell pro’s. I will see how my doorbells hold up and try and update my view as time goes on.
Trustpilot
1 month ago
2 weeks ago