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FREE 30-day refund/replacement
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
To initiate a return, please visit our Returns Center.
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Availability:
In Stock.
Arrives
Tuesday, Sep 8
Recently Viewed
Number of Items: 1
Style: Without Screw Holes
Features
- Eliminate doorbell/ thermostat underpower hassle: 24V 40VA plug-in transformer replaces and upgrades underpowered transformer with this 24V AC transformer
- Specification: input voltage: 120 VAC, 60Hz; Output voltage: 24V, 40VA
- Safe and stable: auto-resetting (PTC) fused secondary, LED green power indicator, positive/ negative/ screw terminals
- Universal compatibility: this 24v transformer is compatible with Ring Video Doorbell, Ring Video Doorbell 2, Ring Video Doorbell Pro, Nest Skybell doorbell
- Also compatible with Nest, Ecobee, Honeywell, and Sensi smart thermostats, and other devices that require constant 24-volt power for operation;
Brand: Hotop
Power Source: Corded Electric,Plug
Product Dimensions: 2.13"D x 2.56"W x 3.94"H
Mounting Type: Wall Mount
Current Rating: 1.5 A
Brand Name: Hotop
Model: PS D40
Number of Items: 1
UPC: 796168988969
Number of Packs: 1
Manufacturer: Hotop
Unit Count: 1 Count
Part Number: PS D40
Power Source: Corded Electric,Plug
Mounting Type: Wall Mount
Current Rating: 1.5 A
Maximum Frequency: 60 hertz
Minimum Frequency: 60 hertz
Item Dimensions D x W x H: 2.13"D x 2.56"W x 3.94"H
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Tuesday, Sep 8
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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- Zip Pay in 4
- Financing through Apple Pay
- Financing through Google Pay
Learn more about financing & leasing here.
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Top Amazon Reviews
Number of Items: 1
Style: Without Screw Holes
Works perfectly to power my Tapo doorbell.
Reviewed in the United States on August 10, 2026 by N. Mollring
Number of Items: 1
Style: Without Screw Holes
Used this for my REME Halo RGF whole home purifier. Works great. Just had to buy the correct wire terminals (most of us probably already have them) & added some electrical tape for “SaFeTy” so somebody didn’t complete the circuit removing the plug from the outlet.
Reviewed in the United States on July 12, 2026 by Zayne
Number of Items: 2
Style: Without Screw Holes
Works with ring doorbell and ecobee thermostat. Plugs into electrical wall outlets.
Reviewed in the United States on August 8, 2026 by Army DIY
Number of Items: 1
Style: Without Screw Holes
Its working so far for my outdoor post lamp. This transformer does get very warm. I have it in my garage. I added an off/on ac 24v switch. I'm thinking of removing the switch to prevent overheating. For some reason this transformer is causing my led light to become dimmer. They were brighter from the previous transformer that died.
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Reviewed in the United States on July 25, 2026 by Jean
Number of Items: 1
Style: Without Screw Holes
Got this transformer to replace an older 16V transformer in my house as I needed up upgrade for a Tapo doorbell unit I received recently. I bought this transformer and a replacement 24V doorbell chime. This transformer seems to work well and performs as expected. Other reviews state that this transformer outputs higher than 24vac. Yes, that’s true but it’s on purpose. There is no regulation on these. It’s a straight step down transformer. The higher voltage will drop for two reasons. 1) current draw (load) and 2) cable run (length). Both of these things have a greater effect on voltage drop than a regulated power supply would have. People who are complaining about the higher voltage measured at the transformer clearly have no idea how this works. They just know enough to know how a DMM (voltmeter) works and that’s it. Additionally, most commercial circuits in medium to high end electronics have a tolerance for what the input voltage can be as well. Usually somewhere in the realm of +/- 10-15% of its highest input value. Moral of this story is, It’s perfectly safe to run this with a 24vac connected device. My credentials are I have a BS in manufacturing, and a PhD in Computer and electrical engineering.
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Reviewed in the United States on December 11, 2025 by D Wxby
Number of Items: 1
Style: Without Screw Holes
Efectivamente funcionó para doorbell eufy e 340.
Reviewed in the United States on July 8, 2026 by Ricardo Ceron
Number of Items: 1
Style: Without Screw Holes
very good quality
Reviewed in the United States on July 8, 2026 by William Ram
Number of Items: 1
Style: Without Screw Holes
It comes without wiring info, had to rely on photos on AMZ page. I had a new Ring, so I temporarily wired it with a short piece of new wire just to test everything. First thing I noticed is when I bent a “J” onto the wires to connect , the terminal screws are so close to the indent its all but impossible to get the wire around the screws. Plugged in and pilot light on so all good, except Ring said it didn’t have power The thing is very heavy ( which means it probably gets warmer after awhile ) yet the housing has no ventilation. Doesn’t seem like a long term solution. Lastly, the cover came half off when I unplugged it - gently . Didn’t bother wasting more time getting multimeter to test output. Returned it.
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Reviewed in the United States on September 24, 2024 by 9 yards