





This 24 V transformer fits for Nest, Ecobee, Honeywell and Sensi smart thermostats; Also compatible with Ring Video Doorbell, Ring Video Doorbell 2, Ring Video Doorbell Pro, Nest Skybell Doorbell, and other devices that require constant 24 volt power for operation BOJACK 24V/40VA Thermostat and Doorbell Transformer, Power Supply Compatible with Nest, Ecobee, Sensi and Honeywell Thermostat, Nest Hello Doorbell and All Versions of Ring Doorbell (4011MT)
Powers thermostats and doorbells: replace underpowered transformers
Easy to install: screw down and thread clamps to electrical box
This 24 volt transformer is UL-certified, offers reliable performance
Input is 120 VAC, 60 Hz; Output: 24 V/ 40 VA
This 24v transformer fits for Nest, Ecobee, Honeywell and Sensi smart thermostats; Also compatible with Ring Video Doorbell, Ring Video Doorbell 2, Ring Video Doorbell Pro, Nest Skybell Doorbell, and other devices that require constant 24 volt power for operation
Product Dimensions : 3.1 x 2.3 x 4.8 inches; 1.68 Pounds
Item model number : BJ-4011-24V
Date First Available : October 22, 2020
Manufacturer : BOJACK
ASIN : B08LNVXL2R
Best Sellers Rank: #17,340 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #18 in Door Bell Transformers
Customer Reviews: 4.6 4.6 out of 5 stars (480) var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
Powers thermostats and doorbells: replace underpowered transformers
Input :120 VAC, 60 Hz; Output: 24 V/ 40 VA
This 24 Volt transformer is UL-certified, offers reliable performance
Easy to install: screw down and thread clamps to electrical box
This 24 V transformer fits for Nest, Ecobee, Honeywell and Sensi smart thermostats; Also compatible with Ring Video Doorbell, Ring Video Doorbell 2, Ring Video Doorbell Pro, Nest Skybell Doorbell, and other devices that require constant 24 volt power for operation
12 reviews for BOJACK 24V 40VA Thermostat and Doorbell Transformer, Power Supply Compatible with Nest, Ecobee, Sensi and Honeywell Thermostat, Nest Hello Doorbell and All Versions of Ring Doorbell
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$19.99

fmwardalot –
Made my chimes work correctly with a doorbell camera.
I purchased a Doorbell camera, and could not get the chime to work with my existing transformer. I took a look at my transformer and it is only a 10VAC transformer. Works fine for conventional doorbell chime. I was curious if the 10 VAC was low for the camera. The camera works fine on the 10VAC transformer, but the chimes did not work.For kicks, decided to buy this transformer to see if it would make a difference. Sure enough…installed this transformer, and the chimes immediately started working with the mechanical chime adapter.The open circuit voltage on my original transformer was 16VAC, while this one is approximately 19.5 VAC (measured with a good Fluke DMM). As far as the transformer itself, it was perfect, three wires (black, white, green), mounting nut was provided. Seems well made, rivet is correctly pressed, laminated plates all look aligned, ground wire is installed between the body and the core. All good. installation took 10 minutes. An interesting observation is that they used Philips instead of slotted screws, but that’s not a dealbreaker.
Oz –
Works for Ring Pro.
I have two ring pro doorbells. The excess load caused my old transformer to blow. Installed this one and so far works perfectly.
LK –
Work as described, used it with ring doorbell
Work great. Have been in service for 6 months + with a ring doorbell
Chappell –
Transformer 24v
This item saved my air con and saved me a ton to install it myself
Rabby Tat –
Size matters.
This item works for the situation, but is very large. Our old transformer fit into a standard electrical box, but buyers should be aware that this one will not. I had to relocate to another place because it would not fit.
Keith Lee –
Great product
Great value for your money, easy wiring, and installed very easily works very well very small easy to hide when installed.
Brandon S –
Works perfectly!
Third times a charm! I ordered two of these USED, which both arrived DOA. Not BOJACK’s fault, those previously used parts don’t go back to them (just to Amazon who does not retest). Be cautious if trying to buy used or open box. For the fee bucks more, buy new and get a tested/working model.Also, fantastic and fast customer service!Bought this upgrade my 16v to 24v for Ring Doorbell. Necessary if you have voltage drop and trying to use mechanical chime.Thanks!
Quick signs –
Used for Google doorbell
I purchased the Google doorbell and The transformer that came with the house just didn’t have the juice to make everything workThis transformer is a beast and everything works great. I highly recommend it
al-nur pradhan –
worked perfectly
Eric S. –
Was getting an extra 1.8v without load, maybe that’s fine, maybe it’s not, but it working ok with my Ubiquiti G4 Doorbell camera – unfortunately I still can’t use a normal chime with it, since the doorbell has issues beyond the power delivery from the transformer, but that’s irrelevant to this review.
Matt –
I was having ecobee thermostat rebooting problem , this was used on a gas unit heater for a shop , I looked at existing transformer and it was only a 1200 milli amp which is 1.2 amp , not near enough for both to run properly , this replacement work great , so if you are having reboot problems look at the transformer you have it could be under size for both
Sal S –
Didn’t work we have three doorbells in the house so I think I needed a different system