





⚡ Power your doorbell with speed and safety—because every chime counts!
The NuTone C905 Door Chime Transformer delivers a consistent 16-volt, 10VA power supply compatible with most NuTone door chimes. Featuring a quick-install lock or wall mount that reduces setup time by 25%, it includes a thermal cut-off switch for overheating protection and is cULus safety certified. Available individually or in economical six-packs, it’s designed for durability, reliability, and hassle-free compliance.






| ASIN | B003FVU18W |
| Best Sellers Rank | #112,973 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #58 in Door Bell Transformers |
| Date First Available | November 25, 2012 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 0.01 ounces |
| Item model number | C905 |
| Manufacturer | Broan |
| Product Dimensions | 1.5 x 0.83 x 0.5 inches |
| UPC | 696731813660 026715024827 |
A**R
Works
Works for SimpliSafe Video Doorbell Pro and existing NuTone two-tone chime.
J**B
Works great, exact replacement of dead C905 transformer.
Had a dead doorbell transformer with identification of C905. Ordered this one and installed it. Ring doorbell works now. No problems.
A**O
Works great, just make sure it is for a matching doorbell
This works completely great and was used to replace a buzzing unit from the 70s. I would just ensure that you are connecting this to a Broan/NuTone doorbell and not get your hopes up on using this for smart doorbells
A**I
Fixed my doorbell issue
My doorbell stopped working one day and I eventually found that the issue was my transformer. Bought this and wired it up and now I have voltage again. Great value for the price.
M**J
Stopped working after a week
This is for the 16v 10va transformer. I know it is supposed to be 16v but after checking with a multimeter it shows 20v output. Everything seems to be fine. Doorbell worked fine for a week then stopped working. Save the trouble of doing the job again and look elsewhere.
T**E
Needs better packaging
Product works great,doorbell chime works again.Easy to install,but obviously not well packed,it's pretty hard to bend the tabs.Thankfully it mounted to wall plate.
B**.
Doorbell transformer
Direct replacement for my blown door bell transformer. I'm happy that the bell works again. Switching it is simple if you have basic electrical knowledge. Make sure you turn off your breaker to prevent getting zapped. You're going from standard 110v into the transformer and low voltage out.
M**L
Perfect replacement.
Easy replacement. What I can I say….it works like it should
R**E
Funciona para lo que se anuncia
S**R
Approximately $16 for a single doorbell transformer is terrible value for money. A kit with transformer, chime, and two buttons can be obtained for nearly the same price right here on amazon.ca The description says “6 pack” so I bought a “used” set. Received one transformer, and returned it. Assuming it was a “used” product error, I re-ordered a “new” 6-pack. Again I received one transformer. Back it goes. This is a waste of time and money for both amazon and myself. Hopefully amazon will update the description.
E**C
It doesnt hum and it knows the words ding Fong.
L**E
Works for my Wyze doorbell
F**.
Bon
TrustPilot
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