Internet #310269229

Model # 40TR

0726843013594

Wired 24V 40vA Doorbell Transformer for Powering Multiple Smart Doorbells and Thermostats

  • 24V 40vA transformer for powering multiple door chimes
  • Use for devices that require constant 24V power for operation
  • UL Certified class 2 transformer for doorbell chime
$ 18 84

Frequently Bought Together

Frequently Bought Together

Product Overview

  • 24V 40vA transformer for powering multiple door chimes
  • Use for devices that require constant 24V power for operation
  • UL Certified class 2 transformer for doorbell chime
Specifications: input voltage: 120 V AC, 60 hz, output voltage: 24 V AC at 40 VA, dimensions: 2 x 2.5 x 2.5 inch universal powering for multiple doorbell chimes, smart video doorbells and thermostatic devices in one home. Replace the old and under powered doorbell transformers for better performance. Compatible with Ring Pro and ring doorbells, WiFi and other smart thermostats like Nest and ecobee and more. Not compatible with ring chime pro. UL Certified to guarantee safety and quality.Safe and easy install I on. WARNING: This product may expose you to chemicals known to the State of California to cause cancer or reproductive harm
  • 24VAC/40VA doorbell transformer for powering single or multiple doorbells and thermostats
  • Thermal cut-off switch offers an extra layer of safety, shutting off power in the event of excessive temperature, UL certified
  • Quick and easy installation: simply mount to electrical box via threaded connector or screw down
  • Eliminate issues caused by underpowered transformers: a lack of power, connection issues, low quality video resolution and low chime volume may be an indicator of an underpowered transformer
  • Compatible with ring video doorbell Pro, nest hello, nest thermostats, Zmodo smart greet Wi-Fi doorbell, sky bell doorbell and more, brands mentioned for compatibility information only
  • Input voltage: 120 Vac, 60Hz output voltage: 24 Vac at 40VA
  • Backed by a 2 year manufacturer warranty

Product Overview

  • 24V 40vA transformer for powering multiple door chimes
  • Use for devices that require constant 24V power for operation
  • UL Certified class 2 transformer for doorbell chime
Model #: 40TR
Internet #: 310269229

Specifications: input voltage: 120 V AC, 60 hz, output voltage: 24 V AC at 40 VA, dimensions: 2 x 2.5 x 2.5 inch universal powering for multiple doorbell chimes, smart video doorbells and thermostatic devices in one home. Replace the old and under powered doorbell transformers for better performance. Compatible with Ring Pro and ring doorbells, WiFi and other smart thermostats like Nest and ecobee and more. Not compatible with ring chime pro. UL Certified to guarantee safety and quality.Safe and easy install I on. WARNING: This product may expose you to chemicals known to the State of California to cause cancer or reproductive harm

  • 24VAC/40VA doorbell transformer for powering single or multiple doorbells and thermostats
  • Thermal cut-off switch offers an extra layer of safety, shutting off power in the event of excessive temperature, UL certified
  • Quick and easy installation: simply mount to electrical box via threaded connector or screw down
  • Eliminate issues caused by underpowered transformers: a lack of power, connection issues, low quality video resolution and low chime volume may be an indicator of an underpowered transformer
  • Compatible with ring video doorbell Pro, nest hello, nest thermostats, Zmodo smart greet Wi-Fi doorbell, sky bell doorbell and more, brands mentioned for compatibility information only
  • Input voltage: 120 Vac, 60Hz output voltage: 24 Vac at 40VA
  • Backed by a 2 year manufacturer warranty

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Ratings (50) (110) (56) (551)
Voltage 24 volt No Voltage No Voltage 24 volt
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Specifications

Dimensions

Product Depth (in.)
2 in
Product Height (in.)
2.5 in
Product Width (in.)
2.5 in

Details

Accessory Type
Transformer
Electrical Product Type
Door Bell Accessory
Included
Cables
Product Weight (lb.)
1.57 lb
Returnable
180-Day
Voltage
24 volt

Warranty / Certifications

Manufacturer Warranty
2 year limited warranty

Specifications

Dimensions

Product Depth (in.)
2 in
Product Height (in.)
2.5 in
Product Width (in.)
2.5 in

Details

Accessory Type
Transformer
Electrical Product Type
Door Bell Accessory
Included
Cables
Product Weight (lb.)
1.57 lb
Returnable
180-Day
Voltage
24 volt

Warranty / Certifications

Manufacturer Warranty
2 year limited warranty

Questions & Answers

I currently have a 16-volt 10vA transformer for the doorbell (not sure if it powers the thermosta...

I currently have a 16-volt 10vA transformer for the doorbell (not sure if it powers the thermostat as well), the doorbell is a Ring. I recently installed a new Honeywell T9 thermostat (with a common wire) and the Ring shows the doorbell is underpowered. I don't recall it saying that before the new thermostat (though it could have and I didn't notice). Should I replace the transformer with a 16-volt 30vA or use the 24-volt 40vA transformer? Can the wiring be OVER powered, is the question?
Asked by: DenSanAZ
Without a bell, my $99 RING says it requires a 25 ohm 50W !! resistor. Call the voltage 25 VAC to simplify the math. You have a 16 VAC Drop bell. Installing a 24V transformer COULD spurge your old school bell coil solenoid. To be safe, you would need this Digikey,com resistor, FVTS10-7.5-ND, or get one from Mouser. 25V - 16 = 8 VAC. 50W is lawyer overkill. You need essentially one ohm per volt times 8 VAC. That's 8 ohms. 8.25 ohms will do just fine to keep the cost reasonable at about $3-$4. 15 watts is plenty of heat dissipation for a very short duty cycle while pushing the old school bell button, for example. The calculated wattage (really VAs) is 8 "watts". 15 W is fine. Install an ~8 ohm resistor in series with your old bell. You should be safe from surging your old bell. You could check the rating on your old bell and look at the resistance in ohms. Make any adjustment yo need to do like above. If your old school ding-dong bell is now louder with 24 VAC, that indicates too much voltage (power) to strike the chime inside the old bell. Get an 8 Ohm 10-15 watt dummy load resistor to balance your new door bell circuit. If your particular RING has a different suggested resistor resistance, then change the calculation slightly. A wire wound coiled wound resistor is a stand-in for your ding-dong bell solenoid with a coil of many wires. The 30VA might be fine but 40 VA is also fine. RESISTANCE determines current at a fixed voltage, ignoring power factors in AC circuits. Your car battery has a rating of 600 cranking amps. Hooking a light bulb directly across your battery does not short out your light bulb with 600 amps. The bulb's hot resistance after warming up, determines the current. 600 amps is not flowing. 40 VA is fine for you. HTH Stefan
Answered by: Stefan
Date published: 2020-02-03

How many doorbells and thermostats will this transformer power?

How many doorbells and thermostats will this transformer power?
Asked by: Linda
This question is misleading. If your furnace has a 40VA transformer, this will work and does for my neighbor. The 40VA is the rating to operate your furnace and mainly your gas valve and any control circuitry like powering on an glow gas igniter that runs on 125VAC. Your door bell should be hooked up on a separate transformer. If you short out your RING doing some testing, you could loose heat in the winter time. Not good. Use two separate transformers. I think RING.com has a diagram of how to hook up more than one RING to power in the FAQs. HTH, Stefan
Answered by: Stefan
Date published: 2020-01-09

I plan to install 2 ea Ring 2 doorbells and possibly add a thermostat in the future. Is this transformer OK or is it overkill?

Asked by: Javert
I installed the 24 volt - 40 amp transformer because I thought if the Ring Pro worked out I might want to add more devices later. The additional cost was only $3.00 so if I never need the extra power I'm only out 3 bucks!
Answered by: Robyarr
Date published: 2019-09-18

What is the imput voltage

What is the imput voltage
Asked by: Scott
The input voltage to the transformer is 120 volts.
Answered by: Robyarr
Date published: 2019-09-17
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