Need a 220v transformer for the ring. Will this work for a single ring and chime in the circuit?

Hello, It will be appropriate for 220v as well as for the ring.

Will it keep your ring doorbell charged

Yes it will. In case of an outage happened, the Ring doorbell still sent messages to your smart phone.

Can i use this to run a 120v fan with a 24vac thermostat?

You could run 120v from the source (wall, etc) to the fan power and the transformer input, and the 24v transformer output to the thermostat.

Why black wire is common and white wire is 120v? Is it the white wire is not supposed to be common?

Hello, There is a diagram in the picture 6, black wire is common.

HQRP 120V-240V to 24V 40VA Transformer Compatible with Nest, Ecobee, Sensi, Honeywell Thermostat, Nest Doorbell and All Versions of Ring Doorbell Power Supply Adapter Door-Bell 120v-240v-to-24v, UL

HQRP 120V-240V to 24V 40VA Transformer Compatible with Nest, Ecobee, Sensi, Honeywell Thermostat, Nest Doorbell and All Versions of Ring Doorbell Power Supply Adapter Door-Bell 120v-240v-to-24v, UL

Product ID: 670936297

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Details

Brand
HQRP
Item weight
0.71 Kilograms
Mounting type
Wall Mount
Power source
Corded
Specification met
CSA UL

⚡40VA high power output

🔌120V-240V universal input

🛠️UL & CSA safety certified

Description

⚡ Power your smart home like a pro—never miss a ring or a temp drop!

RELIABLE WARRANTY - Backed by a 1-year warranty, ensuring your smart home stays powered without interruption.
SAFETY FIRST ALWAYS - UL and CSA certified for peace of mind and reliable, efficient performance.
EFFORTLESS INSTALLATION - Simple screw or clamp mounting with straightforward wiring—get it up and running in minutes.
UNIVERSAL COMPATIBILITY - Seamlessly works with Nest, Ecobee, Honeywell, Sensi thermostats plus all Ring and Nest doorbell models.
POWER UP MULTIPLE DEVICES - Robust 24V AC output powers several thermostats and doorbells simultaneously without a hitch.

The HQRP 120V-240V to 24V 40VA Transformer is a versatile, UL and CSA certified power adapter designed to replace underpowered transformers. It delivers a steady 24V AC output with 40VA capacity, compatible with leading smart thermostats and doorbells including Nest, Ecobee, Honeywell, Sensi, and all Ring models. Easy to install and backed by a 1-year warranty, it ensures your smart devices stay reliably powered for seamless home automation.

Specifications

ASIN	B0849RNB6S
ASIN	B0849RNB6S
Best Sellers Rank	#195,168 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #23 in Door Bell Transformers
Brand Name	HQRP
Customer Reviews	4.4 4.4 out of 5 stars (195)
Customer reviews	4.4 4.4 out of 5 stars (195)
Date First Available	29 June 2020
Item Weight	0.71 Kilograms
Item model number	887774401282011
Manufacturer	HQRP
Manufacturer	HQRP
Minimum Frequency	60 Hz
Model	887774401282011
Mounting Type	Wall Mount
Package Dimensions	10.49 x 6.91 x 6.81 cm; 712 g
Part Number	887774401282011
Power Source	Corded Electric
Specification Met	CSA, UL
UPC	884667525003

Reviews

G**S

Bonita presentación y muy prácticos y de mucha utilidad

15.04.2023

A**H

Good

6.02.2026

T**Y

The transformer in my apartment failed, and this replacement worked perfectly right out of the box. Installation was straightforward, and it restored everything without needing an expensive service call. A simple fix that ended up saving me hundreds of dollars.

9.03.2026

G**N

I replaced my faulty hvac transformer with this and it worked like a champ. The photos and answered questions in the listing for wire connections were more helpful than the printed instructions. Regardless, it was straightforward and simple. A quick double check on my wiring after installing and then my HVAC was back on business in under an hour of delivery.

24.05.2021

L**B

Transformer worked

1.11.2025

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