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.

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HQRP 120V-240V to 24V 40VA Transformer Compatible with Nest, Ecobee, Sensi, Honeywell Thermostat, Nest Doorbell and All Versions of Ring Doorbell

HQRP 120V-240V to 24V 40VA Transformer Compatible with Nest, Ecobee, Sensi, Honeywell Thermostat, Nest Doorbell and All Versions of Ring Doorbell

Product ID: 622598441

Details

Brand
HQRP
Item Weight
0.71 Kilograms
Mounting Type
Wall Mount
Power Source
AC mains
Specification Met
CSA UL

⚡40VA power output

🔌120V-240V wide input range

🛠️Easy screw or clamp installation

Description

⚡ Power your smart home with confidence and ease!

PLUG PLAY SETUP - Effortless installation with screw or threaded clamp mounting—get up and running in minutes.
UNIVERSAL COMPATIBILITY - Works flawlessly with Nest, Ecobee, Sensi, Honeywell thermostats, and all Ring doorbell versions.
POWER PACKED PERFORMANCE - Delivers a reliable 24V AC at 40VA for seamless thermostat and doorbell operation.
BUILT FOR MODERN SMART HOMES - Supports HVAC controls, relays, and gas valves—future-proof your smart home ecosystem.
CERTIFIED SAFETY RELIABILITY - C(UR)US listed for peace of mind with high efficiency and a 1-year warranty.

The HQRP 120V-240V to 24V 40VA Transformer is a versatile, UL-listed power solution designed for smart thermostats and doorbells. Compatible with top brands like Nest, Ecobee, Honeywell, and Ring, it offers a wide input voltage range and easy installation, backed by a 1-year warranty for reliable, efficient performance in modern HVAC and smart home systems.

Specifications

ASIN	B0849RNB6S
Best Sellers Rank	#265,436 in Home Improvement ( See Top 100 in Home Improvement ) #23,414 in Home Improvement Electrical
Brand	HQRP
Brand Name	HQRP
Country of Origin	USA
Customer Reviews	4.4 out of 5 stars 195 Reviews
Included Components	Transformer.
Item Weight	0.71 Kilograms
Manufacturer	HQRP
Minimum Frequency	50 Hz
Model Number	887774401282011
Mounting Type	Wall Mount
Part Number	887774401282011
Power Source	AC mains
Power Source Type	AC mains
Specification Met	CSA, UL
UPC	884667525003

Reviews

G**S

Excelente producto y muy buena calidad

Bonita presentación y muy prácticos y de mucha utilidad

15.04.2023

A**H

Work good

6.02.2026

T**Y

Perfect Replacement That Saved Me Hundreds

9.03.2026

G**N

Worked like a champ for my HVAC thermostat

24.05.2021

Z**I

Poor quality

14.02.2026

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