Home » Blog » Hotop 1 Pack 24 Volt Transformer, 40 VA AC Transformer Plug in with PTC Fuse Compatible with Ring Doorbell and Thermostat, Compatible with Nest, Ecobee, Sensi/Honeywell/24V Adapter

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Hotop 1 Pack 24 Volt Transformer, 40 VA AC Transformer Plug in with PTC Fuse Compatible with Ring Doorbell and Thermostat, Compatible with Nest, Ecobee, Sensi/Honeywell/24V Adapter

Tech Under 30

January 1, 2026

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Price: $169.98 - $19.99
(as of Jan 01, 2026 02:10:28 UTC – Details)

Product description

UL Certification

Safe and stable to use. Auto-resetting (PTC) fused secondary

Specification

input voltage: 120 VAC, 60Hz Output voltage: 24V, 40VA

Power Source: Corded

Full Power Transformer

Transformer

24v 40va transformer power enough to keep

Add to Cart

Add to Cart

Add to Cart

Customer Reviews

4.4 out of 5 stars 2,208

4.4 out of 5 stars 2,208

4.4 out of 5 stars 2,208

Price

$19.99$19.99 $34.99$34.99 $59.99$59.99

Quantity
1 Pack 2 Pack 4 Pack

Power Source
Corded Electric Corded Electric Corded Electric

Maximum Frequency
60 Hz 60 Hz 60 Hz

Specification Met
UL UL UL

Product Dimensions ‏ : ‎ 2.13 x 2.56 x 3.94 inches; 1.6 Pounds
Item model number ‏ : ‎ PS D40
Date First Available ‏ : ‎ January 11, 2020
Manufacturer ‏ : ‎ Hotop
ASIN ‏ : ‎ B083R621RV
Best Sellers Rank: #12,932 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #14 in Door Bell Transformers
Customer Reviews: 4.4 4.4 out of 5 stars (2,208) 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); } }); });

【Warm Tips】Please read the installation instructions carefully before use (the middle terminal is connected to the ground wire) to avoid installation errors that may cause the product to become unusable
Eliminate doorbell/ thermostat underpower hassle: 24V 40VA plug in transformer, replaces and upgrades underpowered transformer with this 24V AC transformer, offering plenty of power for your thermostats and doorbells
Specification: input voltage: 120 VAC, 60Hz; Output voltage: 24V, 40VA; The power supply needs to be disconnected during the installation process; The resistor is not insulated; Please wear insulating gloves and other protective tools to avoid injury
Safe and stable: auto resetting (PTC) fused secondary, LED green power indicator, positive/ negative/ screw terminals
UL Certified and Easy Installation: electrical outlet mounting tab; Warm Tip: Only equip with plug in transformer, no wires included
Universal compatibility: this 24v transformer is compatible with Ring video doorbell, Ring video doorbell 2, Ring video doorbell pro, Nest Skybell Doorbell, also compatible with Nest, Ecobee/Honeywell and Sensi Smart Thermostats, and other devices, that require constant 24 volt power for operation; Note: please add a 50W Watt 25 Ohm Resistor if you use this transformer to charge a doorbell, the brand above is only for demonstrating compatibility