Finding the best 24v transformer suitable for your needs isnt easy. With hundreds of choices can distract you. Knowing whats bad and whats good can be something of a minefield. In this article, weve done the hard work for you.
Reviews
1. Functional Devices TR50VA001 Transformer, 50Va, 120 to 24 Vac, Foot and Single Threaded Hub Mount
Feature
50Va120 to 24 vac
Sold as each
Description
50VA, 120 to 24 VAC, sold as each, Functional Devices TR50VA001 transformer, 50VA, 120 to 24 VAC, foot and single threaded hub mount. Made in United States. Manufactured by Functional Devices, Inc.2. MG ELECTRONICS MGT2420 CLASS 2 TRANSFORMER 24VAC 20VA UL APPROVED
Feature
POWER TRANSFORMERS, VOLTAGE: 24 VOLT, POWER: 20 VA, USED IN: SECURITY APPLICATIONS SUCH ASSEMBLYALARM PANELS, DOOR ACCESS CONTROLS AND S
Description
POWER TRANSFORMERS, VOLTAGE: 24 VOLT, POWER: 20 VA, USED IN: SECURITY APPLICATIONS SUCH ASSEMBLY ALARM PANELS, DOOR ACCESS CONTROLS AND S3. LockState Connect LS-24VAC 24 Vac Adaptor for LS-90i
Feature
Provides 24V power when plugged into a standard 110 wall outletComplete with 20-Foot cord
Non-polarity wires make for simple installation
Description
The 24VAC power adapter will provide power to the LS-60(i) and LS-90(i) from any standard electrical outlet. This can be used if you do not have an existing C-Wire coming up from your furnace to your thermostat. This transformer converts 110VAC to 24VAC for use with LS-60(i) and LS-90(i) thermostats. Simply connect one end to the "Rh" terminal and the other end to the "C" terminal. You can connect either wire to either terminal (there is no polarity).4. Honeywell AT140A1000 40Va, 120V Transformer - 60 Hz.
Feature
Foot mounted, plate mounted, clamp mounted or panel mounted 120 Vac Transformer with Metal end bellsColor-coded leadwires for primary connections and screw terminals for secondary connections, fixed 1/4 inch (6 mm) male quick-connects or color-coded leadwires for both primary and secondary, are standard
Meet Underwriters Laboratories Inc. Standard UL 1585 and are identified. Class 2 not wet, Class 3 wet
Meet NEC Class 2 requirements
Foot mounted, plate mounted on 2x4 in. or 4x4 in. outlet box, clamp mounted using outlet box knockout, or panel mounted
Description
HONEYWELL 40 VA STEP DOWN TRANSFORMER *Converts 120V to 24V *Foot plate knockout mounting *120 primary voltage, screw terminals connections on secondary circuit *9" leadwire connections *Provides power to 24 vac circuits in heating / cooling systems *Intended for use in systems with predictable, uniform loads *UL listed5. 24 Volt C-Wire Power Adapter/Transformer for Ecobee Nest Honeywell Smart Wifi Thermostat and Ring Doorbell by Fyve Global | 25 ft Cable
Feature
STANDARD HOME USE - Plugs into standard 110v outlet and converts to 24 volt AC currentPOWER SMART DEVICES - Powers popular smart thermostats (Nest, Ecobee, Honeywell, Sensi, etc.), wifi doorbells (Ring, Skybell), sprinkler systems and other devices that require constant 24 volt power for operation
EASY INSTALLATION - 2 pin non-polarity wires to ensure easy and error free installation for installers of all skill levels and knowledge bases
EXTRA LONG CABLE - 25 foot cable for added flexibility of long distance wiring
WHAT'S INCLUDED - 24 volt adapter and 1 year warranty on replacement or repair
Description
This adapter offers a powering solution to your wifi smart thermostat or smart doorbell, geared toward those that currently have outdated doorbell or HVAC wiring (large percentage of older homes). From any standard 110v electrical outlet, this provides the constant 24 volt power required by today's top wifi smart thermostat brands via the common wire (C) terminal in your thermostat's wiring setup.
The adapter has a 25 foot cable for flexibility of long distance installation, and/or for tidy wiring along baseboards and moldings.
Installation is a breeze with non-polarity pins allowing each pin to be connected to any terminal (so no mistakes). Simply install any pin to the "C" terminal and "RC" terminal (in furnace/boiler only wiring setups) or "RH" (in cooling systems), plug adapter into outlet and power up; for Ring wifi doorbells, either pin can be installed around either terminal
Save hundreds on hiring an electrician or HVAC professional to run new wiring, and solve the issue yourself, safely, in just a few minutes.
6. MG ELECTRONICS MGT2420 TRANSFORMER,24VAC 20VA UL APPROVED
Feature
Class 2 Power SupplyInput : 120V 60Hz
Output : 24VAC 20VA
Output Connector ID x OD : Screw terminals with green LED
Size H x W x D (inches) : 3.2 x 2.2 x 1.9
Description
24V AC, 20VA Class II Plug-in AC power supplies for security cameras/panels. Primary: 120 Volt 60HZ screw terminals (White Housings)7. Packard PF42440 Control Transformer Class II Foot Mount 40VA 24V
Feature
Wire length 8". UL ListedMounting Configuration: 2 Foot
Primary Voltage: 120/208/240
Secondary Voltage: 24
VA Rating: 40
Product Depth (in.) 4.1 Product Height (in.) 2.8 Product Width (in.) 2.7
Product Weight (lb.) 1.65lb
Description
Class 2 rated, inherently limited transformers easily mount for use on low voltage control circuits. Designed for over 60, 000 hours continuous use under normal load conditions.8. Elk TRG2440 24VAC, 40 VA AC Transformer with PTC Fuse
Feature
Input Voltage: 120 VAC, 60Hz, .43A, Output Voltage: 24 Volts A.C.Auto-Resetting (PTC) Fused Secondary
Green Power On LED, Grounding Prong & Terminal
Electrical outlet mounting tab
H = 4.14-Inch, W=2.74-Inch, D = 2.2-Inch.
Description
Elk TRG2440 24VAC, 40 VA AC Transformer with PTC FusePackage Quantity:1 | Color:White TRG2440 Step Down Transformer, ELKTRANSFMRLIFE WTYLED 24/40VA, Elk Products,Inc. Category: Transformers, Power UPC Code: 762158124402 TRG2440 Step Down Transformer, ELKTRANSFMRLIFE WTYLED 24/40VA, Elk Products,Inc. Category: Transformers, Power UPC Code: 762158124402
Manufactured by: ELK
9. Honeywell AT72D1683 120V/24V Transformer
Feature
Override protection providedColor-coded leadwires for primary connections
Energy limiting, meets NEMA Standard DC20-1992
Transformer is marked NEMA Type D. Meets NEC Class 2 not wet, Class 3 wet and U.L. 1585 requirements
Mount within proper enclosure
Description
24 volt control circuit step-down transformer designed to power any 24 volt control system, including thermostats, gas valves and/or relays. Voltage (50/60Hz) 120. Connections 2 screw terminals, can be foot-mounted, plate mounted on 4" x 4", 4" octagon or 2" x 4" electrical boxes (transformer all above plate or 3/4 above plate); or clamp mounted via a junction box knockout.10. Edwards Signaling 599 120V/24V 40W Transformer
Feature
Non-regenerative thermal overload protectionGrounding wire
Pre-stripped primary side pigtails
Screw terminal connections on secondary
120V AC / Secondary 24V AC 40 VA
Description
Edwards Signaling 599 Class 2 Signaling Transformers are easy to install, low voltage power sources for residential, commercial, and industrial uses. Mounts in a standard 1/2" (13mm) knockout or surface mounts using the provided foot mounts. These transformers are suitable for mounting in both plastic and metal back boxes. May also be used with the 593 transformer plate for enclosed mounting in a standard two gang outlet box. The Edwards 599 transformer offer high power for long wire runs or for applications requiring greater power such as door openers. Ideal for large apartments and building elevators. When selecting transformers, attention should be given to the power requirements of the signal or load and the wire run between the transformer and load.11. Heath Zenith SL-125-02 Wired Door Chime Transformer
Feature
Low Voltage Hardwired TransformersWired Door Chime Transformer
Tri-Volt / Clamp-On or panel mount type
Input: 120VAC - Output: 8VAC-10VA, 16VAC-10VA, 24VAC-20VA
Description
SL-125 Doorbell Transformer. Install the Heath Zenith Wired Door Chime Transformer when replacing a door bell with a door chime. It features a Low-Voltage wired design and 3 options for electrical output: 8 VAC/10 VA, 16 VAC/10 VA or 24 VAC/20 VA.12. Aprilaire 4010 Transformer
Feature
Humidifier transformer for models 400, 550, 550a, 558, 560, 560a, 568, 600Connect leads to 110-volt current; the screw terminals will then provide 24 volts
1 year manufacturer's limited warranty
Description
About the Aprilaire 4010 humidifier transformer the Aprilaire 4010 humidifier transformer provides the ability to convert 110Volt to 24 volt for installation. The leads connect to your 110 volt supply and the screw terminals then provide the 24 volt output to the humidifier. The Aprilaire 4010 humidifier transformer is designed for use with Aprilaire humidifiers 400, 550, 550a, 558, 560, 560a, 568 amp; 600.13. Class II Transformer - 24 Volt AC, 40 VA, UL/CSA Approved : MGT-2440
Feature
Positive / Negative / ground Screw Terminals.LED Indicator. No user manual or documentation in the box.