
AT72D1188 Comparison
| photo | price | summary | rating |
|---|---|---|---|
![]() | $27.99 | Condition is New – Open box, Honeywell AT72D1188 Transformer 120V-24V Panel Type AT72D 1188, FREE SHIPPING | 100.0% |
![]() | $52.71 | Top Pick! Condition is New – Open box, HONEYWELL AT72D-1188 / AT72D1188 (NEW IN BOX), shipping cost = $12.90 | 99.7% |
| photo | price | summary | rating |
|---|---|---|---|
![]() | $25.90 | Condition is New, *NEW* Honeywell AT72D1188 Plate Mounted 120 Vac / 24vac Transformer Shelf Stock, shipping cost = $13.63 | 97.1% |
![]() | $28.50 | Condition is New, Honeywell AT172D 1188 Transformer Nema Type D 24 VAC, 40 VA, shipping cost = $17.02 | 100.0% |
![]() | $50.00 | Condition is New, Honeywell AT72D1188 Plate Mounted 120 Vac Transformer with 9" Lead Wires, FREE SHIPPING | 99.7% |
![]() | $71.62 | Condition is New, Honeywell AT72D1188 TRNSFMR 120V-24V PANEL TYPE TRNSFMR 120V-24V PANEL TYPE, FREE SHIPPING | 98.6% |
![]() | $74.38 | Condition is New, Honeywell AT72D1188 Transformer 40VA 120V-24V, FREE SHIPPING | ![]() |
![]() | $74.38 | Condition is New, HONEYWELL AT72D1188 Transformer 40VA 120V-24V Plate Mount UL Class 2, FREE SHIPPING | ![]() |
![]() | $69.35 | Top Pick! Condition is New, HONEYWELL AT72D-1188 / AT72D1188 (BRAND NEW), shipping cost = $12.90 | 99.7% |
| photo | price | summary | rating |
|---|---|---|---|
![]() | $16.15 | Top Pick! Condition is Used, HONEYWELL AT72D-1188 / AT72D1188, FREE SHIPPING | 99.9% |
![]() | $23.75 | Condition is Used, Honeywell AT72D 1188 Transformer, shipping cost = $20.18 | 100.0% |
![]() | $41.61 | Condition is Used, HONEYWELL AT72D-1188 / AT72D1188 (USED), shipping cost = $12.90 | 99.7% |

The Honeywell AT72D1188 Transformer is a versatile and reliable power conversion solution designed for use with Honeywell's AT72D series of thermostats and control modules. This transformer is specifically engineered to convert 120V AC input voltage to a regulated 24V AC output, making it an essential component for installations where 24V control systems are required.
The AT72D1188 Transformer is built with high-quality components and advanced engineering techniques, ensuring reliable operation in a wide range of environments. It features a robust design with a compact, low-profile housing, making it easy to install in a variety of locations. The transformer is also equipped with a built-in overload protector, which helps prevent damage to the transformer and the connected equipment in case of overcurrent conditions.
The Honeywell AT72D1188 Transformer is designed to meet the power requirements of most Honeywell thermostats and control modules, providing a stable and consistent power supply to these devices. It is compatible with various Honeywell products, including the popular RTH6580D1008, RTH9585D1008, and RTH7580D1008 thermostats, among others.
This transformer also offers the added convenience of a screw terminal design for easy wiring connections. The terminal screws are labeled clearly, ensuring that the installation process is straightforward and efficient. Additionally, the transformer comes with a 3-year limited warranty, giving users peace of mind and assurance in their investment.
In summary, the Honeywell AT72D1188 Transformer is a high-quality, reliable, and versatile power conversion solution designed for use with Honeywell's AT72D series of thermostats and control modules. Its robust design, easy installation, and overload protection make it an excellent choice for both residential and commercial applications where a stable and consistent 24V AC power supply is required.
Honeywell AT72D1188 Transformer: A Comprehensive Analysis
The Honeywell AT72D1188 transformer is a 120V-24V panel transformer designed for various Honeywell security systems. In this analysis, we will discuss its key features, advantages, disadvantages, and provide a conclusive recommendation.
Features:1. Input voltage: 120V AC, 60 Hz
2. Output voltage: 24V AC
3. Continuous output power: 10 W
4. Peak output power: 20 W
5. UL Listed
Advantages:1. Compatibility: This transformer is specifically designed for use with various Honeywell security systems, ensuring seamless integration and reliable performance.
2. UL Listed: The UL Listing signifies that the transformer has been tested and meets the safety and performance standards set by Underwriters Laboratories.
3. Compact Size: The transformer's small size makes it an ideal choice for installations where space is limited.
4. Efficient Power: The transformer's continuous and peak power ratings cater to the requirements of most Honeywell security systems.
Disadvantages:1. Limited Input Voltage: The transformer is designed for a specific input voltage of 120V AC, 60 Hz, which may not be suitable for all installations.
2. Single Output Voltage: The transformer offers only one output voltage (24V AC), which might not cater to the needs of systems requiring different output voltages.
3. Lack of Overload Protection: The transformer does not have an overload protection feature, which could potentially lead to damage if the system exceeds the transformer's power rating.
Conclusion:The Honeywell AT72D1188 transformer is a reliable and efficient choice for powering various Honeywell security systems due to its compatibility, UL Listing, compact size, and sufficient power output. However, its limited input voltage, single output voltage, and lack of overload protection might be drawbacks for some installations.
Recommendation:If you are installing a Honeywell security system and require a transformer, the Honeywell AT72D1188 is an excellent option for most installations. However, consider the transformer's limitations, and if your installation requires a different input voltage, multiple output voltages, or overload protection, you may need to look for alternative transformer solutions.
Details:
New and never used. At72d 1188 sec: blue-yellow 24v 40va semipro: black-com, white-120v 50/60hz, class 2 not wet 3 wet.
specifications maxohvac:
- brand: Honeywell
- mpn: At72d1188
- part type: Transformer Panel
- mounting style: Panel Mount
- upc: 085267035958
seller maxohvac:
- # reviews: 1587
- rating: 100.0%
- city: temple, pennsylvania
offer maxohvac:
- prices: $16.15–$74.38
- item condition:
- New – Open box
- New
- Used
- in stock #: 5
- availability: in stock
- sold #: 23
- options: ship-to-home
- started: february 23, 2025
shipping maxohvac:
- carrier: usps
- type: calculated
- class: standard
- service: usps ground advantage
- transit: 4-8 days
general maxohvac:
- category: Business & Industrial > Electrical Equipment Supplies > Power Transmers
payments maxohvac:
- other
- credit card: visa
- wallet: paypal
returns maxohvac:
- policy: no returns
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