
KTAT-375-480-277-A Comparison
| photo | price | summary | rating |
|---|---|---|---|
![]() | $27.99 | Condition is New, Keystone Autotransformer KTAT-375-480-277 480-277V Or 347V-200V - New - JZ123, FREE SHIPPING | 100.0% |
![]() | $39.59 | Condition is New, KEYSTONE KTAT-375-480-277/A BALLAST DRIVER AUTOTRANSFORMER 480V-277V, FREE SHIPPING | ![]() |
![]() | $69.59 | Condition is New, KEYSTONE KTAT-375-480-277 /A BALLAST 480V TO 277V, FREE SHIPPING | ![]() |
![]() | $44.99 | Condition is New, Keystone KTAT-375-480-277/A 277/480V Step Down Transformer Ballast, shipping cost = $29.88 | 99.8% |
| photo | price | summary | rating |
|---|---|---|---|
![]() | $29.75 | Condition is New – Open box, Keystone KTAT-375-480-277/A Ballast Driver Autotransformer 480V 277V, FREE SHIPPING | ![]() |
![]() | $31.15 | Condition is New – Open box, Keystone KTAT-375-480-277/A Step-Down Auto Transformer W/Lead Wire, FREE SHIPPING | ![]() |
![]() | $25.00 | Condition is New – Open box, KEYSTONE KTAT-375-480-277/A BALLAST DRIVER AUTOTRANSFORMER 480V-277V, shipping cost = $8.75 | 100.0% |
![]() | $25.00 | Condition is New – Open box, Keystone 375VA Autotransformer 480V to 277V Step-Down Chassis Mount AC to AC, shipping cost = $13.26 | 100.0% |
![]() | $24.95 | Condition is New – Open box, Keystone KTAT-375-480-277/A Autotransformer 480V to 277V, shipping cost = $17.45 | 100.0% |
![]() | $59.13 | Condition is New – Open box, KTAT-375-480-277 /A Keystone High Voltage Step Down Transformer 375W 480V/277V, shipping cost = $12.50 | 99.9% |
![]() | $80.00 | Top Pick! Condition is New – Open box, Keystone Step-Down Auto Transformer w/ Lead Wire - Damage-Dented Qty3, FREE SHIPPING | 99.9% |
| photo | price | summary | rating |
|---|---|---|---|
![]() | $29.99 | Condition is Used, KEYSTONE AUTOTRANSFORMER KTAT-375-480-277 INPUT: 480 TO 277V OR 347V TO 200V, FREE SHIPPING | 100.0% |
![]() | $27.47 | Top Pick! Condition is Used, Keystone Step-Down Auto Transformer w/ Lead Wire - Damage-Dented & Dirty , shipping cost = $5.95 | ![]() |
| photo | price | summary | rating |
|---|---|---|---|
![]() | $73.19 | Condition is Open box, (2) 480V to 277V AutoTransformer Keystone KTAT-375-480-277 /A Lot of 2, FREE SHIPPING | 99.3% |



The Keystone K Tat-375-480-277/A Ballast Driver Autotransformer is a versatile and reliable electrical component designed for use in commercial and industrial lighting applications. This autotransformer is specifically designed to operate at both 277 volts and 480 volts, making it an ideal choice for facilities that require flexibility in their power supply.
The Keystone K Tat-375-480-277/A Ballast Driver Autotransformer is constructed using high-quality materials to ensure durability and reliability. The transformer features a robust cast iron housing that is both corrosion-resistant and heat-resistant, providing protection against the harshest environmental conditions. The internal windings are made of copper wire, which is known for its superior conductivity and resistance to corrosion.
The autotransformer has a rated output of 375 watts, making it suitable for use with a wide range of lighting fixtures. It is designed to operate at a frequency of 60 Hz and has a power factor of 0.95, ensuring efficient operation and minimal energy waste. The transformer is also equipped with overload protection, which automatically cuts off power if the transformer exceeds its rated capacity, providing an additional layer of safety.
The Keystone K Tat-375-480-277/A Ballast Driver Autotransformer is easy to install and integrate into existing electrical systems. It features a convenient terminal block for easy connection of electrical wires, and its compact size makes it easy to install in tight spaces. The transformer is also UL listed, ensuring that it meets the highest standards of safety and performance.
In summary, the Keystone K Tat-375-480-277/A Ballast Driver Autotransformer is a high-quality and reliable electrical component designed for use in commercial and industrial lighting applications. Its versatile voltage rating, robust construction, and efficient operation make it an ideal choice for facilities that require flexibility and reliability in their power supply.
Pros of purchasing a Keystone K Kat-375-480-277/A Ballast Driver Autotransformer 480v 277v:1. Versatility: This autotransformer can be used for both 480v and 277v applications, making it a flexible choice for various lighting systems.
2. Energy Efficiency: Autotransformers are generally more energy-efficient than traditional isolation transformers since they don't have a no-load current.
3. Space-Saving: Autotransformers are typically smaller and lighter than isolation transformers, saving on installation space.
4. Cost-Effective: Since autotransformers have fewer components than isolation transformers, they are generally less expensive.
Cons of purchasing a Keystone K Kat-375-480-277/A Ballast Driver Autotransformer 480v 277v:1. Limited Voltage Range: Autotransformers have a limited voltage range compared to isolation transformers, which may not be suitable for all applications.
2. Limited Load Capacity: Because autotransformers have a single winding, they may have lower load capacity than isolation transformers with multiple windings.
3. Potential for Voltage Regulation Issues: Autotransformers may not provide as stable voltage regulation as isolation transformers.
Conclusion:The Keystone K Kat-375-480-277/A Ballast Driver Autotransformer 480v 277v is a cost-effective and energy-efficient option for applications that require both 480v and 277v voltages. Its smaller size and lighter weight make it a space-saving choice, but its limited voltage range and load capacity may not be suitable for all applications.
Recommendation:If you require a versatile and cost-effective solution for applications that require both 480v and 277v voltages, the Keystone K Kat-375-480-277/A Ballast Driver Autotransformer 480v 277v is a solid choice. However, if you have applications that require a wider voltage range or higher load capacity, you may want to consider an isolation transformer instead.
Details:
New, packaging distressed. Has minor scratches from transportation.
specifications faclighting:
- brand: Keystone
- mpn: Ktat-375-480-277/a
- type: Autotransformer
- color: Black
- material: Metal
- item length: 14
- upc: 890949013816
seller faclighting:
- rating: 99.4%
- # reviews: 53581
- city: ogden, utah
offer faclighting:
- sold #: 44
- started: march 17, 2024
- availability: in stock
- options: ship-to-home
- in stock #: 5
- prices: $24.95–$80.00
- item condition:
- New
- New – Open box
- Used
- Open box
returns faclighting:
- paid by: seller
- method: money back
- time: 30 days
- policy: returns accepted
general faclighting:
- category: Business & Industrial > Maintenance Safety > Facility > Lights Lighting
payments faclighting:
- wallet: google-pay
- credit card: discover
shipping faclighting:
- transit: 4-6 days
- service: standard, expedited
- class: standard, expedited
- type: fixed
Grouped With:
- KTEB-286HO-UV-IS-N: BALLAST, Keystone
- KT-LED27HID-H-EX39-850-D: , Keystone
- 2048-46: BALLAST, Keystone
- KTEB-232-UV-IS-N-P: BALLAST LAMP, Keystone
- KTEB-232RIS-1-TP-SL: BALLAST, Keystone
- KTLD-20-UV-SC730-56-VDIM-AF4: DRIVER, Keystone
- KTEB-240-UV-TP-PIC: BALLAST, Keystone
- KTSB-E-0432-14-UV-A: BALLAST, Keystone
- KTSB-E-1040-14-UV-A: BALLAST, Keystone
- KTEB-228HE-UV-PS-SL: BALLAST LAMP, Keystone Technologies
- KTEB-226-UV-RS-DW: BALLAST KIT, Keystone














