Auto-Transformers

While our website showcases a large assortment of our products, it does not reflect the complete inventory of products currently available. For real-time availability and to ensure we can meet your specific needs, please contact our sales team at 1-800-328-1842. New products arrive daily and our knowledgeable staff are happy to assist you in locating the exact item(s) you need.

ACME 15 KVA 600Y/347-480Y/277 Volt 3 Phase Auto Transformer R&G

ACME Auto Transformer: 15 KVA, High Voltage: 600Y/347 Volt, Low Voltage: 480Y/277 Volt, 3 Phase, NEMA 3R outdoor. Reconditioned & guaranteed with a one-year warranty.
SKU: TR202427945
$1,000.00

AFP MSA3-1478-6-048-130 200HP 480V 3-Coil Auto Transformer

AFP Auto Transformers LLC: Cat# MSA3-1478-6-048-130, 200 horsepower, 480 volt, 3 coil, 246 full load amps, 1178 locked rotor amps (LRA). Part# 840011981, customer part# MA3-1478-6-0480, NEMA medium, open type, taps: 0%, 50%, 65%, 80%, 100%. Sold Used Electrically OK.
SKU: MSA3-1478-6-048-130
$1,200.00

Allen Bradley X-298740NE 200HP 480V 3-Coil Auto Transformer

Allen Bradley Auto Transformer: Cat# X-298740NE, 200 horsepower, 480 volt, 3 coil, open type, taps: 0%, 50%, 65%, 80%, 100%. Used Electrically OK.
SKU: X-298740NE
$1,200.00

Dongan 33 KVA 208-240 Volt 3 Phase Auto Transformer R&G

Dongan Auto Transformer: 33 KVA, Primary Voltage: 208 Volt, Secondary Voltage: 240 Volt, 3 Phase, NEMA 3R outdoor. Reconditioned & guaranteed with a one-year warranty.
SKU: TR202327830
$1,500.00

GE CR9194-U100A3A-30301-C1.50 150HP 460V 3-Coil Auto Transformer

General Electric Auto Transformer: Cat# CR9194-U100A3A-30301-C1.50, 150 horsepower, 460 volt, 3 coil, open type, taps: 0%, 50%, 65%, 80%, 100%. Sold Used Electrically Ok.
SKU: CR9194-U100A3A-C0301-C1.50
$1,000.00

GE CR9194-W100A3A-30301-C2.00 200HP 460V 3-Coil Auto Transformer

General Electric Auto Transformer: Cat# CR9194-W100A3A-30301-C2.00, 200 horsepower, 460 volt, 3 coil, open type, taps: 0%, 50%, 65%, 80%, 100%. Sold Used Electrically OK.
SKU: CR9194-W100A3A-30301-C2.00
$1,200.00

GTE Sylvania/Clark 400HP 480V 3-Coil Auto Transformer

GTE Sylvania / Clark Control Inc Auto Transformer: Type ST, Cat# TR63-18, 400 horsepower, 460 volt, 3 coil, 60Hz, open type, medium duty, taps: 0%, 50%, 65%, 80%, 100%. Sold Used Electrically Okay.
SKU: ST-TR63-16
$2,250.00

Hammond 3009C1. 100HP 480V 3-Coil Auto Transformer

Hammond Auto Transformer: Cat# 3009C1., 100 horsepower, 480 volt, 3 coil, open type, taps: 0%, 50%, 65%, 80%, 100%. Used Electrically OK.
SKU: 3009C1.
$750.00

Hammond 9 KVA 600/480-208/240V 3 Phase Dry Type Auto Transformer R&G

Hammond Dry Type Auto Transformer: 9 KVA, High Voltage: 600/480 Volt, Low Voltage: 208/240 Volt, 3 Phase, NEMA 1 indoor. Reconditioned & guaranteed with a one-year warranty.
SKU: TR202427946
$500.00

Hevi-Duty 200HP 440/480V 3-Coil Auto Transformer

Hevi-Duty Auto Transformer: Cat# K2ST200A, 200 horsepower, 440/480 volt, 3 coil, open type, taps: 0%, 50%, 65%, 80%, 100%. Sold Used Electrically OK.
SKU: K2ST200A
$1,200.00

JE 10372M D 150HP 460/575V 3-Coil Auto Transformer

JE Auto Transformer: Cat# 10372M D, 150 horsepower, 460/575 volt, 3 coil, open type, taps: 0%, 50%, 65%, 80%, 100%. Sold Used Electrically OK.
SKU: 10372MD
$1,000.00

Neco-Hammond 29401C1.0 100HP 480V 2-Coil Auto Transformer

Neco-Hammond (Manufactured for Westinghouse) Auto Transformer: Cat# 29401C1.0, 100 horsepower, 480 volt, 2 coil, open type, taps: 0%, 50%, 65%, 80%, 100%. Sold Used Electrically Ok.
SKU: 29401C1.0
$750.00

Neco-Hammond 29401C1.5 150HP 480V 2-Coil Auto Transformer

Neco-Hammond (Manufactured for Westinghouse) Auto Transformer: Cat# 29401C1.5 / 553D124G48, 150 horsepower, 480 volt, 2 coil, open type, taps: 0%, 50%, 65%, 80%, 100%. Sold Used Electrically OK.
SKU: 29401C1.5
$1,000.00

Square D 2787-B34-G2 25HP 480V 2-Coil Auto Transformer

Square D Auto Transformer: Cat# 2787-B34-G2, 25 horsepower, 480 volt, 2 coil, open type, taps: 0%, 50%, 67%, 84%, 100%. Sold Used Electrically OK.
SKU: 2787-B34-G2
$500.00

Square D 2787-B4-G2 25HP 480V 2-Coil Auto Transformer

Square D Auto Transformer: Cat# 2787-B4-G2, 25 horsepower, 480 volt, 2 coil, open type, taps: 0%, 50%, 67%, 84%, 100%. Sold Used Electrically OK.
SKU: 2787-B4-G2
$500.00

Square D 30484-510-66 76-125HP 480V 2-Coil Auto Transformer

Square D Auto Transformer: Cat# 30484-510-66, 76-125 horsepower, 480 volt, 2 coil, open type, taps: 0%, 50%, 67%, 84%, 100%. Sold Used Electrically OK.
SKU: 30484-510-66
$750.00

Square D MSA75T202H2 75HP 480V 2-Coil Auto Transformer

Square D Auto Transformer: Cat# MSA75T202H2, 75 horsepower, 480 volt, 2 coil, open type, taps: 0%, 50%, 65%, 80%, 100%. Sold Used Electrically OK.
SKU: MSA75T202H2
$650.00

Sta-Rite Industries 350HP 375A 1550KVAR 480V 3-Coil Motor Starting Reactor

Sta-Rite Industries Inc. Transformer: Div Ser# 275792176, 150 horsepower, 480 volt, 3 coil, open type, taps: 0%, 50%, 65%, 80%, 100%. Sold Used Electrically OK.
SKU: 275792176
$1,800.00

Westinghouse 1747029 50HP 440V 2-Coil Auto Transformer

Westinghouse Auto Transformer: Cat# 1747029, 50 horsepower, 480 volt, 2 coil, open type, taps: 0%, 50%, 67%, 84%, 100%. Sold Used Electrically OK.
SKU: 1747029
$600.00

Westinghouse 553D123G36 100-125HP 220V 2-Coil Auto Transformer

Westinghouse Auto Transformer: Cat# 553D123G36, 100-125 horsepower, 220 volt, 2 coil, open type, taps: 0%, 50%, 67%, 84%, 100%. Sold Used Electrically OK.
SKU: 553D123G36
$750.00

Tested, Certified Auto Transformers In Stock

 

Looking for Auto Transformers? We’ve got them in stock for industrial and commercial including new, refurbished, reconditioned, and obsolete auto transformers. Electrical transformer safety is always a priority, so each auto transformer goes through electrical testing procedures for optimal performance and reliability.

Auto transformers with single winding are a compact and cost-effective solution compared to traditional transformers, like Medium Voltage Transformers and Low Voltage transformers. Single windings mean a smaller physical footprint. This makes them particularly useful in applications where space and cost considerations are important factors. Medium and Low Voltage transformers with separate primary and secondary windings are designed for stepping up or stepping down voltage levels.

 

What to Know: Selecting Auto Transformers for Industrial or Commercial Applications

 

Coils: How many coils does this auto transformer have, and what is their configuration?

Coil configuration affects the transformer's efficiency, voltage regulation, and overall performance. Different coil arrangements for different applications means better power distribution and stability.

Condition: What is the current condition of the auto transformer, including any refurbishments or reconditioning?

Knowing the condition of the transformer is vital for assessing its reliability and longevity. Refurbished or reconditioned transformers offer cost-effective alternatives without compromising performance.

Horsepower: What is the horsepower rating of this auto transformer?

Horsepower directly correlates with the transformer's capacity to handle the electrical load of industrial machinery. Choosing a transformer with the appropriate horsepower rating means compatibility and prevents overloading, protecting the transformer and your equipment.

Indoor/Outdoor: Is this auto transformer suitable for indoor or outdoor use?

Knowing whether the transformer is designed for indoor or outdoor applications determines environmental durability needed and safety features. Factors such as weatherproofing, insulation, and enclosure design vary between indoor and outdoor transformers.

KVA: What is the KVA (kilovolt-ampere) rating of this auto transformer?

The KVA rating indicates the transformer's maximum capacity to handle electrical power, considering both voltage and current. Choosing a transformer with the correct KVA rating gives you sufficient power to machinery while preventing overloads.

Phase: How many phases does this auto transformer support?

Understanding the phase configuration leads to compatibility with the electrical system. Single-phase or three-phase, selecting the correct phase configuration delivers seamless integration and efficient power distribution.

Primary Voltage: What is the primary voltage rating of this auto transformer?

Knowing the primary voltage rating supports compatibility with the electrical infrastructure. Matching the transformer's primary voltage to the available power source prevents voltage mismatches, for safe and efficient operation while avoiding potential damage to the transformer and connected equipment.

Secondary Voltage: What is the secondary voltage output of this auto transformer?

Secondary voltage output is crucial for compatibility with the voltage requirements of the industrial machinery it powers. Matching the transformer's secondary voltage to the machinery's specifications gives the best performance and avoids potential damage or malfunction.

Voltage: What is the voltage regulation capability of this auto transformer?

Voltage regulation refers to the transformer's ability to have stable output voltage under varying load conditions. Knowing the voltage regulation capability is important for consistent and reliable power supply, minimizing voltage fluctuations.

 

Where to Use Auto Transformers

Voltage RegulationAuto transformers are commonly used for voltage regulation in electrical distribution systems.
Motor StartingAuto transformers can be used for motor starting applications, especially for large motors with high inrush currents.
Variable Voltage SystemsAuto transformers are important in variable voltage systems used in industrial processes and laboratory setups.
Voltage ConversionAuto transformers support voltage conversion between different systems or regions with varying voltage standards.
Power DistributionAuto transformers play a key role in power distribution networks, especially in utility substations and industrial complexes.
Audio SystemsIn audio systems, auto transformers are used for impedance matching and volume control.
Lighting SystemsAuto transformers are found in lighting systems to control voltage levels and the brightness of lamps.
Railway ElectrificationAuto transformers in railway electrification systems convert and distribute high-voltage AC power to overhead catenary wires.

 

Electrical Testing for Transformer Quality

When you choose EMSCO, you're selecting a provider that specializes in expertly refurbishing pre-owned auto transformers. Every component undergoes reconditioning processes to meet PEARL standards, ensuring it aligns with our quality criteria and your requirements. All our reconditioned equipment is backed by a comprehensive 1-year warranty, giving you peace of mind. Plus, we offer detailed test reports auto transformers, providing complete assurance of their performance and reliability.

 

Looking to Sell Auto Transformers?

Let Us Assist You: Do you have surplus industrial electrical equipment? EMSCO is here to help. Our dedicated team actively purchases surplus transformers, offering prompt assistance. Simply provide details such as catalog numbers, brand names, and pictures, and receive a fast quote.