ABB Single-Phase Buck-Boost Dr...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$758.53
ABB Single-Phase Buck-Boost Dry-Type Transformer, NEMA 3R Enclosure

ABB Single-Phase Buck-Boost Dry-Type Transformer, NEMA 3R Enclosure

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Model: 9T51B0107

In Stock (leaves warehouse same day if ordered before 3pm ET)

$758.53
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ABB Single-Phase Buck-Boost Dry-Type Transformer, NEMA 3R Enclosure

The ABB Single-Phase Buck-Boost Dry-Type Transformer is a small, dry-type distribution transformer designed and shipped as an insulating/isolating transformer, built with a dual-voltage primary and a dual-voltage secondary and housed in a NEMA 3R enclosure. These transformers can be field-connected for a wide range of voltage combinations, and the most common use is to buck (lower) or boost (raise) supply voltage a small amount, usually 5 to 27%. When field-connected as an autotransformer, this ABB unit complies with NEC Article 210-9, Exception 1, making it a practical fix for minor voltage mismatches in existing single-phase electrical systems.

Key Features

  • Dual-Voltage Design: a dual-voltage primary and dual-voltage secondary allow this transformer to be field-connected for a wide range of voltage combinations.
  • Buck-Boost Function: bucks (lowers) or boosts (raises) supply voltage by approximately 5 to 27%, correcting minor voltage mismatches without a full-capacity isolation transformer.
  • Dry-Type Construction: single-phase, dry-type distribution transformer shipped as an insulating/isolating transformer for reliable, low-maintenance operation.
  • NEMA 3R Enclosure: housed in a NEMA 3R-rated enclosure suitable for outdoor and wet-location installations.
  • Electrical Ratings: single-phase (1ø) unit rated for 60Hz frequency with a 40° temperature rating, per manufacturer specifications.
  • Code Compliance: complies with NEC Article 210-9, Exception 1, when field-connected as an autotransformer.

Certifications & Compliance

  • NEMA 3R Rated Enclosure
  • NEC Article 210-9, Exception 1 Compliant (when field-connected as an autotransformer)

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Commercial and Industrial Electrical Installations
  • Voltage Correction on Existing Branch Circuits
  • Single-Phase Motor and Lighting Circuits
  • Outdoor and Wet-Location Installations
  • Renovation and Retrofit Wiring Projects

Why ABB?

ABB engineers its Buck-Boost transformers as dry-type, insulating/isolating units housed in a NEMA 3R enclosure, giving electricians a dependable way to correct minor voltage mismatches without replacing existing wiring. With dual-voltage primary and secondary windings and code-compliant performance under NEC Article 210-9, Exception 1, this ABB transformer delivers the flexibility and durability professionals expect for commercial and industrial electrical work, including outdoor and wet-location installations.

Manufacturer Resources

Product Specs

Product Type:
Transformer
Configuration:
NEMA 3R Enclosure
Standards:
NEC 210-9 Exception 1
Department:
Electrical
Product Group:
Wiring Devices
Product Subgroup:
Transformers

ABB 9T51B0107 – Frequently Asked Questions

1) What does a buck-boost transformer actually do, and when should I use one instead of a full isolation transformer?
A buck-boost transformer corrects a small voltage mismatch rather than supplying a whole load. The ABB 9T51B single-phase dry-type unit bucks (lowers) or boosts (raises) supply voltage by roughly 5 to 27 percent. If your 240V equipment is seeing 208V, or your line is running high enough to cook a motor, this is the fix. It is shipped as an insulating/isolating transformer with dual-voltage primary and dual-voltage secondary, then field-connected as an autotransformer for the buck or boost job. Use a full-capacity isolation transformer instead when you need true separation of primary and secondary, or when you are deriving a completely different voltage rather than trimming the one you have.
2) Can the ABB 9T51B buck-boost transformer be mounted outdoors?
Yes. The 9T51B ships in a NEMA 3R enclosure, which is the rating for outdoor and wet-location use. That means you can hang it on an exterior wall, at a rooftop unit, or in a damp mechanical yard without adding a separate weather housing.
3) Does using a buck-boost transformer as an autotransformer meet NEC requirements on a branch circuit?
When field-connected as an autotransformer, the ABB 9T51B complies with NEC Article 210-9, Exception 1. That exception is what permits an autotransformer connection on an existing branch circuit, which is why this is a common inspector-friendly fix on renovation and retrofit work where you cannot rewire the feeder.
4) Which voltage configurations does the ABB 9T51B buck-boost transformer come in?
Three ABB catalog numbers are offered. The 9T51B0011 is a 240 x 480 to 120/240 winding arrangement, and the 9T51B0112 is 120 x 240 to 12/24. The 9T51B0107 is the standard-configuration unit in the 9T51B0104/0107/0108/0109 rating group. Match the catalog number to the primary you are feeding and the secondary winding voltage you need to add or subtract, because the dual-voltage windings are what set the available buck and boost combinations in the field.
5) Will the ABB 9T51B work on a three-phase system?
No. The 9T51B is a single-phase unit. For three-phase voltage correction you would need multiple single-phase units connected in an open-delta or closed-delta bank, sized and connected per the manufacturer's connection diagram, not a single 9T51B.
6) Do I still need overcurrent protection and disconnecting means when installing a buck-boost transformer?
Yes, the transformer does not replace circuit protection. The 9T51B ships as the transformer in its NEMA 3R enclosure; the branch-circuit overcurrent device, disconnect, conductors, and any mounting hardware for the wall or unistrut are supplied separately and sized by the installing electrician to the connected load and the applicable NEC articles.
7) Is this ABB transformer rated for 60Hz, and what temperature rise does it carry?
The 9T51B is rated for 60Hz operation with a 40 degree temperature rating per ABB's specifications. It is a dry-type unit, so there is no oil to sample or contain and maintenance is limited to keeping the enclosure and ventilation clear.
How fast can I get the ABB 9T51B0107 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the ABB 9T51B0107 come with a warranty?
Absolutely. The ABB 9T51B0107 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the ABB 9T51B0107?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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