ABB - Electrification Signature Partner Distributor
ABB - Electrification 9T51B0207 - ABB's Buck-boost transformers are small, single phase, dry type distribution transformers designed and shipped as insulating/isolating transformers. They have a dual voltage primary and a dual voltage secondary. These transformers can be connected for a wide range of voltage combinations. The most common use is to buck (lower) or boost (raise) the supply voltage a small amount, usually 5 to 27%. Buck boost transformers comply with NEC Article 210-9, Exception 1, when field connected as an autotransformer.
ABB - Electrification

9T51B0207

UPC: 783173014448

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Specification Sheet

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Overview

ABB’s 9T51B0207 Buck-Boost Transformer (SKU: 9T51B0207) is a compact, single-phase, dry-type distribution transformer engineered for precise voltage adjustment in industrial and commercial applications. Shipped as an insulating/isolating transformer, it features dual-voltage primaries and secondaries, enabling flexible voltage combinations for buck (lowering) or boost (raising) operations within a 5% to 27% range. This transformer is ideal for correcting minor voltage discrepancies to ensure optimal equipment performance and longevity. Designed for field connection as an autotransformer, the 9T51B0207 complies with NEC Article 210-9, Exception 1, meeting critical safety and regulatory standards. Its dry-type construction eliminates the need for liquid insulation, enhancing safety, reducing maintenance, and minimizing environmental risks. The transformer’s 105 insulation system and 55°C temperature rise ensure reliable operation under demanding conditions, while integrated primary and secondary fusing (with holders and clips) provide essential overcurrent protection. Key applications include correcting voltage drops in long cable runs, stabilizing power for sensitive equipment, and adapting non-standard voltages to meet equipment requirements. Common uses span manufacturing plants, data centers, commercial buildings, and renewable energy systems where voltage stability is critical. The transformer’s versatility allows for quick installation and field-configurable connections, reducing downtime and operational disruptions. Manufactured in the USA by ABB - Electrification, the 9T51B0207 is built to deliver consistent performance with minimal maintenance. Its compact design and UL/CSA certifications make it a trusted choice for engineers and facility managers seeking a dependable solution for voltage regulation. Whether adjusting 120V to 127V or 240V to 228V, this transformer provides a cost-effective, code-compliant method for fine-tuning power distribution systems.
  • Single-phase, dry-type distribution transformer for precise voltage adjustment (5-27%)
  • Dual-voltage primary and secondary for flexible voltage combinations
  • Complies with NEC Article 210-9, Exception 1 when field-connected as an autotransformer
  • 105 insulation system, 55°C temperature rise, UL/CSA certified
  • Integrated primary and secondary fusing with holders and clips for overcurrent protection

Specifications

Enclosure
NEMA 3R
Frequency Rating
60 HZ
Height
7.38 in
Input Voltage
240x480
Insulation
IS-12
Output Voltage
24/48
Phase
1
Special Features
ABB's Buck-boost transformers are small, single phase, dry type distribution transformers designed and shipped as insulating/isolating transformers. They have a dual voltage primary and a dual voltage secondary. These transformers can be connected for a wide range of voltage combinations. The most common use is to buck (lower) or boost (raise) the supply voltage a small amount, usually 5 to 27%. Buck boost transformers comply with NEC Article 210-9, Exception 1, when field connected as an autotransformer.
Standard
Yes
Temperature Rating
40 °C
Wattage
0.25 KVA
Width
6.12 in
Package Dimensions (L x W x H)
4.25 IN x 6.12 IN x 7.38 IN
Package Dimensions (L x W x H)
10.795 cm x 15.5448 cm x 18.7452 cm
Package Weight (Imperial)
10.000 L
Package Weight (Metric)
4.536 kg
ABB's Buck-boost transformers are small, single phase, dry type distribution transformers designed and shipped as insulating/isolating transformers. They have a dual voltage primary and a dual voltage secondary. These transformers can be connected for a wide range of voltage combinations. The most common use is to buck (lower) or boost (raise) the supply voltage a small amount, usually 5 to 27%. Buck boost transformers comply with NEC Article 210-9, Exception 1, when field connected as an autotransformer.

9T51B0107

ABB's Buck-boost transformers are small, single phase, dry type distribution transformers designed and shipped as insulating/isolating transformers. They have a dual voltage primary and a dual voltage secondary. These transformers can be connected for a wide range of voltage combinations. The most common use is to buck (lower) or boost (raise) the supply voltage a small amount, usually 5 to 27%. Buck boost transformers comply with NEC Article 210-9, Exception 1, when field connected as an autotransformer.
Buck Boost Transformers, 0.25 KVA, Maximum Secondary Amperage: 20.8 at 12V, 10.4 at 24V, 120 x 240 Volt Primary, 12/24 Volt Secondary

HS19B250

Buck Boost Transformers, 0.25 KVA, Maximum Secondary Amperage: 20.8 at 12V, 10.4 at 24V, 120 x 240 Volt Primary, 12/24 Volt Secondary
600V Class Commercial Encapsulated Single Phase Buck-Boost/Isolation Transformer, 120x240 PV, 16x32 SV, 2000 VA

Q002ESCF

600V Class Commercial Encapsulated Single Phase Buck-Boost/Isolation Transformer, 120x240 PV, 16x32 SV, 2000 VA
ABB's Buck-boost transformers are small, single phase, dry type distribution transformers designed and shipped as insulating/isolating transformers. They have a dual voltage primary and a dual voltage secondary. These transformers can be connected for a wide range of voltage combinations. The most common use is to buck (lower) or boost (raise) the supply voltage a small amount, usually 5 to 27%. Buck boost transformers comply with NEC Article 210-9, Exception 1, when field connected as an autotransformer.

9T51B0208

ABB's Buck-boost transformers are small, single phase, dry type distribution transformers designed and shipped as insulating/isolating transformers. They have a dual voltage primary and a dual voltage secondary. These transformers can be connected for a wide range of voltage combinations. The most common use is to buck (lower) or boost (raise) the supply voltage a small amount, usually 5 to 27%. Buck boost transformers comply with NEC Article 210-9, Exception 1, when field connected as an autotransformer.
ABB's Buck-boost transformers are small, single phase, dry type distribution transformers designed and shipped as insulating/isolating transformers. They have a dual voltage primary and a dual voltage secondary. These transformers can be connected for a wide range of voltage combinations. The most common use is to buck (lower) or boost (raise) the supply voltage a small amount, usually 5 to 27%. Buck boost transformers comply with NEC Article 210-9, Exception 1, when field connected as an autotransformer.

9T51B0204

ABB's Buck-boost transformers are small, single phase, dry type distribution transformers designed and shipped as insulating/isolating transformers. They have a dual voltage primary and a dual voltage secondary. These transformers can be connected for a wide range of voltage combinations. The most common use is to buck (lower) or boost (raise) the supply voltage a small amount, usually 5 to 27%. Buck boost transformers comply with NEC Article 210-9, Exception 1, when field connected as an autotransformer.
ABB's Buck-boost transformers are small, single phase, dry type distribution transformers designed and shipped as insulating/isolating transformers. They have a dual voltage primary and a dual voltage secondary. These transformers can be connected for a wide range of voltage combinations. The most common use is to buck (lower) or boost (raise) the supply voltage a small amount, usually 5 to 27%. Buck boost transformers comply with NEC Article 210-9, Exception 1, when field connected as an autotransformer.

9T51B0205

ABB's Buck-boost transformers are small, single phase, dry type distribution transformers designed and shipped as insulating/isolating transformers. They have a dual voltage primary and a dual voltage secondary. These transformers can be connected for a wide range of voltage combinations. The most common use is to buck (lower) or boost (raise) the supply voltage a small amount, usually 5 to 27%. Buck boost transformers comply with NEC Article 210-9, Exception 1, when field connected as an autotransformer.
ABB's Buck-boost transformers are small, single phase, dry type distribution transformers designed and shipped as insulating/isolating transformers. They have a dual voltage primary and a dual voltage secondary. These transformers can be connected for a wide range of voltage combinations. The most common use is to buck (lower) or boost (raise) the supply voltage a small amount, usually 5 to 27%. Buck boost transformers comply with NEC Article 210-9, Exception 1, when field connected as an autotransformer.

9T51B0210

ABB's Buck-boost transformers are small, single phase, dry type distribution transformers designed and shipped as insulating/isolating transformers. They have a dual voltage primary and a dual voltage secondary. These transformers can be connected for a wide range of voltage combinations. The most common use is to buck (lower) or boost (raise) the supply voltage a small amount, usually 5 to 27%. Buck boost transformers comply with NEC Article 210-9, Exception 1, when field connected as an autotransformer.
ABB's Buck-boost transformers are small, single phase, dry type distribution transformers designed and shipped as insulating/isolating transformers. They have a dual voltage primary and a dual voltage secondary. These transformers can be connected for a wide range of voltage combinations. The most common use is to buck (lower) or boost (raise) the supply voltage a small amount, usually 5 to 27%. Buck boost transformers comply with NEC Article 210-9, Exception 1, when field connected as an autotransformer.

9T51B0209

ABB's Buck-boost transformers are small, single phase, dry type distribution transformers designed and shipped as insulating/isolating transformers. They have a dual voltage primary and a dual voltage secondary. These transformers can be connected for a wide range of voltage combinations. The most common use is to buck (lower) or boost (raise) the supply voltage a small amount, usually 5 to 27%. Buck boost transformers comply with NEC Article 210-9, Exception 1, when field connected as an autotransformer.

Frequently Asked Questions

What type of transformer is the 9T51B0207?

The ABB 9T51B0207 is a buck boost autotransformer, designed as a small, single-phase, dry-type distribution transformer.

What is the typical use for buck boost autotransformers?

The most common use is to buck (lower) or boost (raise) the supply voltage a small amount, usually 10%.

What material is the coil made of?

The coil material for this transformer is copper (CU).

What is the operating frequency of this transformer?

The operating frequency for this transformer is 60 Hz.

What is the enclosure type of this transformer?

The enclosure type for this transformer is NEMA 3R.

Does this transformer comply with NEC Article 450?

This transformer complies with NEC Article 450 Exception when field connected as an autotransformer.

Frequently Asked Questions about ABB - Electrification

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ABB - Electrification products comply with a comprehensive range of international certifications and standards, including UL (United States), CSA (Canada), CE (European Community), UKCA (United Kingdom), EAC (Russia), and C-Tick (Australia & New Zealand). Our products meet critical international standards such as IEC 60947 series for low-voltage switchgear, functional safety standards EN 61800-5-2 and ISO 13849-1, and marine classification standards from Bureau Veritas, DNV, and Lloyd's Register of Shipping.

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ABB - Electrification offers comprehensive technical support through multiple channels, including a dedicated technical support hotline at 888-385-1221 (Option 1), available 7:00 a.m. - 5:00 p.m. CST, Monday-Friday. Their support services encompass 24/7/365 emergency services, on-site support, remote monitoring and diagnostics, installation and commissioning, equipment assessments, repair coordination, and multi-vendor technical assistance. Customers can also access resources like personnel safety training, disaster recovery support, and service agreements tailored to their specific electrification needs.

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