ABB - Electrification Signature Partner Distributor
ABB - Electrification 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.
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ABB - Electrification

9T51B0208

UPC: 783173014455


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Specification Sheet

Contact for Pricing

Overview

ABB’s **Buck-Boost Transformer (SKU: 9T51B0208)** is a single-phase, dry-type distribution transformer designed for precise voltage regulation in industrial, commercial, and institutional settings. It functions as an insulating/isolating transformer with dual-voltage primary and secondary windings, allowing voltage adjustment typically between 5% and 27% to compensate for supply fluctuations or match equipment requirements. Key features include: - **Dual-voltage primary and secondary**: Supports a wide range of voltage combinations (e.g., 120/240V, 240/480V) for flexible installation and retrofitting in existing systems. - **Dry-type construction**: Eliminates liquid insulation, reducing maintenance and environmental risks while enhancing reliability in harsh or indoor environments. Rated 105°C insulation system ensures thermal durability. - **NEC compliance**: Meets NEC Article 210-9, Exception 1 when field-connected as an autotransformer, ensuring safe and compliant operation. - **Built-in fuse protection**: Primary fuse holders (2x) and secondary fuse clips (1x) enhance safety and ease of maintenance. - **Compact design**: Small footprint for easy integration into existing systems without requiring additional space. - **UL and CSA certified**: Ensures safety and performance standards for North American markets. Common applications include: - **Lighting systems**: Stabilizes voltage for consistent illumination in commercial and industrial spaces, preventing flickering or premature lamp failure. - **HVAC equipment**: Protects sensitive HVAC components from voltage fluctuations, extending equipment lifespan and improving efficiency. - **Industrial machinery**: Ensures tight power tolerances for reliable operation of critical equipment, reducing downtime and maintenance costs. - **Data centers and critical infrastructure**: Provides stable power for sensitive electronic systems, safeguarding against voltage sags or surges.
  • Single-phase, dry-type transformer for precise voltage regulation
  • Dual-voltage primary and secondary for flexible installation
  • Dry-type insulation (105°C) for reliability in harsh environments
  • Built-in fuse holders (primary: 2, secondary: 1) for enhanced safety
  • UL and CSA certified for North American compliance

Specifications

Connection Type
Field-connected as autotransformer
Enclosure
NEMA 3R
Frequency Rating
60 HZ
Height
8.38 in
Input Voltage
240x480
Insulation
IS-12
Material
Dry-type insulation
Output Voltage
24/48
Phase
1
Poles
Single-Phase
Series
Buck-Boost
Size
Small
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
0.5 KVA
Width
6.88 in
Package Dimensions (L x W x H)
4.88 IN x 6.88 IN x 8.38 IN
Package Dimensions (L x W x H)
12.3952 cm x 17.4752 cm x 21.2852 cm
Package Weight (Imperial)
20.000 L
Package Weight (Metric)
9.072 kg
A - 15.0 kV bushing

015J0400AN

A - 15.0 kV bushing
O Plus C - 34.5 kV bushing

034Z3000AW

O Plus C - 34.5 kV bushing

Frequently Asked Questions

Is the 9T51B0208 UL and CSA certified?

Yes, the transformer is UL and CSA certified, meeting North American safety standards for electrical equipment.

What voltage adjustments does the 9T51B0208 support?

The transformer adjusts voltage by 5% to 27%, either bucking (lowering) or boosting (raising) supply voltage to compensate for fluctuations or match equipment requirements.

What is the insulation system rating for the 9T51B0208?

The insulation system is rated 105°C, ensuring reliable performance in high-temperature environments.

How many fuse holders does the 9T51B0208 have?

The transformer includes 2 primary fuse holders and 1 secondary fuse holder for enhanced safety and circuit protection.

Can the 9T51B0208 be used as an autotransformer?

Yes, when field-connected as an autotransformer, it complies with NEC Article 210-9, Exception 1 for voltage adjustment applications.

What are the typical applications for the 9T51B0208?

Common uses include lighting systems, HVAC equipment, industrial machinery, and data centers where stable voltage is critical.

Is the 9T51B0208 suitable for indoor use?

Yes, its dry-type construction makes it ideal for indoor environments, eliminating risks associated with liquid insulation.

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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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