ABB - Electrification Signature Partner Distributor
ABB - Electrification 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 - Electrification

9T51B0210

UPC: 783173036815


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Specification Sheet

Contact for Pricing

Overview

ABB's 9T51B0210 Buck-Boost Transformer is a compact, single-phase, dry-type distribution transformer designed for precise voltage adjustment in electrical systems. This 0.05 kVA unit delivers 120/240V output with a dual-voltage primary (240 x 480V) and secondary, enabling flexible installation across a wide range of voltage combinations. Weighing just 6 lbs and measuring 6100 frame size, it is optimized for applications requiring minimal voltage correction while maintaining compliance with NEC Article 210-9, Exception 1 when field-connected as an autotransformer. The dry-type construction eliminates oil hazards, reduces maintenance, and ensures safe operation in environments where oil-filled transformers are impractical. Commonly used to buck (lower) or boost (raise) supply voltage by 5% to 27%, this transformer is ideal for correcting minor voltage fluctuations in lighting, HVAC, and small motor loads. Its lightweight design and simple wiring (Wiring Diagram No. 1) make it a cost-effective solution for retrofits, new installations, or temporary setups. Manufactured in the USA, the 9T51B0210 is part of ABB's reliable buck-boost transformer line, offering engineers and contractors a dependable tool for voltage stabilization without oversizing or overcomplicating the system. For applications requiring higher kVA ratings, ABB offers compatible models such as the 0.1 kVA (9T51B0504), 0.25 kVA (9T51B0007), and 0.5 kVA (9T51B0548) variants, each tailored to specific load requirements and input voltages (e.g., 480V or 600V).
  • 0.05 kVA single-phase dry-type transformer with 120/240V output
  • Dual-voltage primary (240 x 480V) and secondary for flexible wiring
  • Weighs 6 lbs with 6100 frame size for easy handling
  • Complies with NEC Article 210-9, Exception 1 when used as an autotransformer
  • Wiring Diagram No. 1 for straightforward installation

Specifications

Enclosure
NEMA 3R
Frequency Rating
60 HZ
Height
9.62 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
1 KVA
Width
7.88 in
Package Dimensions (L x W x H)
5.5 IN x 7.88 IN x 9.62 IN
Package Dimensions (L x W x H)
13.97 cm x 20.0152 cm x 24.4348 cm
Package Weight (Imperial)
30.000 L
Package Weight (Metric)
13.608 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

What is the catalog number for this ABB transformer?

The catalog number for this specific transformer is 9T51B0210.

What type of transformer is the 9T51B0210?

The 9T51B0210 is a small, single-phase, dry-type distribution transformer designed as an insulating/isolating transformer.

What is the coil material used in this transformer?

The coil material used in this transformer is copper (CU).

What is the enclosure type of this transformer?

The enclosure type for this transformer is NEMA 3R.

Is this transformer UL listed?

Yes, this transformer is UL listed.

Is this transformer cUL listed?

Yes, this transformer is cUL listed.

What is a common application for this buck boost transformer?

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

What is the primary and secondary voltage of this transformer?

This transformer has a dual voltage primary and a dual voltage secondary, allowing for a wide range of voltage combinations.

Does this transformer comply with NEC Article 450?

Yes, this transformer complies with NEC Article 450, Exception 1, when field connected as an autotransformer.

What is the temperature rise rating for this transformer?

The temperature rise rating for this transformer is 150 degrees Celsius.

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