ABB - Electrification Signature Partner Distributor
ABB - Electrification 9T51B0140 - 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

9T51B0140

UPC: 783173009055


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Specification Sheet

Contact for Pricing

Overview

ABB's 9T51B0140 Single Phase Dry Type Buck-Boost Transformer (SKU: 9T51B0140) offers precise voltage adjustment for industrial and commercial power systems. This compact, dry-type distribution transformer is designed for flexibility, featuring dual-voltage primary (240x480V or 480V) and dual-voltage secondary (120/240V) configurations. It enables users to buck (lower) or boost (raise) supply voltages by 5% to 27%, ideal for fine-tuning power to sensitive equipment, lighting, or machinery where voltage stability is critical. Available in kVA ratings from 0.05 to 0.5kVA and operating at 50/60Hz, these transformers come in various frame sizes (e.g., 6100 for 0.05kVA, 10225 for 0.5kVA) with weights ranging from 6 to 20 lbs, simplifying installation. The dry-type construction eliminates oil containment needs and reduces maintenance. When field-connected as an autotransformer, it complies with NEC Article 210-9, Exception 1, providing a code-compliant voltage correction solution. Common applications include adjusting 480V to 240V for control panels, boosting 208V to 240V for equipment, correcting voltage drops in long cable runs, and meeting specific project voltage requirements. ABB's quality manufacturing ensures reliable performance and longevity. The 9T51B0140 ships as an insulating/isolating transformer but can be configured as an autotransformer for enhanced efficiency. Specific models include the 9T51B0502 (0.05kVA, 240x480V In, 120/240V Out, 6 lbs), 9T51B0548 (0.5kVA, 480V In, 120/240V Out, 20 lbs, with -2: 5.0% taps), 9T51B0007 (0.25kVA, 240x480V/480V In, 120/240V Out, 10 lbs), 9T51B0002 (0.05kVA, 240x480V/480V In, 120/240V Out, 6 lbs), 9T51B0008 (0.5kVA, 240x480V/480V In, 120/240V Out, 16 lbs), 9T51B0504 (0.1kVA, 240x480V In, 120/240V Out, 6 lbs), 9T51B0004 (0.1kVA, 240x480V/480V In, 120/240V Out, 6 lbs), 9T51B0005 (0.15kVA, 240x480V/480V In, 120/240V Out, 10 lbs), 9T51B0027 (0.25kVA, 120x240V In, 120/240V Out, 10 lbs), and 9T51B0022 (0.05kVA, 120x240V In, 120/240V Out, 6 lbs).
  • Single phase dry type buck-boost transformer for voltage adjustment
  • Dual voltage primary (240x480V or 480V) and secondary (120/240V)
  • Adjusts voltage by 5% to 27% (buck or boost)
  • Available in 0.05 to 0.5 kVA ratings
  • Complies with NEC Article 210-9, Exception 1 when field-connected as autotransformer

Specifications

Connection Type
Field-connectable as autotransformer
Connection Type
Field-connectable autotransformer
Connection Type
Field-configurable (autotransformer)
Enclosure
NEMA 3R
Frequency
50/60 Hz
Frequency
60 Hz
Frequency Rating
60 HZ
Frequency Rating, Maximum
60 Hz
Frequency Rating, Minimum
60 Hz
Height
9.62 in
Input Voltage
240 VAC
Insulation
IS-12
Material
Dry type (epoxy resin)
Material
Dry-type
Output Voltage
120
Phase
1
Poles
Single-Phase
Poles
Single Phase
Series
Buck-Boost
Series
9T51B
Size
6–20 lbs
Size
Compact
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
Temperature Rating, Maximum
104 F
Temperature Rating, Maximum
40 C
Temperature Rating, Minimum
104 F
Temperature Rating, Minimum
40 C
Voltage Rating
240/480V (input), 120/240V (output)
Wattage
2 KVA
Width
7.88 in
Package Dimensions (L x W x H)
11.25 IN x 10.75 IN x 9 IN
Package Dimensions (L x W x H)
28.575 cm x 27.305 cm x 22.86 cm
Package Weight (Imperial)
25.000 L
Package Weight (Metric)
11.340 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

Does the 9T51B0140 have adjustable taps?

No, the 9T51B0140 does not include adjustable taps.

What is the frequency rating for this transformer?

The transformer operates at 50/60Hz.

What input voltage ranges does the 9T51B0140 support?

The transformer supports 240x480V or 480V input voltages, depending on configuration.

What are the output voltage options for this transformer?

The secondary output is 120/240V, configurable based on wiring.

What kVA ratings are available for the 9T51B0140?

Available kVA ratings include 0.05, 0.1, 0.15, 0.25, and 0.5kVA.

What is the weight range for the 9T51B0140 series?

Weights range from 6 lbs (0.05kVA) to 20 lbs (0.5kVA).

Is the 9T51B0140 compliant with NEC standards?

Yes, when field-connected as an autotransformer, it meets NEC Article 210-9, Exception 1.

Can the 9T51B0140 be used to correct voltage drops?

Yes, it can boost voltage to compensate for drops in long cable runs.

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