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ABB - Electrification 9T76H9872G03 - ABB's Guard III Harmonic Mitigating Transformers (HMT) help eliminate harmonics, improve power quality, and help save energy by reducing the energy (heating) losses associated with harmonic activity. They maintain DOE 2016 energy efficiency even when harmonics are present. The HMT's are UL Listed and are available in common phase shifts with zigzag transformer secondaries. Qualified to the seismic requirements of IEEE-693-2005 and IBC-2021 and CBC 2022.
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ABB - Electrification

9T76H9872G03

UPC: 783173252284

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Specification Sheet

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Overview

ABB Guard III Harmonic Mitigating Transformers (HMT) (SKU: 9T76H9872G03) are three-phase, zig-zag secondary transformers engineered to actively reduce current harmonics on the primary side and voltage distortion on the secondary. Designed for environments with significant non-linear loads—such as data centers, medical facilities, office buildings, and schools—the Guard III HMT maintains DOE 2016 energy efficiency standards even under harmonic conditions, reducing energy losses from heating and improving overall system efficiency. Key features include dual electrostatic shields, a heat-cured ASA-61 gray powder coating finish, and a NEMA 2 enclosure for protection. The transformer is available in a kVA range from 15 to 1,500 kVA, with 0° and -30° phase shifts to mitigate triplen harmonics (3rd, 9th, 15th, 21st) and, when paired, reduce 5th and 7th harmonics. Constructed with high-quality electrical steel cores and copper windings, it offers robust durability and reliable performance. Standard specifications include a 480V primary, 208Y/120V zig-zag secondary voltage, 150°C temperature rise, and a 220°C insulation class. The Guard III HMT is qualified to seismic requirements of IEEE-693-2005, IBC-2021, and CBC 2022, making it ideal for critical applications where stable power is paramount. The transformer's dual electrostatic shields provide additional protection against harmonic interference, while the heat-cured ASA-61 gray powder coating ensures long-term resistance to corrosion and environmental factors. The NEMA 2 enclosure offers protection against dust and light splashing, suitable for both indoor and outdoor installations. With a wide kVA range and flexible phase shift options, the Guard III HMT can be tailored to meet the specific demands of various applications, from small office buildings to large industrial facilities.
  • Three-phase, zig-zag secondary transformer for harmonic mitigation
  • Dual electrostatic shields and heat-cured ASA-61 gray powder coating
  • NEMA 2 enclosure for dust and light splashing protection
  • Available in 15-1500 kVA range with 0° and -30° phase shifts
  • UL and CSA Listed, qualified to IEEE-693-2005, IBC-2021, and CBC 2022 seismic standards

Specifications

Color
Gray
Connection Type
Zig-zag secondary
Current Rating
15-1500 kVA
Efficiency
DOE 2016
Enclosure
NEMA 2
Frequency
60 Hz
Frequency Rating
60 HZ
Ip Rating
NEMA 3R
K Factor
K1
KVA Rating
30 KVA
Material
Electrical Steel, Copper
Material
ASA-61 powder coating, electrical steel, copper
NEMA Rating
NEMA 3R
Phase
3
Poles
3-Phase
Primary Voltage
480 VAC
Secondary Voltage
208Y/120
Series
Guard III Harmonic Mitigating Transformers (HMT)
Series
Guard III HMT
Size
15-1500 kVA
Special Features
ABB's Guard III™ Harmonic Mitigating Transformers help eliminate harmonics, improve power quality, and help save energy by reducing the energy (heating) losses. They maintain DOE2016 energy efficiency even when harmonics are present.
Standard
No
Temperature Rating
40 °C
Voltage Rating
480V/208Y/120V
Package Weight (Imperial)
0.001 L
Package Weight (Metric)
0.001 kg
ABB's Guard III Harmonic Mitigating Transformers (HMT) help eliminate harmonics, improve power quality, and help save energy by reducing the energy (heating) losses associated with harmonic activity. They maintain DOE 2016 energy efficiency even when harmonics are present. The HMT's are UL Listed and are available in common phase shifts with zigzag transformer secondaries. Qualified to the seismic requirements of IEEE-693-2005 and IBC-2021 and CBC 2022.

9T76H9871G03

ABB's Guard III Harmonic Mitigating Transformers (HMT) help eliminate harmonics, improve power quality, and help save energy by reducing the energy (heating) losses associated with harmonic activity. They maintain DOE 2016 energy efficiency even when harmonics are present. The HMT's are UL Listed and are available in common phase shifts with zigzag transformer secondaries. Qualified to the seismic requirements of IEEE-693-2005 and IBC-2021 and CBC 2022.
ABB's Guard III Harmonic Mitigating Transformers (HMT) help eliminate harmonics, improve power quality, and help save energy by reducing the energy (heating) losses associated with harmonic activity. They maintain DOE 2016 energy efficiency even when harmonics are present. The HMT's are UL Listed and are available in common phase shifts with zigzag transformer secondaries. Qualified to the seismic requirements of IEEE-693-2005 and IBC-2021 and CBC 2022.

9T77H9876G03

ABB's Guard III Harmonic Mitigating Transformers (HMT) help eliminate harmonics, improve power quality, and help save energy by reducing the energy (heating) losses associated with harmonic activity. They maintain DOE 2016 energy efficiency even when harmonics are present. The HMT's are UL Listed and are available in common phase shifts with zigzag transformer secondaries. Qualified to the seismic requirements of IEEE-693-2005 and IBC-2021 and CBC 2022.
ABB's Guard III Harmonic Mitigating Transformers (HMT) help eliminate harmonics, improve power quality, and help save energy by reducing the energy (heating) losses associated with harmonic activity. They maintain DOE 2016 energy efficiency even when harmonics are present. The HMT's are UL Listed and are available in common phase shifts with zigzag transformer secondaries. Qualified to the seismic requirements of IEEE-693-2005 and IBC-2021 and CBC 2022.

9T76H9873G03

ABB's Guard III Harmonic Mitigating Transformers (HMT) help eliminate harmonics, improve power quality, and help save energy by reducing the energy (heating) losses associated with harmonic activity. They maintain DOE 2016 energy efficiency even when harmonics are present. The HMT's are UL Listed and are available in common phase shifts with zigzag transformer secondaries. Qualified to the seismic requirements of IEEE-693-2005 and IBC-2021 and CBC 2022.
ABB's Guard III Harmonic Mitigating Transformers (HMT) help eliminate harmonics, improve power quality, and help save energy by reducing the energy (heating) losses associated with harmonic activity. They maintain DOE 2016 energy efficiency even when harmonics are present. The HMT's are UL Listed and are available in common phase shifts with zigzag transformer secondaries. Qualified to the seismic requirements of IEEE-693-2005 and IBC-2021 and CBC 2022.

9T76H9875G03

ABB's Guard III Harmonic Mitigating Transformers (HMT) help eliminate harmonics, improve power quality, and help save energy by reducing the energy (heating) losses associated with harmonic activity. They maintain DOE 2016 energy efficiency even when harmonics are present. The HMT's are UL Listed and are available in common phase shifts with zigzag transformer secondaries. Qualified to the seismic requirements of IEEE-693-2005 and IBC-2021 and CBC 2022.
ABB's Guard III Harmonic Mitigating Transformers (HMT) help eliminate harmonics, improve power quality, and help save energy by reducing the energy (heating) losses associated with harmonic activity. They maintain DOE 2016 energy efficiency even when harmonics are present. The HMT's are UL Listed and are available in common phase shifts with zigzag transformer secondaries. Qualified to the seismic requirements of IEEE-693-2005 and IBC-2021 and CBC 2022.

9T76H9876G03

ABB's Guard III Harmonic Mitigating Transformers (HMT) help eliminate harmonics, improve power quality, and help save energy by reducing the energy (heating) losses associated with harmonic activity. They maintain DOE 2016 energy efficiency even when harmonics are present. The HMT's are UL Listed and are available in common phase shifts with zigzag transformer secondaries. Qualified to the seismic requirements of IEEE-693-2005 and IBC-2021 and CBC 2022.
ABB's Guard III Harmonic Mitigating Transformers (HMT) help eliminate harmonics, improve power quality, and help save energy by reducing the energy (heating) losses associated with harmonic activity. They maintain DOE 2016 energy efficiency even when harmonics are present. The HMT's are UL Listed and are available in common phase shifts with zigzag transformer secondaries. Qualified to the seismic requirements of IEEE-693-2005 and IBC-2021 and CBC 2022.

9T76H9874G03

ABB's Guard III Harmonic Mitigating Transformers (HMT) help eliminate harmonics, improve power quality, and help save energy by reducing the energy (heating) losses associated with harmonic activity. They maintain DOE 2016 energy efficiency even when harmonics are present. The HMT's are UL Listed and are available in common phase shifts with zigzag transformer secondaries. Qualified to the seismic requirements of IEEE-693-2005 and IBC-2021 and CBC 2022.
ABB's Guard III Harmonic Mitigating Transformers (HMT) help eliminate harmonics, improve power quality, and help save energy by reducing the energy (heating) losses associated with harmonic activity. They maintain DOE 2016 energy efficiency even when harmonics are present. The HMT's are UL Listed and are available in common phase shifts with zigzag transformer secondaries. Qualified to the seismic requirements of IEEE-693-2005 and IBC-2021 and CBC 2022.

9T77H9873G03

ABB's Guard III Harmonic Mitigating Transformers (HMT) help eliminate harmonics, improve power quality, and help save energy by reducing the energy (heating) losses associated with harmonic activity. They maintain DOE 2016 energy efficiency even when harmonics are present. The HMT's are UL Listed and are available in common phase shifts with zigzag transformer secondaries. Qualified to the seismic requirements of IEEE-693-2005 and IBC-2021 and CBC 2022.
ABB's Guard III Harmonic Mitigating Transformers (HMT) help eliminate harmonics, improve power quality, and help save energy by reducing the energy (heating) losses associated with harmonic activity. They maintain DOE 2016 energy efficiency even when harmonics are present. The HMT's are UL Listed and are available in common phase shifts with zigzag transformer secondaries. Qualified to the seismic requirements of IEEE-693-2005 and IBC-2021 and CBC 2022.

9T77H9874G03

ABB's Guard III Harmonic Mitigating Transformers (HMT) help eliminate harmonics, improve power quality, and help save energy by reducing the energy (heating) losses associated with harmonic activity. They maintain DOE 2016 energy efficiency even when harmonics are present. The HMT's are UL Listed and are available in common phase shifts with zigzag transformer secondaries. Qualified to the seismic requirements of IEEE-693-2005 and IBC-2021 and CBC 2022.

Frequently Asked Questions

What kVA range does the Guard III HMT support?

The transformer is available in a kVA range from 15 to 1,500 kVA.

Is the Guard III HMT UL Listed?

Yes, the transformer is UL and CSA Listed.

What seismic standards does the Guard III HMT meet?

It is qualified to IEEE-693-2005, IBC-2021, and CBC 2022 seismic requirements.

What is the operating voltage range for the Guard III HMT?

The primary voltage is 480V, and the secondary voltage is 208Y/120V.

Does the Guard III HMT meet DOE 2016 energy efficiency standards?

Yes, it maintains DOE 2016 energy efficiency even under harmonic conditions.

What is the temperature rise rating for the Guard III HMT?

The transformer has a 150°C temperature rise rating.

Is the Guard III HMT suitable for outdoor installations?

Yes, it features a NEMA 3R enclosure for outdoor protection.

What materials are used in the construction of the Guard III HMT?

The transformer is constructed with high-quality electrical steel cores and copper windings.

What phase shifts are available for the Guard III HMT?

The transformer is available with 0° and -30° phase shifts to mitigate specific harmonics.

What insulation class does the Guard III HMT use?

The transformer uses a 220°C insulation class.

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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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