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Low-voltage transformers

Breaker integrated transformer (BIT)

Eaton’s breaker integrated transformer (BIT) integrates a traditionally separate molded case circuit breaker (MCCB) and a low-voltage dry-type distribution transformer into a single factory-assembled, fully tested unit. BITs help reduce arc-flash hazards, overall footprint and cost of your electrical distribution system. BITs are available with most ventilated transformers’ options, in single and three-phase, and with configurations in combinations of primary or secondary, or both.

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Breaker integrated transformer (BIT) product aid Dry-type distribution transformers design guide
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Ratings
15 – 300 kVA
MCCB configurations
Primary, secondary, primary-secondary, and secondary-secondary
Winding conductor
Aluminum or copper

Core features

  • Replace the need for separate power distribution components with a fully enclosed molded-case circuit breaker (MCCB) integrated into Eaton’s proven low-voltage dry-type distribution transformer technology
  • Includes transformers with DOE 2016 and efficiency requirements, and transformers with other efficiency requirements
  • Take advantage of space savings with an integrated design that can save up to 30 percent compared to traditional, separately installed solutions
  • Easily configure to specific application needs with a wide range of primary, secondary, primary and secondary, or secondary and secondary breaker choices
  • Reduce hazard of arc flash
  • Transformers include a versatile bonding/grounding bar affixed to the bottom panel as standard, to provide compliance with NEC 450.10(A)

Breaker configurations

BIT transformers side view one breaker

Single breaker

Primary or secondary

BIT Transformer front view

Double breaker

Primary and secondary or

Secondary-secondary

BIT Transformers side view two breakers

Custom options

Contact Flex center:

DTDTflex@eaton.com

Save space up to 30% with breaker integrated transformers

BIT transformer layout

Example of BIT with the primary breaker shown: other configurations include a secondary breaker, primary and secondary breakers, or two secondary breakers.

Reduce cost, footprint and arc flash hazards

The combination of low-voltage transformers and close-coupled downstream panelboards can be effectively addressed with a breaker integrated transformer (BIT). BITs significantly reduce incident energy levels at the panel, are factory-assembled, and fully tested to help minimize the footprint and overall cost of your electrical distribution system.

Video topics

02:03 What is a breaker integrated transformer?
02:32 Why use a breaker integrated transformer?
03:30 Space savings
04:03 Feature offerings
04:58 Configuration
05:45 Flex Center customization options

Breaker integrated transformer FAQs

Frequently asked questions related to breaker integrated transformers.

Download FAQs

Reduce arc flash hazards on stepdown transformer applications

The secondary of a stepdown transformer is an area with high incident energy levels. And as transformer size increases, so does the incident energy level. Learn more about the benefits of integrating the secondary breaker from a panelboard into a stepdown transformer’s enclosure.
Download white paper
eaton-dtdt-bit-rethinking-stepdown-transformer-wp009004en-3d-image-left-grey-500x500.jpg

Customize your BIT through our Flex Center

For unique breaker integrated transformer requirements that standard offerings can't fulfill, Eaton’s Transformer Flex Center offers customized engineering and modification solutions. Our expert team of engineers is fully accessible to address your most critical application challenges.
Explore Transfomer Flex Center

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  • Transformer distribution catalog
    Volume 2, Tab 2 - This catalog contains product details and ordering information for Eaton’s low-voltage dry-type transformers.
    (PDF 3 MB , 12/18/2024)
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Sales support email
DTDT Flex Center (DTDTflex@eaton.com)
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