300 KVA Transformers

 

Bruce Electric supplies 300 kVA transformers in a wide range of standard and custom voltage configurations for commercial, industrial, infrastructure, OEM, utility, and international power distribution applications. Available configurations include step-down, step-up, isolation, delta-wye, and medium-voltage transformer designs with primary voltages such as 208V, 240V, 480V, 575V, 600V, 2400V, and 4160V, along with secondary voltages including 208Y/120V, 240/120V, 240D, 480Y/277V, 400Y/231V, 416Y/240V, 600V, and other specialty international voltage combinations.

 

Our team assists with transformer sizing, voltage matching, replacement transformer sourcing, and nationwide delivery support for commercial and industrial projects across the United States.

 

300 kVA Transformer Specifications

The specifications below represent common configurations available across 300 kVA dry type transformers. Actual specifications vary by manufacturer, enclosure type, impedance design, cooling method, and winding material. Always verify transformer nameplate data before installation.

Specification	Details
Power Rating	300 kVA (300,000 VA)
Transformer Type	Dry-Type (air-cooled)
Phase	Single-Phase (1Ø) and Three-Phase (3Ø)
Frequency	60 Hz
Winding Material	Copper or Aluminium
Temperature Rise	80°C, 115°C, and 150°C configurations available
Enclosure Types	NEMA 1, NEMA 2, NEMA 3R
Efficiency Compliance	DOE 10 CFR Part 431
Available Conditions	New online; used, surplus, and reconditioned available via RFQ
Common Applications	Commercial, industrial, utility, OEM, infrastructure, healthcare
Available Brands	GE, ABB, Eaton, Acme Electric, Hammond Power Solutions, Schneider Electric / Square D, SolaHD

 

Applications requiring voltage correction or isolation may also benefit from related solutions such as dry type transformers, buck-boost transformers, isolation transformers, panelboards, and UPS systems available from Bruce Electric.

DOE Efficiency Compliance for 300 kVA Transformers

All new 300 kVA dry type transformers sold in the United States must comply with DOE energy efficiency regulations under 10 CFR Part 431. Modern DOE-compliant transformers are designed to reduce core losses and improve operating efficiency in commercial and industrial electrical systems.

New, Used & Reconditioned 300 kVA Transformers

Bruce Electric supplies new 300 kVA dry type transformers online for commercial and industrial applications. Used, surplus, and reconditioned transformers are available upon request through our custom sourcing and RFQ process.

We support:

• Standard and specialty voltage configurations

• Step-up and step-down transformer applications

• Replacement transformer sourcing

• Obsolete and discontinued models

• Indoor and outdoor transformer applications

• Medium-voltage transformer requirements

• Delta-wye and reverse-feed configurations

• Nationwide shipping across the United States

For pricing, availability, and configuration assistance, submit an RFQ through Bruce Electric’s Request a Quote page or contact our team directly through the Contact Us page.

 

300 kVA Transformer Amps – Calculations and Output Table

The ampere output of a 300 kVA transformer depends on the voltage and number of phases.

Three-Phase Formula

I=300000/(V×1.732)

Single-Phase Formula

I=300000/V

 

Secondary Voltage	Phase	Output Current
208Y/120V	3Ø	~832 A
240V	3Ø	~722 A
480V	3Ø	~361 A
600V	3Ø	~289 A
240V	1Ø	~1,250 A
480V	1Ø	~625 A

Actual transformer current output varies based on voltage configuration, transformer design, connected load, and operating conditions. Always verify conductor sizing and overcurrent protection requirements according to NEC guidelines before installation.

 

Common 300 kVA Transformer Configurations

A 300 kVA transformer can be configured for a wide range of voltage conversion requirements depending on the application, facility distribution system, equipment voltage, and regional electrical standards. Common U.S. configurations include 480V to 208Y/120V and 480V to 480Y/277V, while industrial, utility, OEM, and international applications may require configurations such as 208V to 480Y/277V, 600V to 208Y/120V, 2400V to 480Y/277V, 4160V to 600V, or specialty delta/wye combinations.

Bruce Electric supplies both step-up and step-down 300 kVA dry type transformers for commercial distribution systems, industrial facilities, utility infrastructure, export equipment, and specialty electrical applications.

Step-Down Transformer Configurations

Primary Voltage	Secondary Voltage	Typical Application
480V	208Y/120V	Commercial panel distribution
480V	480Y/277V	Lighting and facility distribution
600V	208Y/120V	Industrial and Canadian systems
2400V	480Y/277V	Medium-voltage distribution
4160V	600V	Industrial power systems

Step-Up Transformer Configurations

Primary Voltage	Secondary Voltage	Typical Application
208V	480Y/277V	Powering 480V equipment
240V	480Y/277V	Industrial machinery
240V	416Y/240V	International equipment
208D	480Y	Delta-to-Wye conversion
480D	600Y	Utility and infrastructure systems

Most modern dry type transformers support reverse-feed operation when properly configured. Bruce Electric can help confirm compatibility for step-up or reverse-feed applications before purchase.

 

300 kVA Transformer Weight, Dimensions & Load Capacity

A 300 kVA transformer requires proper installation planning, floor loading evaluation, and NEC clearance compliance. Weight and dimensions vary depending on phase configuration, enclosure type, winding material, and manufacturer.

Typical Transformer Weight Ranges

Configuration	Approximate Weight
3Ø Copper Wound	1,800 – 3,200 lbs
3Ø Aluminum Wound	1,400 – 2,400 lbs
Single-Phase Copper	1,500 – 2,500 lbs
NEMA 3R Outdoor Units	Additional enclosure weight

Typical Transformer Dimensions

Configuration	Width	Depth	Height
300 kVA 3Ø NEMA 1	40-54″	28-38″	52-68″
300 kVA 3Ø NEMA 3R	44-58″	30-42″	56-72″

Actual dimensions vary by manufacturer and enclosure design. Bruce Electric can assist with specification sheets, outline drawings, and replacement transformer matching for project planning.

 

300 kVA Transformer Load Capacity

A 300 kVA transformer provides 300,000 VA of apparent power. Continuous loading is commonly limited to approximately 80% of nameplate capacity for thermal management and future load growth considerations.

• Nameplate Capacity: 300 kVA

• Recommended Continuous Load: ~240 kVA

• Typical Continuous Real Power at 0.8 PF: ~240 kW

• Typical Maximum Real Power at Unity PF: 300 kW

Need help selecting the correct transformer size for your facility or expansion project? Bruce Electric can assist with transformer sizing, voltage matching, and replacement recommendations

 

Applications of 300 kVA Dry Type Transformers

300 kVA transformers are widely used across commercial, industrial, infrastructure, OEM, and utility applications requiring dependable medium- and low-voltage power distribution.

Common applications include:

• Commercial office buildings

• Manufacturing and industrial facilities

• HVAC and mechanical systems

• Data centers and IT infrastructure

• Healthcare and medical facilities

• Educational campuses

• Transportation infrastructure

• Construction and temporary power applications

• Motor control centers and industrial process equipment

• International equipment integration

• OEM machinery systems

• Export manufacturing operations

Bruce Electric supplies dry type transformers for commercial, industrial, infrastructure, utility, and specialty electrical applications throughout the United States.

 

How to Select the Right 300 kVA Transformer

When selecting a 300 kVA transformer, consider:

• Load requirements and future expansion capacity

• Primary and secondary voltage compatibility

• Single-phase or three-phase requirements

• Indoor or outdoor installation environment

• Copper vs. aluminum winding preference

• DOE efficiency compliance requirements

• NEMA enclosure requirements

• Specialty voltage or international system compatibility

Applications requiring voltage correction or isolation may also benefit from related solutions such as dry type transformers, buck-boost transformers, isolation transformers, panelboards, and UPS systems available from Bruce Electric.

Contact Bruce Electric for assistance selecting the appropriate transformer configuration for your project requirements.

 

Frequently Asked Questions

Q1. How many amps is a 300 kVA transformer?

A 300 kVA transformer at 480V three-phase draws approximately 361 amps on the primary side. A 208Y/120V three-phase secondary provides approximately 832 amps at full load.

Q2. What is the price of a 300 kVA transformer?

Pricing varies based on voltage configuration, winding material, enclosure type, and manufacturer. Used and reconditioned units may also be available through Bruce Electric’s RFQ process.

Q3. What is a 300 kVA transformer used for?

300 kVA transformers are commonly used for commercial power distribution, HVAC systems, manufacturing facilities, data centers, healthcare applications, and industrial electrical systems.

Q4. How much does a 300 kVA transformer weigh?

Most 300 kVA dry type transformers weigh between approximately 1,400 and 3,200 lbs depending on configuration and enclosure type.

Q5. Can a 300 kVA transformer be used for both step-up and step-down applications?

Yes. Many dry type transformers can be configured for either step-up or step-down operation depending on system requirements and manufacturer specifications.