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15 kVA Transformers

A 15 kVA dry type transformer is one of the most widely specified sizes in commercial and light industrial electrical work, used for stepping down 480V building service to 208Y/120V for panel distribution, feeding lighting and HVAC control circuits, powering machine tool feeders, and supporting branch distribution in tenant fit-outs, institutional facilities, and construction projects where a compact, reliable voltage conversion solution is required.

At Bruce Electric Equipment Corp., we supply new, used and reconditioned 15 kVA transformers in single phase and three phase configurations. Since 1973, Bruce Electric has specialized in dry type transformers and electrical distribution equipment from leading manufacturers including Acme Electric, Hammond Power Solutions (HPS), Eaton and more. Our team can help source the right unit for your application. We offer fast nationwide shipping across the United States along with technical support.

Technical Specifications

Parameter	Available Options
Phase	Single-Phase, Three-Phase
Frequency	60 Hz (standard); 50/60 Hz (export models); 50 Hz
Primary Voltage	120V – 4160V (model-dependent)
Winding Material	Aluminium or Copper
Temperature Rise	80°C, 115°C, 130°C, 135°C, 150°C, 180°C
Enclosure	NEMA 1, NEMA 2, NEMA 3R, NEMA 3R Encapsulated, NEMA 3R Heavy Duty, NEMA 3R Stainless Steel, Encapsulated
Insulation Class	Class H (220°C) standard for 150°C rise units
Taps	Varies by model; 2–6 taps at 2.5% FCAN/FCBN typical

Available 15 kVA Transformers Voltage Configurations

Bruce Electric’s 15 kVA inventory covers a broader range of voltage configurations than most distributors carry across all kVA ratings combined. The following are confirmed from actual inventory.

Three-Phase Configurations

Primary Voltage	Secondary Voltage	Application
480V	208Y/120V	192 SKUs – North American commercial step-down; feeds 208V/120V tenant and floor panels
208V	208Y/120V	Step-down where 208V is the building service; maintains 208Y/120V distribution
600V	208Y/120V	Canadian commercial and industrial facilities; most common Canadian config
480V	480Y/277V	Establishes neutral on delta 480V source; 277V for commercial lighting ballasts and LED drivers
208V	480Y/277V	Step-up from 208V service to feed 480V equipment
240V	208Y/120V	Step-down from lower-voltage service; commercial and light industrial
600V	480Y/277V	Canadian facilities requiring 277V lighting distribution
480V	240V	Delta secondary applications; ungrounded 240V three-phase loads
480V	240/120V	Delta-secondary with center-tap for 120V single-phase loads
480V delta	208Y/120V	Delta primary to wye secondary; industrial delta-source facilities
240V	480Y/277V	Step-up from 240V service to 480Y/277V for mixed lighting/equipment feeds
480V	400Y/231V	International equipment requiring IEC-standard voltage
380V	208Y/120V	European/international primary to North American secondary
415V	208Y/120V	UK and international primary to North American secondary
440V	220Y/127V	Export and international three-phase applications
460V	230Y/133V	International step-down, export OEM equipment
208V	480V	Step-up for 480V equipment from 208V service
208V	400Y/231V	International secondary from North American primary
2400V	208Y/120V, 480Y/277V, 600Y	Medium voltage distribution to LV utilization
4160V	208Y/120V, 480Y/277V, 600Y	MV utility step-down at point of load

Single-Phase Configurations

Primary Voltage	Secondary Voltage	Application
240 × 480V	120/240V	Dual-primary step-down; most common single-phase config (25 SKUs)
600V	120/240V	Canadian single-phase service to 120/240V
208V	120/240V	Single-phase step-down from 208V panel
480V	120/240V	Single-phase step-down from 480V service
277V	120/240V	Step-down from 277V lighting circuit to 120V
120/208/240/277V	120/240V	Multi-tap primary; maximum installation flexibility
190/200/208/220V	120/240V	International multi-tap, export applications
2400V	120/240V	Medium voltage single-phase to 120/240V
4160V	120/240V	MV single-phase step-down

How Many Amps Can a 15 kVA Transformer Handle?

Full-load amperage is determined by the secondary voltage and phase configuration. Use these formulas:

Single-phase: FLA = 15,000 ÷ Secondary Voltage

Three-phase: FLA = 15,000 ÷ (Secondary Voltage × 1.732)

15 kVA Transformer Amperage Reference Table:

Configuration	Secondary Voltage	Full Load Amps (FLA)
Single Phase	120V	125.0 A
Single Phase	240V	62.5 A
Single Phase	277V	54.2 A
Three Phase	208Y/120V	41.6 A
Three Phase	240V	36.1 A
Three Phase	480V	18.0 A
Three Phase	480Y/277V	18.0 A

A 15 kVA transformer provides adequate load capacity for small sub-panels, lighting circuits, HVAC controls, machine tool feeders, and commercial branch distribution. For larger load requirements, see our 30 kVA, 25 kVA, or 45 kVA transformer categories.

15 kVA Step-Down, Step-Up, and Specialty Dry Type Transformers

15 kVA Step Up Transformers

A 15 kVA step up transformer raises a lower incoming voltage to a higher output voltage. The most common application is feeding 480V-rated equipment from a 208V or 240V service, a frequent requirement when installing imported machinery, upgrading control panels, or reverse-feeding distribution in facility renovations. All step-up units in our inventory are three phase dry type, available from GE, Acme Electric, Federal Pacific, EGS/SolaHD, Jefferson Electric, and Hammond Power Solutions.

15 kVA Step-Up Configurations Available:

Primary Voltage	Secondary Voltage	Phase	Example Unit
208V	480V	Three Phase	GE 9T83B3031
208V	480Y/277V	Three Phase	Acme Electric T3793671S
208V	480Y/277V	Three Phase	Federal Pacific T204H15E
208V	480Y/277V	Three Phase	EGS/SolaHD ET84H15
208V	277V / 480Y	Three Phase	Hammond Power Solutions
240V	480Y/277V	Three Phase	Acme Electric T3796931S
240V	480Y/277V	Three Phase	EGS/SolaHD ET85H15S
240V	277V / 480Y	Three Phase	Hammond Power Solutions

15 kVA Step Down Transformers

A 15 kVA step down transformer reduces a higher primary voltage to a lower, usable secondary voltage. This is the most common transformer type in commercial and industrial electrical work, stepping 480V three-phase building distribution down to 208Y/120V for panels, outlets, and equipment, or 480V single phase down to 120/240V for lighting and branch circuits. We also carry 600V primary configurations for Canadian facilities and industrial plants running 600V distribution.

15 kVA Step-Down Configurations Available:

Primary Voltage	Secondary Voltage	Phase	Example Unit
480V	208Y/120V	Three Phase	GE 9T10C1001
480V	208Y/120V	Three Phase	Acme Electric TPC3533113S
480V	208Y/120V	Three Phase	EGS/SolaHD 3H13T2H15S
480V	240D/120CT	Three Phase	Jefferson Electric 423-9167-000
480V	240Y/139V	Three Phase	GE (multiple)
480V	380Y/219V	Three Phase	GE (multiple)
480V	416Y/240V	Three Phase	MGM
480V	120/240V	Single Phase	Federal Pacific S2T15E
480V	240/120V	Single Phase	Acme Electric PT061150015LS
277/480V	208/277V	Single Phase	Acme Electric GP1215000S
240 × 480V	120/240V	Single Phase	Acme Electric T2535173S
277V	120/240V	Single Phase	Acme Electric T2536771S
600V	208Y/120V	Three Phase	Acme Electric T3793331S
600V	208Y/120V	Three Phase	Hammond Power Solutions P015PBKF
600V	240/120V	Three Phase	GE 9T83B3614
600V	416Y/240V	Three Phase	MGM
600V	380Y/219V	Three Phase	MGM
600V	120/240V	Single Phase	Acme Electric T2536171S

15 kVA Specialty Dry Type Transformers

All 15 kVA transformers we stock are dry type units that use air cooling instead of oil, making them ideal for indoor commercial, healthcare, educational, and data center applications. Available options include general purpose, encapsulated, K-factor rated (K4, K13, K20), buck-boost, and isolation transformers for applications ranging from harmonic mitigation and voltage correction to noise reduction and electrical isolation. Contact our team for assistance with specific enclosure, temperature rise, or configuration requirements.

Enclosure Selection: NEMA 1 or NEMA 2 for clean, dry indoor locations. NEMA 3R for outdoor or damp environments. NEMA 3R Stainless Steel for wash-down, food processing, or coastal chemical exposure. For more information, read the blog: NEMA Enclosure Ratings Explained: Guide to NEMA Types, Chart & Applications.

Applications: Where Is a 15 kVA Transformer Used?

1. Commercial office and retail buildings: Commercial office and retail buildings commonly use 15 kVA transformers for branch panels, lighting circuits, and tenant power distribution.

2. Lighting distribution. 15 kVA units can support commercial lighting loads, control circuits, and voltage conversion for facility lighting systems.

3. Light manufacturing and assembly. These transformers are used for machine tool feeders, small production equipment, control panels, and localized power distribution.

4. Data centers and server rooms: Data centers and server rooms use dry type transformers for reliable power distribution in IT, UPS, and support infrastructure.

5. Healthcare and institutional facilities: Healthcare and institutional facilities use 15 kVA transformers for dependable electrical distribution in critical and facility-support applications.

6. International and export OEM. Multi-voltage and export configurations help match North American equipment to international electrical systems.

7. Outdoor and industrial installations. NEMA 3R and encapsulated units are suitable where damp-location or outdoor protection is required.

8. Renovation and replacement. 15 kVA transformers are commonly used for replacing failed units, upgrading panels, and supporting tenant improvement projects.

Installation Considerations for 15 kVA Transformers

Before installation, verify the transformer nameplate, voltage, phase, enclosure rating, load requirements, and applicable NEC requirements. Installation should be completed by a qualified electrical professional.

1. Ventilation. Maintain manufacturer-required airflow clearance to prevent heat buildup.

2. Overcurrent protection. Size primary and secondary protection based on NEC Article 450, nameplate data, voltage, and conductor sizing.

3. Conductor sizing. Select conductors based on full-load amps, insulation rating, terminal temperature limits, and installation conditions.

4. Grounding and bonding. Confirm grounding requirements, especially for separately derived secondary systems.

5. Enclosure rating. Use NEMA 1 or NEMA 2 for suitable indoor locations; use NEMA 3R or encapsulated options where outdoor or damp-location protection is required.

6. Taps. Verify available tap settings before energizing the transformer.

7. Mounting and access. Allow space for wiring, inspection, ventilation, maintenance, and future replacement.

8. Weight and handling. Confirm dimensions, shipping weight, and lifting requirements before delivery.

Why Electrical Professionals Choose Bruce Electric for 15 kVA Transformers

Bruce Electric Equipment Corp. has been a trusted source for dry type transformers and electrical distribution equipment since 1973. Contractors, facility managers, MRO buyers, and OEMs across the United States rely on us because we carry the inventory depth, product knowledge, and service infrastructure that generic electrical distributors don’t. When you need the right 15 kVA transformer correct voltage, phase, enclosure, and winding without chasing multiple suppliers, Bruce Electric is where professionals come first.

1. New, surplus & reconditioned. Every refurbished unit is inspected, tested, and covered by our BEE warranty (up to 2 years).

2. Fast shipping. Most units ship same-day or next-day, nationwide.

3. Spec support. Our team matches voltages, enclosures, and replacement units on request.

4. Hard-to-find units. Not listed online? Contact us. We source non-catalogue and discontinued configurations regularly.

FAQs

Q1. What is a 15 kVA transformer load capacity?

A 15 kVA transformer has a 15,000 VA apparent power rating. Real usable kW depends on power factor. At 0.9 power factor, 15 kVA equals approximately 13.5 kW.

Q2. How many amps is a 15 kVA transformer at 480V?

A 15 kVA transformer at 480V single-phase supplies approximately 31.25 amps. At 480V three-phase, it supplies approximately 18.04 amps.

Q3. Can a 15 kVA transformer be used outdoors?

Yes, if the transformer has a suitable outdoor-rated enclosure, such as NEMA 3R or another appropriate enclosure rating for the installation environment. Always confirm the enclosure rating before outdoor installation.