3-Phase Pad Mount Transformer
Built to IEEE/ANSI standards, our customizable transformers are used for Industrial, Solar, Utility, Data Center, and Commercial applications.
FROM 100kVA
TO 10,000kVA
UP TO 35kV
Overview
supertran three-phase pad-mounted transformers are engineered with a singular focus: helping customers buy with confidence and execute projects smoothly - from PO to commissioning.
From design through delivery, each unit is built for reliable performance and long service life in demanding environments. Our designs prioritize thermal efficiency, mechanical strength, and electrical reliability, with a minimum K-4 rating.
To strengthen long-term reliability and project confidence, supertran specifies 120°C or 140°C thermal class insulation rather than the ANSI base standard of 105°C. This higher thermal class supports cooler operation, higher ambient tolerance, and greater continuous loading - well suited for solar generation, motor-driven loads, data centers, and other demanding applications. Combined with robust design and fluid options such as FR3, these choices help extend transformer life, improve overload capability, and reduce customer risk - so power is dependable and project delivery stays on track.
Standard Design and Options
Construction
5-legged core
Wye/Wye advantages
Elliptical Windings
Smaller tank
Wound Core
Wye/Wye advantages
Copper Windings
Smaller tank
K9, K13
For increased Harmonics (See K rating info below)
3, 4, 5 Windings
Lower secondary amps, drives, special applications
Galvanized or Stainless
Better corrosion resistance
Valved removable radiators
Good for maintenance planning, may be required for shipping
Live Front HV bushings
Exposed bushing connections
ONAN/ONAF
Forced Air rated kVA Fans increase the maximum kVA
KNAN/KNAF
Forced Air rated kVA Fans increase the maximum kVA
Fluid
FR3 vegetable oil
KNAN cooling, High flash point, and more advantages.
Fusing
Bay-O-Net Fuses with Current Limiting Fuses
Over-current protection and Current Limiting Fuses for transformer internal fault protection
LB Switches
HV 4 position Load-break switch
For loop applications.
1. Feed Left / 2. Feed Right / 3. Feed Through / 4. OFF
Standard Gauge & Accessory Package
Optional Design Features & Accessories
Fan cooling
ONAN/ONAF or KNAN/KNAF for higher capacity and run cooler. Not to be used in unsecured public areas.
LV cable supports
To provide support heavy cables, standard on 12-hole spades
Sudden Pressure Rise Relay
Cover Mounted Pressure Release Device
Special HV taps
K Taps (12, 12.47, 13.2, 13.8, 14.4kV) or 7 taps (specify taps requested to be within total 20% Voltage range)
Electrostatic Shield
To mitigate voltage transients and anomalies generated to the source. Commonly used with K rating, and Drive isolation transformers.
Oil level gauge w/contacts
Wired to external control box
Oil temp gauge with contacts
Wired to external control box
Pressure/Vac gauge w/contacts
Wired to external control box
Gauges and device external
Lockable external box for gauges and sample port
External control box
External box for gauges and nitrogen port
External box for oil sample valve
K Rating Information To Consider
According to IEEE C57.110
- Computer Data Centers K Factor should be between 3.5 – 4.
- UPS Systems K Factor should be between 3.0 – 3.8.
- Fluorescent Lighting should be between 2.0 – 2.5.
According to IEC 60076-7
- Variable Frequency Drives should be between 4.0 – 5.5.
- Arc Furnaces should be between 5.0 – 6.5.
- Industrial Drives should be between 4.0 – 5.0.
K9 is commonly used for 6 pulse drives.
The values shown above are for quick reference. We are available to help determine the appropriate K Rating based on your loads and system configuration. Additional K rating results in improved efficiency in most cases.
Our Promise
Exceptional
quality
We implement strict quality control measures at every stage of production to ensure our products meet or exceed industry standards.
Custom-Built
Excellence
From FR3 to upgraded insulation options, we offer tailored builds to meet your cooling, environmental, and safety requirements.
Dedicated support
We arrange responsive service, technical expertise, and reliable warranty support, all from a U.S.-based team.
Comprehensive
warranty
We stand behind our products with a robust warranty that covers both materials and workmanship.
Competitive
pricing
We deliver exceptional value so you receive top-tier, reliable, high-quality products without the premium price tag.
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3-Phase Pad Mount Transformer
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