Pole Mounted Single-Phase Transformer Overview
The Pole Mounted Single-Phase Transformer is an oil-cooled distribution unit that steps down high voltage electrical power from primary voltage levels to secondary voltage levels (220 volts) for use in homes and businesses. The metal transformer is constructed with CRGO (Grain-Oriented) Silicon Steel cores and high-purity Copper / Aluminum windings for an efficient and durable outdoor unit. The transformer features an input voltage range of 4160V to 24940V, which converts to a 120/240V or 240/480V output voltage. The average kVA range the transformer can handle is between 5 kVA and 333 kVA, with a temperature rise of 55°C to 65°C. This transformer meets the following efficiency requirements: DOE 2016 and NEMA TP1. The outdoor unit is constructed to withstand severe weather conditions and can be mounted on poles and will function continuously without maintenance.
Key Features & Benefits
High-Efficiency Core
CRGO Silicon Steel or Amorphous Metal core reduces power losses during standby, achieving up to 99.43% efficiency at higher kVA ratings.
Flexible Windings
Options available for Copper (CU) windings for superior performance or Aluminum (AL) windings for cost-effective solutions.
Conventional or CSP
Choose between Conventional models for standard networks or CSP (Completely Self-Protected) models for simplified pole-top installations with built-in breaker and arrester.
Outdoor Durability
Features a heavy-gauge steel tank with a corrosion-resistant coating, ensuring reliable performance from -25°C to +40°C.
DOE & NEMA Compliance
Exceeds DOE 2016 and NEMA TP1 efficiency requirements, ensuring energy savings and regulatory compliance.
50Hz / 60Hz Ready
Designed to support both frequency standards, making it suitable for global distribution networks.
Applications & Industries
Residential Distribution
Ideal for neighborhoods, apartment complexes, and rural housing developments requiring reliable 120/240V power supply.
Light Commercial
Efficiently supports power needs of retail stores, restaurants, clinics, and small businesses with moderate energy demands.
Infrastructure Lighting
Provides power for streetlights, parking areas, traffic signals, and general outdoor lighting applications.
Temporary & Mobile Power
Perfect for construction sites, outdoor events, and emergency response camps needing dependable single-phase power supply.
Technical Specifications
Liquid-filled, pole-mounted single-phase transformer with a 65°C temperature rise and a 150kV BIL rating for superior performance.
| kVA | Primary Voltage | Secondary Voltage | A (mm) | B (mm) | C (mm) | Weight (kg) | DOE 2016 Eff. (%) | NEMA TP1 Eff. (%) |
|---|---|---|---|---|---|---|---|---|
| 10 | 4160, 7200, 7620, 12470, 13200, 13800, 19920, 24940 | 120/240 240/480 277 346 600 |
530 | 600 | 1060 | 160 | 98.70 | 98.40 |
| 15 | 530 | 600 | 1060 | 180 | 98.82 | 98.60 | ||
| 25 | 580 | 660 | 1080 | 230 | 98.95 | 98.70 | ||
| 37.5 | 610 | 690 | 1090 | 290 | 99.05 | 98.80 | ||
| 50 | 650 | 700 | 1100 | 340 | 99.11 | 98.90 | ||
| 75 | 680 | 750 | 1250 | 450 | 99.19 | 99.00 | ||
| 100 | 730 | 800 | 1250 | 500 | 99.25 | 99.00 | ||
| 167 | 900 | 850 | 1300 | 780 | 99.33 | 99.10 | ||
| 250 | 1200 | 900 | 1450 | 1100 | 99.39 | 99.20 | ||
| 333 | 1350 | 1200 | 1500 | 1300 | 99.43 | 99.20 |
Contact us for single phase transformer PDF datasheets, wiring diagrams, and load test reports.
Why Choose Our Single-Phase Transformers
Manufacturing Expertise
Decades of experience providing oil-filled transformers to utilities and OEMs worldwide.
Certified Quality
Every unit undergoes rigorous routine tests (load, insulation, ratio) to meet IEC and IEEE standards before shipment.
Competitive Pricing
An optimized supply chain ensures that the price of single-phase transformers remains attractive for bulk purchases.
Fast Lead Times
Standard models ship in 2–4 weeks, with emergency stock available for common capacities.
Certifications & Standards
NEMA TP1
IEC 60076
CSA C227.4
ISO 9001
How This Single-Phase Transformer Fits Your Project
Guiding contractors, developers, EPCs, and electrical distributors in bulk purchases.
Project Applications
For Residential Subdivisions, 5–50 kVA models with DOE 2016 compliance guarantee long-term energy savings. In Rural Electrification, CSP transformers eliminate external protection hardware, reducing installation complexity. Commercial Chains often select aluminum windings to lower upfront costs, while copper units serve critical infrastructure like hospitals.
Copper vs Aluminum Windings
Copper offers higher overload capacity and longer life. Aluminum provides a lighter, budget-friendly alternative—both meet efficiency standards. Request our single-phase transformer equivalent circuit and construction details to ensure performance.
CSP vs Conventional
CSP models integrate a primary fuse and secondary breaker inside the tank, drastically simplifying pole-top hardware. Conventional types allow more flexible external coordination, preferred by utilities with existing standardization.
Frequently Asked Questions
What are single-phase transformers?
A single-phase transformer transfers energy in a single AC phase, typically stepping down primary distribution voltage (e.g., 7.2 kV) to 120/240V for residential use.
What is the difference between a single-phase and a three-phase transformer?
Single-phase transformers serve lighter loads like homes and small offices, while three-phase units handle heavy industrial power with three interconnected phases.
What are the disadvantages of single-phase transformers?
They have higher per‑kVA weight at large capacities and are less efficient for industrial motors, but remain ideal for residential and light commercial networks.
Is 240V single-phase or three-phase?
Standard 240V service is single-phase, supplied by a center-tapped secondary winding of a single phase transformer.
How does a single phase transformer work?
The single phase transformer working principle relies on electromagnetic induction; a varying primary current induces a proportional voltage in the secondary winding according to the turns ratio.
Can I get wiring diagrams and PDF datasheets?
Yes, we supply detailed single phase transformer diagrams, construction plans, and factory test reports—contact us with your project specifications.
