Pad Mounted Transformers
Up to 300 MVA / 345 kV | IEEE C57 Series | ANSI / DOE / NERC / FERC Compliant
Up to 300 MVA / 345 kV | IEEE C57 Series | ANSI / DOE / NERC / FERC Compliant
Marsons manufactures liquid-filled power transformers for the US grid — pad-mounted distribution, substation power, generator step-up (GSU), and specialty transformers — engineered to IEEE/ANSI standards with PE-stamped documentation for all 50 states. Our US portfolio covers voltages from 15 kV through 345 kV and ratings from 10 kVA to 300 MVA.
| Parameter | Value / Description |
|---|---|
| kVA Range | 10 kVA to 10,000 kVA |
| Voltage Classes | 15 kV Class | 25 kV Class | 35 kV Class |
| Primary Voltages | 4,160 V – 34,500 V |
| Secondary Voltages | 208Y/120 V | 480Y/277 V |
| BIL (Primary) | 95 kV (15 kV class) | 125 kV (25 kV) | 200 kV (35 kV) |
| Single-Phase Range | 10–167 kVA per IEEE C57.12.25 |
| Three-Phase Loop-Feed | 75–2,500 kVA per IEEE C57.12.34 |
| Three-Phase Radial | 75–10,000 kVA per IEEE C57.12.00 |
| Key US Features | Dead-front loop, 2 or 4 cable positions | 200A or 600A loadbreak elbow (LBOR/NCOR) | CSP design | FR3 biodegradable fluid | NEMA 3R tamper-resistant enclosure | Grounding per NESC | Seismic per IEEE 693 on request |
| Efficiency | DOE 2016 (10 CFR 431) compliant |
| Standard | IEEE C57.12.34 (3-phase) | IEEE C57.12.25 (1-phase) |
From standard distribution to specialized power transformers, explore our robust, precision-engineered solutions designed to meet your exact energy infrastructure requirements.
A quality policy is a reflection of the endeavors and aims of the organization. Quality has always been a benchmark at Marsons.
Our uncompromising stance on quality and strict adherence to ISO 9001:2008 standards furnish our customers with the very best and reliable products.
To maintain these rigorous standards, our quality control activities are seamlessly integrated into every stage of the production cycle.
These core activities can be summarized as: custom order management, a strict approval system for all vendors, uncompromising manufacturing supervision, and comprehensive testing and inspection.
Our testing departments, utilizing high-end equipment, play a decisive role in the implementation of our quality program. We operate two laboratories, both equipped with modern machinery and precision instruments.
To ensure the highest accuracy, tests are conducted separately. One laboratory is strictly allotted for high/medium voltage transformers, and the other for medium/low voltage transformers.
Our quality is backed by accredited infrastructure. Our fully equipped NABL accredited laboratory can efficiently carry out all required routine and type tests, including Impulse lightning tests and Temperature rise tests.
This facility allows us to rigorously test various ratings of Power Transformers up to the range of 200 MVA 220 kV class using various conventional, state-of-the-art, and modern equipment.
Ready to power your infrastructure? Contact our experts today to discuss our wide range of ISO-certified distribution and power transformers, backed by 65 years of industry trust and credibility.
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