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25KVA Single Phase Pad Mounted Transformer

The 25 kVA Single Phase Pad Mounted Transformer is engineered to deliver reliable, cost-effective power for residential, utility, and light-commercial applications. Designed and built to exceed ANSI/IEEE, CSA, NEMA, and DOE 2016 efficiency standards, this transformer ensures minimal losses (98.63 % efficiency) while operating continuously under ONAN (oil-natural, air-natural) cooling. Its sealed, sea-foam green enclosure protects internal components from weather, dust, and tampering. Primary voltages are selectable across 2.4 kV to 34.5 kV ranges (e.g., 24 940Y/14 400 V, 12 470Y/7 200 V), with a five-position off-circuit tap changer enabling ±2×2.5 % adjustment for fine voltage regulation. Secondary outputs include 120/240 V, 240/480 V, and 347/600 V options, making it ideal for neighborhood overhead networks, single-family homes, and small commercial districts seeking safe, quiet, and efficient power distribution.

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Product Accessories

Bolt-On Bayonet & ELSP Fuse Holders
Dual-fuse protection compartments under the hinged front cover for easy access and replacement.

Pressure Relief Valve
Automatically vents excess pressure to safeguard the tank from over-pressure stress.

Magnetic Oil Level Gauge
External sight glass with low-oil alarm contacts for real-time oil monitoring.

Drip Tray & Drain Valve
Integrated bottom drain and captive sampling valve simplify fluid sampling without spillage.

Grounding Brackets & Straps
Copper bonding hardware with spade terminals ensures reliable earthing.

Tap Changer Handle & Off-Circuit Switch
External adapter for five-position ±2×2.5 % off-circuit voltage adjustments.

HV & LV Porcelain Bushings
HV bushings (two wells with inserts and dust caps) and seven-hole LV bushings are pre-mounted for plug-in cables.

Nameplate & Wiring Diagram
Stainless steel plate displaying all electrical ratings, serial data, and CSA/UL compliance, plus a laminated schematic inside the hinged door.

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Product Specifications

Rated Power

25 kVA

Primary Voltage Options

2 4 940Y/14 400 V; 12 470Y/7 200 V; 13 200/7 620 V; others

Secondary Voltage Options

120/240 V; 240/480 V; 347/600 V

Tap Range

±2×2.5 % (off-circuit, five positions)

Connection Type

Δ (Delta) / Y (Wye)

Frequency

60 Hz

BIL Rating (HV/LV)

125 kV / 35 kV

Cooling Method

ONAN (Oil Natural Air Natural)

Insulation Fluid Volume

295 L Mineral Oil

Impedance

1.50 %

Product Applications

Economy is more affordable

Serves single-family homes and small subdivisions, transforming medium-voltage lines to safe 120/240 V service.

Residential Overhead Distribution
Integrates into loop or radial feed circuits to deliver reliable power to neighborhood loads and light commercial nodes.

Utility Feeder Systems
Steps down utility voltage for strip malls, office parks, and community centers requiring 347/600 V or 240/480 V three-phase services.

Small Commercial & Retail Complexes
Ideal for remote locations where durable pad-mounted equipment minimizes maintenance trips and weather-related service interruptions.

Rural & Remote Outposts

Product Advantages

Superior Energy Efficiency

Achieves 98.63 % or higher efficiency per DOE 2016 criteria, reducing no-load and load losses to lower monthly operating costs.

Flexible Voltage Adaptability

Wide selection of primary taps (up to ±2×2.5 %) and multiple secondary options meet diverse utility and generator standards without extensive customization.

Robust, Low-Maintenance Design

ONAN cooling, sealed stainless-steel tank, and high BIL ratings provide decades of reliable service with minimal routine servicing.

WellDone Power Transformer Plan Drawing

FAQ

What range of transformer products do you offer and which standards do they meet?

We manufacture a diverse array of transformers including Oil-Immersed Distribution Transformers, Dry Type Transformers, Power Transformers, Three Phase Pad Mounted Transformers, Single Phase Pad Mounted Transformers, Substation Transformers, and Pole Mounted Transformers. Our technical team, with nearly 20 years of industry experience, ensures that our designs comply with international standards such as ANSI, IEEE, DOE, CSA, AS, AZS, GOST, IEC, and more. Additionally, many of our products have obtained UL, cUL, and CSA certifications, affirming their safety and performance in global markets.
How do you ensure the quality and reliability of your transformers?

Our transformers are produced under a rigorous quality management system covering every stage from material selection to final testing. Each product comes with a minimum 24-month warranty, ensuring long-term safety and reliability. This commitment to quality has earned the trust of global customers and leading industry players.
What are your production lead times, customization options, and global market reach?

For standard models, our production lead time is typically 10 to 25 days, and we offer flexible OEM/ODM services for customized projects. We also tailor packaging solutions to meet specific customer requirements. Our transformers are exported worldwide—including North America, Europe, South America, Australia, Asia, and Africa—with successful partnerships involving renowned companies. For more details or personalized support, please contact us via email or WhatsApp.

Single Phase Pad Mounted Transformer 25KVA Pad Mounted Transformer 25KVA Single Phase Pad Mounted Transformer

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