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333KVA Single Phase Pole Mounted Transformer

A rugged, field-proven 333 kVA single-phase pole transformer engineered for high-demand overhead distribution where footprint, serviceability and thermal headroom matter. Available in common pole classes (12.47 kV and 24.94 kV primary options) and low-voltage outputs for North American loads (277 V / 480 Y /120–240 V), this unit combines a compact square tank with corrugated fins, selectable insulating fluid (mineral oil or natural-ester/vegetable oil), and a factory-fitted off-circuit tap bank to handle seasonal and feeder voltage swing without complex rewiring. Designed and manufactured to modern IEEE/ANSI and regional efficiency requirements, it gives line crews an easy-to-service package for residential feeder taps, commercial spurs and rural utilities.

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Product Accessories

Standard (supplied):

HV porcelain or oil-filled bushings (2) with dust caps

LV stud/terminal pad (4- or 7-hole) for secure service connections

Off-circuit HV tap changer (5-position) with clear markings

Pressure-relief device with alarm/trip contacts and vacuum pressure gauge

Oil fill, drain & sample valves (captive caps)

Stainless steel nameplate and door-mounted wiring diagram

Pole mounting brackets, lift/support lugs and hold-down pads

Common options (factory fit or field kit):

Natural-ester (FR3®) or vegetable oil fill for higher fire safety and improved insulation ageing.

HV surge arrester mounting kit and pre-wired arrester leads

LV fused switch or bayonet fuse assembly for selective protection

IR inspection window for thermographic surveys without opening compartments

Fan-assist kit (ONAF/KNAN) for temporary overload/extended duty

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Product Specifications

Rated Power

333 kVA (continuous)

Nominal Primary Voltages

12.47 kV or 24.94 kV (other pole classes available to order)

Nominal Secondary Voltages

277 V (single-phase) / 480Y/277 V / 120/240 V configurations available

Tap Range

Off-circuit, 5-position (typical setting ±2 × 2.5% for 24.94 kV class) — site-selectable.

Cooling

ONAN (mineral oil) standard; KNAN (vegetable oil) or fan-assist options for extended duty.

Insulation & BIL

Typical HV BIL options up to 150 kV for higher surge environments; LV BIL up to 45 kV depending on configuration.

Impedance

Variant dependent — ~2.5% (24.94 kV optimized design) and ~4.0% for select 12.47 kV configurations (factory test data supplied).

Winding Material

Aluminum standard (upgradeable to copper on request).

Frequency / Duty

60 Hz; continuous rated per IEEE C57 family limits.

Standards & Efficiency

Designed and tested to IEEE/ANSI distribution transformer standards; meets contemporary DOE/CSA efficiency expectations for single-phase pole-mount units.

Product Applications

Economy is more affordable

pole-top step-down to serve groups of single-family homes and street lighting where compact pole-mounted equipment is required.

Suburban feeder tap for multi-home clusters
supplies 277/480 V distribution for lighting, HVAC and small motors at shopping strips, with optional LV fused switch for selective protection.

Commercial frontage / retail strip feed
provides robust single-phase power for motors and control gear in remote farm installations; natural-ester fluid reduces fire risk near wooden structures.

Agricultural pump station / irrigation node
lightweight pole-mount step-down for remote communications sites and standby generator tie-ins where fast access and straightforward maintenance are priorities.

Backup generator/telecom shelter interface

Product Advantages

Higher thermal margin with selectable fluids

the option to use natural-ester (FR3®) or vegetable oil (KNAN designation) increases flash/fire points and can permit higher allowable temperature rise, extending insulation life and offering improved site safety in congested or wooden-pole environments.

Field-centric serviceability

off-circuit tap bank, accessible valves and clearly labeled terminals reduce on-pole work time and lower truck-roll costs for utilities and contractors.

Standards-compliant, efficiency-aware design

built to IEEE/ANSI distribution norms and tuned to meet modern DOE/CSA efficiency expectations so owners get lower losses and predictable lifecycle operating cost.

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.