300 kVA Pole-Mounted Distribution Transformer

300 kVA Pole-Mounted Distribution Transformer is prepared for overhead distribution service. It covers 11kV / 13.2kV / 22kV / 33kV input networks and 208Y/120V or 480Y/277V output distribution. It uses ONAN with High-Efficiency Radiators cooling or thermal design data where specified. This series description presents the application, construction, protection, and specification details in finished product copy.

The Limit of Cylindrical Overhead Design

For overhead distribution service, the Limit of Cylindrical Overhead Design is treated as a practical design and selection point rather than generic catalog wording.

• The 300 KVA Pole-Mounted Transformer stands as the ultimate capacity threshold for the traditional cylindrical (round-tank) overhead form factor. Delivering nearly 830 Amps at 208V, this unit is engineered exclusively for heavy commercial or light industrial service entrances where underground cabling is not an option.
• As the largest standard pole type transformer in this series, it pushes the boundaries of single-pole installation. Due to its massive oil volume and core weight, structural engineers typically mandate that this unit be installed on a two-pole "H-Frame" platform rather than a single cross-arm, ensuring safe weight distribution over the lifespan of the installation.
• 300 kVA transformer installed on a two-pole platform structure.
• For weight distribution.

Navigation Guide: PMT and High-Capacity Units

Navigation Guide: PMT and High-Capacity Units provides selection data that helps compare ratings, voltage classes, and installation requirements.

• Choosing the right transformer at this capacity level often involves navigating industry terminology and structural types.
• Looking for "PMT" (Pad-Mounted)? While "PMT" is often used as an abbreviation for Pole-Mounted Transformers, in many regions it specifically refers to Pad-Mounted Transformers (Ground-level green boxes). If your project requires a tamper-proof cabinet for ground installation (e.g., for underground distribution), please switch to the PMT transformer (Pad Mounted) series.
• Need 400 kVA or 500 kVA on a Pole? The 300 kVA unit is the limit for this cylindrical design. However, installation on poles does not stop here. For capacities like 400 kVA or 500 kVA, the physical structure shifts from a round tank to a Rectangular Industrial Tank (with radiator banks) to manage the thermal load. These larger units can still be platform-mounted on poles, but they are technically classified under the Industrial series. For these requirements, please navigate to the 3 phase pole mounted transformer (Oil Immersed Section) to view these high-capacity rectangular options.

Industrial-Grade Terminations

For overhead distribution service, industrial-Grade Terminations is treated as a practical design and selection point rather than generic catalog wording.

• Handling the high current of a 300 kVA unit requires robust connectivity.
• NEMA 6-Hole Spades: To prevent terminal overheating, the low-voltage bushings are fitted with heavy-duty copper paddles with a 6-hole NEMA pattern.
• Strain Relief: This oversized termination area allows line crews to use multiple parallel conductors (e.g., 3 x 350 MCM per phase) to carry the current, whilst providing sufficient surface area to bolt on stress-relief brackets, protecting the porcelain from cable weight.

Technical Data Sheet

Technical Data Sheet provides selection data that helps compare ratings, voltage classes, and installation requirements.

• Technical Parameter.
• Specification Data.
• 300 kVA (Max Cylindrical).
• 3-Phase Integrated (T-Tank).
• 11kV / 13.2kV / 22kV / 33kV.
• 208Y/120V or 480Y/277V.

Typical Application Context

Typical Application Context connects the product rating with the field conditions, enclosure layout, and distribution role it is normally selected for.

• 300 kVA transformer on an H-frame platform serving as a main.
• Industrial power input.
• Industrial Service Drops: acting as the sole power input for a mid-sized factory, mounted on an H-Frame platform at the property boundary.
• Overhead Network Support: Used in older city grids where dense load growth requires maxing out the overhead capacity before trenching for underground cables becomes necessary.

Electrical and Mechanical Data

The table data is organized for quick rating comparison, project specification, and transformer selection.

Product Detail Images