We do not supply these. This page is here because the question comes up and the answer is hard to find written plainly. What we do supply is three phase and single phase pad mounted distribution transformers from 25 to 2500 kVA.
The difference is the distribution system, not the transformer
A pole mounted transformer serves an overhead distribution system. A pad mounted one serves an underground system. The electrical job is identical, taking primary distribution voltage down to the customer voltage. What changes is the enclosure, the mounting and how the connections are made. Pole mounts are cylindrical, hung from brackets, with exposed bushings and an external arrester. Pad mounts are locked steel cabinets at ground level with dead front connections.
Typical sizes
Single phase pole mounts run roughly 10 to 167 kVA, with 25 and 50 kVA being the most common residential sizes. Three phase is usually achieved by banking three single phase units on a pole rather than hanging one three phase unit, because three smaller units are easier to handle at height.
Why a utility picks one over the other
Cost and geography. Overhead is dramatically cheaper to build and faster to repair, which is why rural and older suburban distribution is overhead. Underground is required by most new subdivisions and commercial developments for appearance and storm resilience, and that means pad mounted. The decision is made by the distribution design, not by the transformer.
Safety and access
A pole mount puts energised parts out of reach by height, which is why its bushings can be exposed. A pad mount sits where anyone can walk up to it, which is why dead front construction and a locked cabinet are standard. That single difference drives most of the cost and specification gap between them.
Common questions
What is the difference between a pole mounted and a pad mounted transformer
A pole mounted transformer serves an overhead distribution system and hangs on a pole with exposed bushings. A pad mounted transformer serves an underground system and sits in a locked steel cabinet at ground level with dead front connections. The electrical function is the same.
What sizes do pole mounted transformers come in
Single phase units typically run from 10 to 167 kVA, with 25 and 50 kVA being the most common residential sizes. Three phase is usually made by banking three single phase units rather than hanging one three phase unit.
Why do some areas have pole mounted and others pad mounted transformers
It follows the distribution system. Overhead distribution is far cheaper to build and quicker to repair, so rural and older suburban areas use it. New subdivisions and commercial developments normally require underground service, which means pad mounted.
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