Transformers convert industrial power into consumable power and hence they require distribution of the lines in order to function. These provide safety to the transformer and divide a single connection into multiple connections. We are manufactures of LT distribution boxes ranging from 10 KVA ratings made of fabricated mild steel, deep drawn mild steel and sheet moulding compound upto 500 KVA.

The invention of a practical efficient transformer made AC power distribution feasible;

Since distribution transformers are energized for 24 hours a day (even when they don't carry any load), reducing iron losses has an important role in their design. As they usually don't operate at full load, they are designed to have maximum efficiency at lower loads. To have a better efficiency, voltage regulation in these transformers should be kept to a minimum. Hence RMC designs them to have small leakage reactance.


Distribution transformers are classified into different categories based on factors such as:

  • Mounting location – pole, pad, underground vault

  • Type of insulation – liquid-immersed or dry-type

  • Number of phases – single-phase or three-phase

  • Voltage class

  • Basic impulse insulation level (BIL).

Use of Distribution Transformers

Distribution transformers are normally located at a service drop, where wires run from a utility pole or underground power lines to a customer's premises. They are often used for the power supply of facilities outside settlements, such as isolated houses, farmyards or pumping stations at voltages below 30 kV. Another application is the power supply of the overhead wire of railways electrified with AC. In this case single phase distribution transformers are used.

The number of customers fed by a single distribution transformer varies depending on the number of customers in an area. Several homes may be fed from a single transformer in urban areas. Rural distribution may require one transformer per customer, depending on mains voltage. A large commercial or industrial complex will have multiple distribution transformers. In urban areas and neighborhoods where the primary distribution lines run underground, pad mount transformers, transformers in locked metal enclosures mounted on a concrete pad, are used. Many large buildings have electric service provided at primary distribution voltage. These buildings have customer-owned transformers in the basement for step-down purposes.

Distribution transformers are also found in the power collector networks of wind farms, where they step up power from each wind turbine to connect to a substation that may be several miles (kilometers) distant.

Technical specifications