What Is a Pad-Mounted Transformer

1. What Is a Pad-Mounted Transformer?

An American pad-mounted transformer, often referred to as a pad-mount substation, is a compact power distribution unit that integrates a transformer, high-voltage load switch, fuses, and low-voltage distribution system all in one sealed metal enclosure.

Unlike traditional transformers that require dedicated rooms or structures, this transformer is designed for direct ground installation, making it ideal for urban neighborhoods, industrial parks, and underground cable systems. 

2. Key Features

Sealed Metal Enclosure: Designed to withstand outdoor environments with protection against water, dust, and corrosion.

Oil-Immersed Core: Uses oil for cooling and insulation, offering stable performance and long service life.

Front-Access Maintenance: All operations and maintenance are performed from the front—no need for rear access.

Cable Entry Design: Both high and low voltage are cable-connected, improving safety and layout flexibility.

Enhanced Protection: Equipped with load switches and fuses for dual-layer protection.