Large Pressure Relief Devices Large PRDs are used on medium to large power transformers, either nitrogen blanket or conservator style, load tap changers and other electrical apparatus.

Options:
Operating pressure Alarm switches
Visual indicating flag
Electrical connection types Cable size, lengths, and wire colors
Mechanically-retained top gasket, recommended for use at higher pressures and for under-oil use at higher temperatures
Stainless steel components for use in corrosive environments
Directional Shield to control the flow of hot oil/air discharge and protect the environment

Small Pressure Relief Devices Small PRDs are used on small distribution transformers, including pad, pole, and hermetic styles.

Options:
Operating pressure
Relief flow rate
Visual indicator
Mounting threads
Sealing systems