9A single phase open variac offered gas a specific input voltage, output voltage and output current. This single phase variable transformer is suitable for industrial applications, given to its rugged construction, easy installation, precision & open wound, and standard connections. It can change voltage by changing the primary and secondary coils ratio. The design of 9A single phase open variac seems complex, but is simple to the users who have used it earlier. It is available in different models for different range of current.