The Precision Lighting surge protectors are designed to be used in conjunction with electronic fluorescent and HID ballasts to provide an additional level of surge and transient protection in industrial and commercial applications. This surge protector is for use with 277 volt or universal voltage ballasts and LED drivers. It has a clamping voltage of 320 volts. It protects Line-Ground, Line-Neutral, and Neutral-Ground in accordance with IEEE / ANSI C62.41.2 guidelines. It features 12 inch leads.