Surgitron® I is a modular design that has an exceptional track record of protection and reliability for over 30 years. The Surgitron® I offers primary protection against multiple lightning strikes or other voltage surges. The surge current capability exceeds the heaviest surge described by ANSI/IEEE C62.41-1991 (location category C3). With tens of thousands of satisfied customers, the Surgitron® I is the safe bet when you cannot afford to have costly damaged to electronics or down time due to surge induced repairs.