This hardwired Intermatic IG3240-RC3 Panel Surge Protector provides greater capacity to handle surge energy (based on its close location to the service ground) compared to standard plug-in strips and is designed for 120/240 volt single or (split-phase) panels. It features dual LED indicators which provide surge protection status on AC and (4) 30 inch 12-gauge leads. Offers 6 Mode protection for the sensitive electronic circuits in your computer, components and electronic appliances. When a surge occurs, the unit responds within 5 nanoseconds, diverting the destructive energy to ground while protecting equipment. Easy to install on main circuit breaker panel.