The Intermatic IG1240RC3 AC Surge Protector features six modes of protection and is recommended for residential and light commercial applications. It is intended for installation on 120/240 volt AC panels. The IG1240RC3 incorporates the newest developments in MOV technology and provides individual component thermal protection and monitoring. The failure of a single component will turn the LED indicator OFF and turn the alarm indicator ON. The IG Series Surge Protective Devices are designed for a variety of Type 1 and Type 2 applications. Type 1 applications include outdoor installations before service entrances and utility meter cabinets. Type 2 applications include installations after service entrances.