Leviton 55240-ASA 55000 Series LED Indicator and Audible Alarm, Single Phase, 120/240-Volt Type 1 Outdoor Surge Arrester Type 1 Surge Protective Devices are typically mounted on the line side of the main service entrance Protect against external surges cause by lightning or utility capacitor bank switching 50-kA maximum surge current per Mode Real-time diagnostic LED's monitor power and suppression status for each phase (includes audible alarm) Limited Lifetime Product Warranty