This surge protector protects your home's electrical panel against power surge damage. This protector keeps surges from entering through your main electrical service panel. Multiple MOV technology with thermal disconnect prevents catastrophic failure of the surgeassure™ TE/1C40. Light commercial design allows for superior protection against multiple surge events. Two LEDs indicate protection status and an audible alarm alerts you if protection is disrupted. Unique Ground Status Monitoring circuit provides notification if excessive Neutral-Ground voltage is present. 40,000 amperes Surge Current Rating For 120/240 1 Phase 50/60 Hz. voltage systems For services rated up to 400 amperes (including 100 amp, 200 amp, etc.) Underwriters Laboratory Listed - 1449 3rd Edition, Type 2 SPD; cULus (Canada) Connects to your home's electrical panel through a 20A, 2-pole circuit breaker Installed by licensed electrical contractor Product Warranty 10 years Connected Equipment Warranty 10 years (when installed by a qualified electrician) Available as Surface or Flush mount