These devices provide a real-time, line-of-sight LED signal when the NFPA 99 75% limit has been reached (this is an indication only - no power will be shut off to the outlets). Inform monitors the load of devices so you dont have to, removing the need for manual calculations. The load monitoring LED will stay OFF until the 75% limit is reached. Offered in 4 and 6 outlet configurations, with surge protection and non-surge options, and 7 cord and 15 cord configurations. Usable in Isolated Power Applications