Amperite 50NO120 is a line overcurrent relay produced by Amperite. It is a three-phase current-sensing device, designed to provide a means of protective current-sensitive control and electrical protection. It is designed to sense overloads, shorts, and single-phase faults on a three-phase wye system. This relay is compact in design, allowing it to be mounted in tight spaces. It has a maximum current rating of 120A, a sensing range of 5A-120A, and a response time of 0.2-2 seconds. It is designed for use in commercial, industrial and residential applications, providing accurate circuit protection and control.