The PGR-3100 indicates the presence of voltage on each phase of a three-phase system. The LEDs in the panel light up when voltage is present. When a ground-fault occurs, the voltage on the faulted phase reduces to ground potential, causing the LEDs for the faulted phase to dim and the LEDs for the unfaulted phases to become brighter.

Features/Benefits
• Meets National Electrical Code (NEC®) Article 250.21(B)
requirements for ungrounded systems
• Indicates presence of a ground-fault and the faulted phase
• Lamp Test push button to verify proper operation
• Redundant long-life LEDs (two per phase) for reliability