Littelfuse, Inc. PGR-3100 Series – Ground-Fault Relay PGR-3100

The PGR-3100 is a panel-mounted ground-fault indication system for ungrounded AC systems, designed to detect and indicate phase-to-ground faults using redundant LEDs. It operates on system voltages up to 600 V ac at 50/60 Hz and requires no external potential transformers below this voltage. The device measures 88.9 mm high, 108 mm wide, and 54 mm deep, and includes a lamp test button to verify LED operation. It is CSA certified, UL listed, and features conformal coating. The unit meets NEC Article 250.21(B) and Canadian Electrical Code Section 10-106(2) requirements and carries a 5-year warranty.