Littelfuse, Inc. SE-325 Series – Neutral-Grounding-Resistor Monitor SE-325DST

The SE-325 series is a neutral-grounding-resistor monitor designed for resistance-grounded systems up to 25 kV to detect ground faults and NGR integrity failures. It provides a Form A output contact with selectable fail-safe or non-fail-safe operating modes, adjustable ground-fault trip current from 0.5 to 4.0 A, and adjustable trip delay from 0.1 to 2.0 seconds. The unit operates on 120 V ac or dc input power, features a conformally coated circuit board, and includes a standard reset button. It measures 150 mm high, 109 mm wide, and 100 mm deep. The device is CSA certified, UL Listed (E340889), and meets C-Tick standards.