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

The SE-325 series is a neutral-grounding-resistor monitor for resistance-grounded systems up to 25 kV, designed to detect ground faults and NGR failures by monitoring current and voltage in the neutral-to-ground path. It offers adjustable ground-fault pickup from 0.5 to 4.0 A and trip delay from 0.1 to 2.0 s, with a Form A output contact and selectable fail-safe or non-fail-safe operating mode. The device is conformally coated, includes a standard reset button, and is CSA certified, UL Listed (E340889), and C-Tick compliant. It measures 150 mm high, 109 mm wide, and 100 mm deep. The SE-325ESNT variant operates on 240 Vac power, as specified in the ordering information for the SE-325E model.