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

The SE-325E is a neutral-grounding-resistor monitor designed for resistance-grounded systems up to 25 kV, with a control power input of 240 Vac. It monitors neutral-to-ground current and voltage to detect NGR failure, loose connections, or ground faults, with adjustable ground-fault trip levels from 0.5 to 4.0 A and trip delays from 0.1 to 2.0 seconds. It features a Form A output contact, selectable fail-safe or non-fail-safe operating mode, and a standard reset button. The unit is conformally coated, CSA certified, UL Listed (E340889), and C-Tick compliant, with dimensions of 150 mm H × 109 mm W × 100 mm D.