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

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 measuring current and voltage in the neutral-to-ground path. It features a Form A output contact, adjustable ground-fault trip levels from 0.5 to 4.0 A, and adjustable trip delays from 0.1 to 2.0 s. The device supports selectable fail-safe or non-fail-safe operating modes and includes a standard reset button. It is conformally coated and certified CSA, UL Listed (E340889), and C-Tick compliant. Dimensions are 150 mm H × 109 mm W × 100 mm D. The SE-325DN variant operates on 120 V ac/dc supply voltage.