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

The SE-325 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 seconds. The unit operates on 120 Vac and has a selectable fail-safe or non-fail-safe contact mode. It is conformally coated, includes a standard reset button, and is rated for surface mounting with dimensions of 150 mm H x 109 mm W x 100 mm D. The device is CSA certified, UL Listed (E340889), and C-Tick compliant, with a five-year warranty.