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

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, adjustable trip delays from 0.1 to 2.0 s, and selectable fail-safe or non-fail-safe operating modes. The device is conformally coated, includes a standard reset button, and is CSA certified, UL Listed (E340889), and C-Tick compliant. It has dimensions of 150 mm high, 109 mm wide, and 100 mm deep. The SE-325ET variant operates on 240 Vac control power.