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

The SE-325 series is a neutral-grounding-resistor monitor designed for resistance-grounded systems up to 25 kV to detect failures in the neutral-to-ground path and ground faults. It mounts as a surface-mounted device with dimensions of 150 mm height, 109 mm width, and 100 mm depth. The monitor measures current and voltage to detect loose connections, corrosion, or resistor failure, with adjustable ground-fault trip levels from 0.5 to 4.0 A and trip delays from 0.1 to 2.0 s. It provides a Form A output contact with selectable fail-safe or non-fail-safe operating modes, is conformally coated, and features a standard reset button. The series is CSA certified, UL Listed (E340889), and meets C-Tick standards.