Littelfuse, Inc. SE-330 Series – Neutral-Grounding-Resistor Monitor SE-330-06-01

The SE-330 is a neutral-grounding-resistor monitoring relay that continuously verifies the integrity of the neutral-grounding resistor by measuring neutral current, neutral-to-ground voltage, and resistance. It detects open or shorted resistors and ground faults as low as 100 mA using Discrete Fourier Transform filtering to prevent false trips from harmonic noise. It features two programmable Form C and one programmable Form A output contacts, an analog 4-20 mA output, a pulsing output for ground-fault location, and onboard event logging. The unit has a panel or surface mounting style with dimensions of 213 mm H × 98 mm W × 132 mm D. It supports USB communication and IEC 61850 via dual RJ45 interface, is conformally coated, and operates with a 120/240 Vac/Vdc power supply. It is CSA certified, UL Listed, CE marked, and RCM compliant.