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

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. The relay provides two programmable Form C and one programmable Form A output contacts, an analog 4-20 mA output, and supports USB communication. It is conformally coated, includes an onboard microSD card for data logging, and has a panel or surface mounting style with dimensions of 213 mm height, 98 mm width, and 132 mm depth. The unit is CSA certified, UL Listed (E340889), CE compliant, and RCM certified.