Littelfuse, Inc. Relays, Contactors & Transformers - Protection Relays - Resistance Grounding - Series: SE-330HV - SE-330HV-03-00 SE-330HV-03-00

The SE-330HV is a high-voltage neutral-grounding-resistor monitor designed for systems up to 72 kV, providing continuous monitoring of neutral-to-ground resistance and detecting open or shorted grounding resistors. It combines neutral current, voltage, and resistance measurements to verify integrity of the neutral-grounding path, with ground-fault detection down to 100 mA using DFT filtering to reject harmonic noise. The device features two programmable Form C and one programmable Form A output contacts, analog 4-20 mA output, onboard event logging, and conformal coating for environmental protection. It supports communication via USB (standard), DeviceNet, and IEC 61850 over dual RJ45, SC fiber and RJ45, or dual SC fiber interfaces. Mounting is panel or surface, and it complies with CSA, UL (E340889), CE, and RCM standards. Its dimensions are 213 mm H x 98 mm W x 132 mm D.