Littelfuse SE-330-27-00 NGR Monitor, 48VDC, SC Fiber/RJ45, IEC 61850, NO

The Littelfuse SE-330-27-00 is a Neutral Grounding Resistor (NGR) Monitor and protection relay designed for resistance-grounded AC systems. Supporting a wide DC supply range that includes 48 VDC nominal, it provides continuous detection of resistor faults, shorted NGRs and neutral ground faults. Adjustable ground-fault pickup (2–100% of CT primary) and trip delay (0.1–10 s) make it suitable for switchgear, substations and industrial distribution protection schemes.

Key Features

• Continuous NGR monitoring with shorted-resistor and ground-fault detection.
• Adjustable pickup 2–100% of CT-primary, settable in fine increments for sensitivity tuning.
• Adjustable trip delay 0.1–10 s; selectable latching or auto-reset; fail-safe or non-fail-safe modes.
• Universal CT compatibility with 4–20 mA analog output and optional pulsing output for integration into protection systems.
• Modern communications: IEC 61850 and USB support, with SC-fiber and RJ45 physical interfaces for network connectivity.
• Programmable output contacts plus front-panel switch and remote N.O. contact for reset and control.

Technical Specifications

Applications

Monitoring neutral-ground resistor integrity in utility substations, transformer neutrals, generator sets, industrial switchgear and distribution panels, and in mining or petrochemical plants. Used as primary or backup ground-fault protection in distribution and substation protection schemes.

We supply genuine Littelfuse SE-330-27-00 units through authorized distribution channels. Based in Batam, Wulan Dari offers fast delivery across Indonesia and Southeast Asia, competitive pricing and local support. Contact us to request a quotation and lead time for your NGR monitoring requirement.