Littelfuse SE-330HV-26-01 NGR Monitor, 48VDC, Dual RJ45, IEC 61850, NC

The Littelfuse SE-330HV-26-01 is a Neutral Grounding Resistor (NGR) monitor designed for resistance-grounded AC systems. This protection relay accepts a wide DC supply range (nominal 48 VDC) and continuously monitors the NGR for shorted resistors and ground faults. Ideal for substation and distribution network protection, the SE-330HV delivers precise pickup and timing adjustments for coordinated fault detection in industrial and utility motor control and transformer neutral applications.

Key Features

• Continuous NGR monitoring with detection of shorted resistor conditions and neutral ground faults.
• Wide DC supply support (typical 48 VDC) and dual RJ45 ports with IEC 61850 communications for modern protection systems.
• Adjustable pickup (2–100% in 1% steps) and adjustable trip delay (0.1–10 s) for coordination and sensitivity tuning.
• Analog 4–20 mA output plus programmable relay contacts and pulsing output option (SE-330 models) for integration with SCADA/RTU.
• Universal CT compatibility and selectable operating modes (fail-safe/non-fail-safe) with front-panel or remote reset options.
• Conformal coating for reliable operation in harsh substation and industrial environments.

Technical Specifications

Applications

Use the SE-330HV for neutral-ground monitoring in substations and distribution feeders, transformer and generator neutral protection, industrial plant power distribution, and any resistance-grounded system requiring fast, coordinated ground-fault detection.

We supply genuine Littelfuse protection relays through authorized channels from our Batam base, with fast delivery across Indonesia and Southeast Asia. Contact us for stock confirmation and request a quotation — competitive lead times and local support available.