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Littelfuse SE-330AU-28-01 NGR Monitor, 48VDC, Dual SC Fiber, IEC 61850
$5,171$6,205 (-17%)
Littelfuse SE-330AU-28-01 NGR monitor — protection relay for neutral grounding resistors with 28–52 VAC / 36–72 VDC supply and 4–20 mA output. Genuine Littelfuse unit from Batam, fast delivery across Indonesia & Southeast Asia.
The Littelfuse SE-330AU-28-01 is a neutral grounding resistor (NGR) monitor and earth-fault protection relay designed for low- and medium-voltage transformers and generators. Rated for 28–52 VAC or 36–72 VDC supplies, with 4–20 mA analog output and adjustable trip/time settings, this protection relay provides continuous neutral current, neutral-to-earth voltage and resistance monitoring. Ideal for NGR monitoring, earth-fault protection and IEC 61850-enabled substation applications where reliable neutral supervision is required.
Key Features
- Continuous monitoring of neutral current, neutral-to-earth voltage and neutral-to-earth resistance for NGR integrity.
- Adjustable ground-fault (GF) trip levels and time delays to suit system protection coordination.
- Conformally coated electronics for enhanced durability in industrial environments.
- Communication options include IEC 61850 and USB for integration and diagnostics.
- Fail-safe operation with reset via front-panel switch or remote normally-open contact; provides a standard 4–20 mA analog output.
Technical Specifications
| Manufacturer | Littelfuse |
|---|---|
| Commercial Reference | SE-330AU-28-01 |
| Component | Neutral Grounding Resistor Monitor / Earth-fault Protection Relay |
| Supply Voltage | 28–52 VAC; 36–72 VDC |
| Analog Output | 4–20 mA |
| GF (Ground-Fault) Trip Range | 0.125–30.0 A |
| RF (Residual-Voltage) Trip Range | 20–2000 V (systems up to 5 kV); 100–10000 V (systems over 5 kV) |
| Communications | IEC 61850, USB |
| Coating | Conformal coating for harsh environments |
| Reset | Front-panel switch or remote N.O. contact |
Applications
Used for neutral-grounding resistor supervision on transformers and generators, earth-fault protection in distribution substations, NGR integrity checks on industrial power systems, and IEC 61850-integrated protection schemes.
We supply genuine Littelfuse SE-330AU-28-01 units through authorized channels from our Batam base, with fast delivery across Indonesia and Southeast Asia. For competitive pricing and stock confirmation, contact us to request a quotation and technical assistance.
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