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Littelfuse SE-330AU-26-01 NGR Monitor 48VDC Dual RJ45 IEC 61850 NC
$5,171$6,205 (-17%)
Littelfuse SE-330AU-26-01 Neutral Grounding Resistor (NGR) monitor — 28–52 VAC / 36–72 VDC supply, IEC 61850 Dual RJ45 and USB communications. Genuine Littelfuse protection relay, available from Batam with fast delivery across Indonesia & Southeast Asia.
The Littelfuse SE-330AU-26-01 is a neutral grounding resistor (NGR) monitor and earth-fault protection relay designed for low- and medium-voltage transformers, generators and distribution systems. With 28–52 V AC or 36–72 V DC supply options, IEC 61850 (dual RJ45) and USB communications, it continuously monitors neutral current, neutral-to-earth voltage and resistance, providing configurable ground-fault trip levels and 4–20 mA analogue output for system integration.
Key Features
- Multiple contact options: selectable 1 Form A (NO), 1 Form B (NC) or 2 Form C (changeover) relay outputs for alarm/trip.
- Wide supply compatibility: supports 28–52 V AC and 36–72 V DC control supplies for flexible installation.
- Advanced fault detection: ground-fault trip range 0.125–30.0 A with trip times from 0.1 to 0.5 seconds.
- Residual/fault voltage detection: RF trip thresholds 20–2000 V (systems ≤5 kV) or 100–10000 V (systems >5 kV).
- Communications and outputs: IEC 61850 (dual RJ45) and USB ports plus 4–20 mA analogue output for monitoring and SCADA integration.
- Reset and filtering: front-panel or remote N.O. reset, with standard harmonic filtering to reduce nuisance trips.
Technical Specifications
| Manufacturer | Littelfuse |
|---|---|
| Commercial Reference | SE-330AU-26-01 |
| Component | Neutral Grounding Resistor Monitor (NGR monitor / earth-fault relay) |
| Supply Voltage (AC) | 28–52 V AC |
| Supply Voltage (DC) | 36–72 V DC |
| Contact Configurations | 1 Form A, 1 Form B, or 2 Form C (selectable) |
| Ground-fault Trip Range | 0.125–30.0 A |
| Ground-fault Trip Time | 0.1–0.5 seconds |
| Residual/Fault (RF) Trip Voltage | 20–2000 V (systems ≤5 kV); 100–10000 V (systems >5 kV) |
| Analogue Output | 4–20 mA |
| Communications | IEC 61850 (Dual RJ45), USB |
| Reset | Front-panel switch or remote N.O. contact |
| Monitoring Functions | Neutral current, neutral-to-earth voltage, neutral-to-earth resistance; continuous verification of NER integrity |
| Revision | New revision available (old revision discontinued) |
Applications
Used for neutral earthing resistor monitoring and ground-fault protection on transformers, generator neutrals, MV distribution panels and industrial power systems in utilities, manufacturing, mining and petrochemical plants.
We supply genuine Littelfuse protection relays through authorized channels from our Batam base. Fast delivery across Indonesia and Southeast Asia, competitive commercial terms and technical support available — contact us to request a formal quotation for the SE-330AU-26-01.
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