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Littelfuse SE-330AU-27-00 NGR Monitor 48VDC SC Fiber/RJ45 IEC 61850 NO
$5,171$6,205 (-17%)
Littelfuse SE-330AU-27-00 Neutral Grounding Resistor (NGR) monitor — protection relay compatible with 28–52 VAC and 36–72 VDC (commonly 48 VDC systems). Genuine Littelfuse unit with IEC 61850 support and 4–20 mA output. Fast delivery from Batam across Indonesia & SEA.
The Littelfuse SE-330AU-27-00 is a Neutral Grounding Resistor (NGR) monitor and earth-fault protection relay designed for low- and medium-voltage transformers and generator neutrals. With supply compatibility of 28–52 VAC or 36–72 VDC (commonly used with 48 VDC battery systems), IEC 61850 communications and a 4–20 mA analog output, it continuously verifies neutral-to-earth resistance and detects ground faults. Suited for protection-relay, NER supervision and earthing resistor monitoring in substations, generator sets and industrial power systems.
Key Features
- Advanced NER and earth-fault monitoring for neutral-to-earth current, voltage and resistance.
- Conformally coated electronics for improved environmental protection in demanding installations.
- 2 Form A + 2 Form C relay contacts; fail-safe operation with front-panel switch and remote N.O. contact reset.
- Communications: USB and IEC 61850; supports RJ45 / fibre connectivity options for modern substation integration.
- Analog 4–20 mA output and standard harmonic filtering to support integration with SCADA/RTU and control systems.
Technical Specifications
| Manufacturer | Littelfuse |
|---|---|
| Commercial Reference | SE-330AU-27-00 |
| Component | Neutral Grounding Resistor Monitor (NGR) |
| Supply Voltage | 28–52 VAC; 36–72 VDC (48 VDC compatible) |
| Contacts | 2 Form A (NO) and 2 Form C (changeover) |
| Environmental Protection | Conformal coating |
| Communications | USB, IEC 61850 (RJ45 / fiber options) |
| Analog Output | 4–20 mA |
| Ground-Fault (GF) Trip Range | 0.125–30.0 A |
| Residual-Fault (RF) Trip Range | 20–2000 V (systems ≤5 kV); 100–10000 V (systems >5 kV) |
| GF Trip Time | 0.1–0.5 s |
| RF Trip Time | 12 s |
| Reset Options | Front-panel switch and remote N.O. contact reset |
Applications
Neutral earthing-resistor supervision on power transformers; generator neutral monitoring on standby and prime power sets; distribution substation earth-fault protection; industrial plant and mining power-system earthing verification.
We supply genuine Littelfuse protection relays through authorized channels from our Batam base, with fast delivery across Indonesia and Southeast Asia. Competitive pricing and responsive support — contact us to request a quotation or confirm stock and lead time.
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