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Littelfuse SE-330AU-27-01 NGR Monitor 48VDC SC Fiber/RJ45 IEC 61850 NC
$5,171$6,205 (-17%)
Littelfuse SE-330AU-27-01 Neutral Grounding Resistor (NGR) Monitor, nominal 48 VDC supply, provides continuous NER and earth-fault supervision. Genuine Littelfuse device from authorised distribution — fast delivery across Indonesia and Southeast Asia from Batam.
The Littelfuse SE-330AU-27-01 is a neutral grounding resistor (NGR) monitor / earthing-resistor monitoring relay designed for low- and medium-voltage power systems. With a nominal 48 VDC supply and wide-range voltage options, it continuously supervises neutral current, neutral-to-earth voltage and neutral-to-earth resistance to detect open or degraded NER paths. Ideal for substations, transformer and generator protection, and industrial power-distribution applications where reliable earth-fault and NGR supervision is required.
Key Features
- Continuous monitoring of neutral current, neutral-to-earth voltage and neutral-to-earth resistance to ensure the NER remains intact.
- Multiple relay contact configurations including normally-closed options for fail-safe signalling and interlocks.
- Configurable trip levels and reset options to match site protection logic and operating procedures.
- Communication interfaces including IEC 61850 support with fiber (SC) and RJ45 connectivity for substation integration.
- Built-in harmonic filtering and signal conditioning to reduce false alarms from distorted waveforms.
- Designed for low- and medium-voltage transformers, generators and distribution networks where NGR supervision is critical.
Technical Specifications
| Manufacturer | Littelfuse |
|---|---|
| Commercial Reference | SE-330AU-27-01 |
| Component | Neutral Grounding Resistor Monitor (NGR Monitor) |
| Supply Voltage | Nominal 48 VDC (feed-listed ranges include 28–52 VDC and 36–72 VDC; model dependent) |
| Monitored Parameters | Neutral current, neutral-to-earth voltage, neutral-to-earth resistance |
| Communications | IEC 61850; fiber (SC) and RJ45 interface options |
| Outputs | Multiple relay contacts; configurable trip/reset logic (including NC options) |
| Additional | Standard harmonic filtering; configurable trip levels |
Applications
Protecting neutral-earthing resistors on transformers and generators, earth-fault detection in distribution substations, NGR supervision in industrial plants (mining, petrochemical, manufacturing), and integration into IEC 61850-enabled substation automation systems.
We supply genuine Littelfuse SE-330AU-27-01 units via authorised channels from our Batam base, with fast delivery across Indonesia and Southeast Asia. Contact us for competitive lead times and request a formal quotation to reserve stock or discuss project requirements.
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