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Littelfuse SE-330AU-07-00 NGR Monitor Universal SC Fiber RJ45 IEC 61850
$4,923$5,907 (-17%)
Littelfuse SE-330AU-07-00 neutral grounding resistor monitor (NGR monitor) for resistance-grounded AC systems, 65–265 VAC / 85–275 VDC supply, with IEC 61850 and USB communications. Genuine Littelfuse part — fast delivery from Batam across Indonesia & Southeast Asia.
The Littelfuse SE-330AU-07-00 is a neutral grounding resistor monitor (NGR monitor) and protection relay designed for resistance-grounded AC systems and low- to medium-voltage transformers and generators. Rated for 50–60 Hz operation with wide auxiliary supply options (65–265 VAC / 85–275 VDC), it delivers continuous neutral-to-earth current, voltage and resistance supervision. Ideal for earth-fault protection, transformer/generator protection and NER integrity checks with IEC 61850 communication support.
Key Features
- Continuous monitoring of neutral current, neutral-to-earth voltage and neutral-to-earth resistance to detect open or degraded NERs.
- Wide supply range: supports both 65–265 VAC and 85–275 VDC auxiliary supplies for flexible installation.
- Communication options include USB and IEC 61850 with fiber/RJ45 physical interfaces for substation integration.
- Fail-safe operation with front-panel switch or remote N.O. contact reset for secure reset control.
- Built-in harmonic filtering and configurable protection logic; provides multiple ANSI/IEEE device functions (50G/50N/51G/51N/59N/86).
- Multiple relay outputs: 2 Form A and 2 Form C contacts for signaling and trip interfaces.
Technical Specifications
| Manufacturer | Littelfuse |
|---|---|
| Commercial Reference | SE-330AU-07-00 |
| Component | Neutral Grounding Resistor Monitor (NGR monitor) |
| Supply Voltage | 65–265 VAC; 85–275 VDC |
| Frequency | 50–60 Hz |
| Communications | USB, IEC 61850 (fiber / RJ45) |
| Relay Contacts | 2 Form A / 2 Form C |
| Reset | Front-panel switch or remote N.O. contact |
| Monitored Parameters | Neutral current, neutral-to-earth voltage, neutral-to-earth resistance |
| Harmonic Filtering | Standard harmonic filtering |
| Functions (IEEE/ANSI) | 50G, 50N, 51G, 51N, 59N, 86 |
Applications
Monitoring neutral grounding resistors on generators and transformers, earth-fault detection in distribution networks, protection for industrial plants using resistance-grounded systems, and substation automation with IEC 61850 communications.
We supply genuine Littelfuse protection relays through authorized channels. Based in Batam, we serve customers across Indonesia and Southeast Asia with fast delivery and competitive pricing. Contact us to request a quotation or technical assistance for the SE-330AU-07-00.
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