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Littelfuse SE-330-28-00 NGR Monitor, 48VDC, Dual SC Fiber, IEC 61850, NO
$5,171$6,205 (-17%)
Littelfuse SE-330-28-00 Neutral Grounding Resistor (NGR) Monitor — IEC protection relay supporting 28–52 VAC / 36–72 VDC (48 VDC operation). Continuous NGR and ground-fault detection with communications options. Genuine Littelfuse unit from Batam with fast delivery across Indonesia & Southeast Asia.
The Littelfuse SE-330-28-00 is an NGR (Neutral Grounding Resistor) monitor and protection relay engineered to supervise resistance-grounded AC systems. Supporting 28–52 V AC and 36–72 V DC (commonly used with 48 VDC supplies), it provides adjustable ground-fault pickup and time delays, resistor-fault detection and analog/pulse outputs. Suited for substation, transformer neutral and generator neutral protection, it integrates into IEC 61850-capable protection schemes for utility and industrial distribution networks.
Key Features
- Continuous NGR monitoring with shorted-NGR detection to prevent hidden neutral faults.
- Adjustable ground-fault pickup from 2–100% for selectable sensitivity and false-trip avoidance.
- Configurable time delays: fast GF trip and adjustable delay (typical range 0.1–10 s) for coordination.
- Resistor-fault detection (RF) with defined trip response to remove transient overvoltage risk.
- Analog 4–20 mA output and pulsing output (SE-330 specific) plus programmable output contacts.
- Universal CT compatibility, conformal coating for harsh environments, and IEC 61850 / fiber communications options.
Technical Specifications
| Manufacturer | Littelfuse |
|---|---|
| Commercial Reference | SE-330-28-00 |
| Component | Neutral Grounding Resistor Monitor (NGR Monitor) |
| Supply Voltage | 28–52 V AC; 36–72 V DC (supports 48 VDC) |
| Ground-fault Pickup | Adjustable 2–100% |
| Ground-fault Trip / Time Delay | Adjustable, typical 0.1–10.1 s (configuration 0.1–10 s) |
| Resistor-fault Trip Time | Approx. 12 s |
| Outputs | Analog 4–20 mA; pulsing output (SE-330); programmable relay contacts |
| CT Compatibility | Universal CT compatible |
| Environmental | Conformal coating |
| Communications | IEC 61850-ready; fiber options (dual SC) available |
Applications
Protection and supervision of transformer and generator neutrals, NGR health monitoring in substations, utility distribution networks, and industrial plants where resistance-grounded systems require early detection of ground faults and resistor failures.
We supply genuine Littelfuse SE-330-28-00 units through authorized distribution channels. Based in Batam, we deliver quickly across Indonesia and Southeast Asia. Contact us for a fast quotation and availability — competitive lead times and local support for protection relay projects.
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