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Littelfuse SE-330HV-21-00 NGR Monitor, High Voltage, DeviceNet
$5,851
Littelfuse SE-330HV-21-00 Neutral Grounding Resistor (NGR) monitor — supports 28–52 VAC / 36–72 VDC supplies, adjustable pickup 2–100% and trip delay 0.1–10 s. Genuine Littelfuse device with conformal coating; fast delivery across Indonesia & Southeast Asia.
The Littelfuse SE-330HV-21-00 is a Neutral Grounding Resistor (NGR) monitor / protection relay engineered for resistance-grounded AC systems. With 28–52 VAC or 36–72 VDC supply capability and adjustable ground-fault pickup (2–100% of CT primary) plus trip time 0.1–10 s, it provides continuous NGR monitoring and ground-fault protection for utilities, substations, industrial motor control, and low-voltage power systems (LVPS). DeviceNet and USB communications make integration with PLC/SCADA and protection schemes straightforward.
Key Features
- 2 Form A (NO) and 2 Form C (changeover) relay contacts for programmable outputs and alarms.
- Selectable fail-safe or non-fail-safe operating mode and conformal coating for harsh environments.
- Wide supply range: 28–52 VAC or 36–72 VDC; front-panel and remote N.O. contact reset options.
- Adjustable pickup (2–100% of CT primary) and adjustable trip delay (0.1–10.0 s) for coordination.
- Communications: DeviceNet and USB for configuration, monitoring and integration; analog 4–20 mA output for process systems.
- Detects shorted NGR conditions, ground faults on the neutral, and includes standard harmonic filtering and universal CT compatibility.
Technical Specifications
| Manufacturer | Littelfuse |
|---|---|
| Commercial Reference | SE-330HV-21-00 |
| Component | Neutral Grounding Resistor Monitor (NGR monitor) |
| Supply Voltage (AC) | 28–52 V AC |
| Supply Voltage (DC) | 36–72 V DC |
| Relay Outputs | 2 Form A (NO), 2 Form C (changeover) |
| Reset | Front-panel and remote N.O. contact reset |
| Communications | DeviceNet, USB |
| Analog Output | 4–20 mA |
| Pulsing Output | Yes (SE-330 series pulsing output) |
| Adjustable Pickup | 2–100% of CT primary (1% increments) |
| Trip Time / Delay | 0.1–10.0 seconds |
| CT Compatibility | Universal CT compatibility |
| Protection / Coating | Conformal coated for harsh environments; harmonic filtering |
Applications
Continuous NGR monitoring and ground-fault detection in resistance-grounded distribution systems; neutral protection on transformers and generators; protective and backup monitoring in substations, industrial plants, mining sites and LV distribution networks.
We supply genuine Littelfuse protection relays through authorized channels from our Batam base, with fast delivery across Indonesia and Southeast Asia. For availability, lead time and competitive pricing, contact us to request a quotation or technical assistance.
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