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Littelfuse SE-330AU-21-00 NGR Monitor 48VDC DeviceNet NO Relay
$5,171$6,205 (-17%)
Littelfuse SE-330AU-21-00 neutral-earthing-resistor monitor — protection relay supporting 28–52 VAC / 36–72 VDC (48 VDC compatible) with 2 Form A + 2 Form C contacts. Genuine Littelfuse device; fast delivery from Batam across Indonesia & Southeast Asia.
The Littelfuse SE-330AU-21-00 is a neutral-earthing-resistor monitor and earth-fault protection relay designed for resistance-grounded AC systems. Rated for 28–52 VAC and 36–72 VDC supplies (including 48 VDC operation), it provides continuous neutral-to-earth current, voltage and resistance supervision with 2 Form A and 2 Form C contacts. Built for fail-safe protection and integration via DeviceNet or USB, it is ideal as an earth-fault relay in transformer, generator and industrial power distribution applications.
Key Features
- Continuous monitoring of neutral current, neutral-to-earth voltage and neutral-to-earth resistance.
- 2 Form A (normally open) and 2 Form C (changeover) output contacts for alarm and trip functions.
- Fail-safe operation with front-panel and remote normally-open contact reset options.
- Conformal coating for enhanced protection in industrial environments and standard harmonic filtering.
- Communication options include DeviceNet and USB for easy integration into protection and control networks.
- Ground-fault (GF) and resistor-fault (RF) trip functions with adjustable trip ranges and response times.
Technical Specifications
| Manufacturer | Littelfuse |
|---|---|
| Commercial Reference | SE-330AU-21-00 |
| Component | Neutral Grounding Resistor Monitor |
| Supply Voltage | 28–52 VAC; 36–72 VDC |
| Contacts | 2 Form A + 2 Form C |
| Communication | DeviceNet, USB |
| Protection / Coating | Conformal coated |
| GF Trip Time | 0.1–0.5 s |
| RF Trip Time | 12 s |
| Trip Levels | RF trip: 0.125–30.0 A (systems ≤5 kV); voltage range 20–2000 V (systems >5 kV) |
Applications
Designed for low- and medium-voltage transformers, generator neutral monitoring, neutral-earthing resistor supervision, and industrial/substation distribution protection. Suitable where continuous verification of the neutral-earthing resistor and earth-fault detection are required.
We supply genuine Littelfuse protection relays via authorized distribution channels from our base in Batam. Fast delivery across Indonesia and Southeast Asia, competitive commercial terms and local support. Contact us today to request a quotation or technical assistance for the SE-330AU-21-00.
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