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Littelfuse SE-330AU-21-01 NGR Monitor 48VDC DeviceNet NC Relay
$5,171$6,205 (-17%)
Littelfuse SE-330AU-21-01 Neutral-Earthing-Resistor Monitor (48 VDC) — protection relay for resistance-grounded systems, GF/RF monitoring with DeviceNet/USB and 4–20 mA output. Genuine Littelfuse product, stocked in Batam with fast delivery across Indonesia & SEA.
The Littelfuse SE-330AU-21-01 Neutral-Earthing-Resistor Monitor is a protection relay designed for resistance-grounded AC systems. This neutral-earthing resistor monitor (commercial reference SE-330AU-21-01) supports 48 VDC operation and provides continuous neutral current, neutral-to-earth voltage and resistance supervision. Ideal for earth-fault protection and system integrity checks in medium- and low-voltage switchgear, transformers and generator neutrals, it is a dedicated earth-fault/neutral monitoring relay with DeviceNet/USB communications.
Key Features
- Conformally coated electronics for reliable operation in industrial environments.
- Multiple contact configurations: 1 Form A, 1 Form B and 2 Form C for flexible signalling.
- Communications via USB and DeviceNet plus 4–20 mA analog output for integration.
- Wide supply-voltage support (model variants cover 28–72 VDC); this listing for 48 VDC units.
- Adjustable GF trip 0.125–30.0 A and RF trip level ranges for systems up to and above 5 kV; RF trip time set to 12 s.
- Front-panel or remote N.O. contact reset and fail-safe operation to ensure safe responses.
Technical Specifications
| Manufacturer | Littelfuse |
|---|---|
| Commercial Reference | SE-330AU-21-01 |
| Component | Neutral Grounding Resistor Monitor |
| Supply Voltage | Variants 28–52 VDC and 36–72 VDC (this listing: 48 VDC) |
| Contact Configurations | 1 Form A, 1 Form B, 2 Form C |
| Analog Output | 4–20 mA |
| Communications | USB, DeviceNet |
| Ground-Fault (GF) Trip Range | 0.125–30.0 A |
| Resistor-Fault (RF) Trip Range | 20–2,000 V (systems ≤5 kV); 100–10,000 V (systems >5 kV) |
| RF Trip Time | 12 seconds |
| Coating | Conformal coating |
| Reset | Front-panel switch or remote N.O. contact |
| Suitable For | Resistance-grounded AC systems, transformers, generator neutrals |
| Revision | New revision available |
Applications
Continuous neutral-earthing resistor monitoring on distribution transformers, earth-fault detection in generator neutral systems, protection in switchgear for industrial plants, and safety supervision in medium-voltage distribution networks.
We supply genuine Littelfuse relays through authorised channels from our Batam warehouse, with fast delivery across Indonesia and Southeast Asia. Competitive sourcing and technical support available — contact us to request a quotation for the SE-330AU-21-01 today.
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