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To ensure accuracy, please note that images may be representative. Refer to the product data sheet for detailed specifications.
| Manufacturer | Startco / Littelfuse |
| Manufacturer Product Number | SE-330HV-21-01 |
| Description | Ground Fault Relay; 48 Vdc; Two Form A and two Form C |
| Datasheet | Download Datasheet |
The Littelfuse Startco SE-330HV-21-01 is a high-voltage neutral-grounding-resistor monitor with a 48 Vdc supply.
It provides ground-fault and NGR monitoring: neutral current, neutral-to-ground voltage and neutral-to-ground resistance; detects an open or shorted NGR with or without a ground fault present.
Settings: GF trip level 2-100% of CT-Primary Rating in 1% increments; GF trip time 0.1-10 s; Vn trip level 20-2,000 Vac (≤5 kV systems) 100-10,000 Vac (>5 kV systems). Applications: 72 kV applications. Sensing: current transformer required (ELCT5 / ELCT30 series or other CT with 1- or 5-A secondary); ER series sensing resistor (required).
Outputs: two Form A and two Form C. Analog output: 4-20 mA, self or loop powered. Communications: Mini USB (standard); DeviceNet. Indication: 100-event trip recorder (date and time); microSD data logging (card included). Harmonic filtering: standard feature (DFT).
Mounting: panel and surface (optional). Size: H 213 mm (8.4"); W 98 mm (3.9"); D 132 mm (5.2"). Conformally coated as standard.
Approvals: CSA certified, UL Listed (E340889), CE (European Union), RCM (Australian).
| Category | |
| Manufacturer | Startco / Littelfuse |
| Model | SE-330HV |
| Monitoring Function | Ground-fault and NGR monitoring: neutral current, neutral-to-ground voltage and neutral-to-ground resistance; detects an open or shorted NGR with or without a ground fault present |
| System Voltage | 72 kV applications |
| Ground Fault Current Range | GF trip level 2-100% of CT-Primary Rating in 1% increments; GF trip time 0.1-10 s; Vn trip level 20-2,000 Vac (≤5 kV systems) 100-10,000 Vac (>5 kV systems) |
| Required Accessories | Required (ELCT5 / ELCT30 Series or other CT with 1- or 5-A secondary); ER Series Sensing Resistor (Required) |
| Input Voltage | 48 Vdc |
| Communication Protocol | Mini USB (standard); DeviceNet |
| Analog Output | 4-20 mA, self or loop powered |
| IEEE Device Numbers | Ground Fault (50G/N, 51G/N, 59N), Checking Relay (3), Lockout Relay (86) |
| Harmonic Filtering | Standard feature (DFT) |
| Conformal Coating | Standard feature |
| Status Indicator | 100-event trip recorder (date and time); microSD data logging (card included) |
| Contact Configuration | Two Form A and two Form C |
| Mounting Type | Panel and Surface (optional) |
| Dimensions | H 213 mm (8.4"); W 98 mm (3.9"); D 132 mm (5.2") |
| Approvals | CSA certified, UL Listed (E340889), CE (European Union), RCM (Australian) |