Neutral Earth Resistor Monitor
SE-325 Series
- Detects resistor failure within seconds
- High-resistance-earthed system using a neutral-earthing resistor with a low let-through current to limit earth fault current
Description
The Littelfuse SE-325 Neutral Earthing Resistor Monitor is used on resistance-earthed systems up to 25 kV to monitor the integrity of the neutral-to-earth path and to detect earth faults.
One of the leading types of neutral earthing products, the monitor measures current and voltage in a transformer or generator neutral-to-earth connection and continuity of the neutral-earthing resistor (NGR). The SE-325 coordinates these three measurements to detect a loose connection, corrosion, earth fault, or NGR failure, and provides one alarm or trip output contact.
We are the exclusive NSW supplier of Littelfuse protection relays and controls for the protection, safe control and distribution of electrical power in industrial applications.
Continuous NGR monitoring
Detects resistor failure within seconds, reduces transient-overvoltage risk, removes risk of earth fault detection failure.
Earth Fault Detection
Main or backup protection to detect an earth fault anywhere on the monitored system.
Adjustable pickup (0.5-4 A)
Select greatest sensitivity without false operation.
Adjustable time delay (0.1-2 s)
Adjustable trip delay allows system coordination
Output contacts
Form A output contact.
Selectable contact operating mode
Selectable fail-safe or non-fail-safe operating modes allows connection to shunt or undervoltage breaker coil or alarm system.
Data Sheets and Manuals
SE-325 Data SheetSE-325 Manual
CAD Drawings and Models
SE-325 CAD DrawingER-600VC CAD DrawingER-25kv CAD DrawingRK-302 CAD DrawingRK-325 CAD Drawing
