Neutral Earth Resistor Monitor

SE-325 Series

Added to List
  • 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

Makes Perfect Sense

Exceptional choice, exclusive ranges, high stock levels, excellent value and a passion for expert personal service. Why would you look anywhere else for your electrical, lighting, air conditioning and refrigeration needs?

60

YEARS PROVIDING EXPERT SOLUTIONS