SE-325EN - SE-325 Series

Series: SE-325 Questions? Contact Littelfuse Support
Roll Over to Zoom

The SE-325 Neutral-Grounding-Resistor Monitor is used on resistance-grounded systems up to 25 kV to monitor the integrity of the neutral-to-ground path and to detect ground faults. It measures current and voltage in a transformer or generator neutral-to-ground connection and continuity of the neutral-grounding resistor (NGR). The SE-325 coordinates these three measurements to detect a loose connection, corrosion, ground fault, or NGR failure, and provides one alarm or trip output contact.

Property (Mouseover for details) Value
Approvals CSA
Relay Contacts One Form A (N.O.)
Supply Voltage (VAC) 240

pdf icon SE-325 Datasheet

pdf icon SE-325 Manual

A high-resistance-grounded system uses a neutralgrounding resistor (NGR) with a low let-through current to limit ground-fault current. This is an improvement over low-resistance- or solidly grounded systems because, in those systems, a ground-fault flash hazard exists and a ground fault can result in substantial point-of-fault damage.

pdf icon SE-325 Manual Russian

pdf icon SE-325 Cross Reference Russian

pdf icon SE-325 Manual Chinese

SE-325 CAD Drawing

ER-600VC CAD Drawing

ER-25kv CAD Drawing

Littelfuse Protection Relays RK-302 CAD Drawing

Littelfuse Protection Relays RK-325 CAD Drawing

pdf icon Littelfuse Protection Relays Monitoring NGRs TN

Monitoring Neutral-Grounding Resistors—An Update...