Protection Relays and Controls Neutral-Grounding-Resistor Monitoring SE-325 SERIES (PGM-8325) Neutral-Grounding-Resistor Monitor Description 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. Features & Benefits FEATURES BENEFITS Detects resistor failure within seconds, reduces Continuous NGR transient-overvoltage risk, removes risk of ground- monitoring fault-detection failure Ground-fault Main or backup protection to detect a ground Detection fault anywhere on the monitored system Adjustable pickup Select greatest sensitivity without (0.5 - 4 A) false operation Adjustable time delay Simplified Circuit Diagram Adjustable trip delay allows system coordination (0.1 - 2 s) Output contacts Form A output contact Selectable fail-safe or non-fail-safe operating Selectable contact modes allows connection to shunt or undervoltage operating mode breaker coil or alarm system Accessories ER Series Sensing Resistor CT A Required interface between the power B system and the SE-325. Eliminates ER SERIES hazardous voltage levels at the monitor. (Sensing Resistor) SE-325 SERIES (NGR Monitor) NGR CT200 Series Current Transformer B L1 A Required CT detects ground-fault current. L2 RK Series Remote Indication and Reset Optional panel-mounted remote indication and reset assemblies. Available in NEMA 1 or NEMA 4 configurations. Ordering Information ORDERING NUMBER CONTROL POWER Specifications IEEE Device Numbers Ground Fault (50G/N, 51G/N), SE-325 120 Vac Overvoltage (59N), Lockout Relay (86), SE-325D 120 Vac/Vdc Checking Relay (3) Input Voltage See ordering information SE-325E 240 Vac D im en s i o n s H 150 mm (5.9 ) W 109 mm (4.3 ) Consult manual online for additional ordering options. D 100 mm (4.0 ) GF Trip Level Settings 0.5-4.0 A ACCESSORIES REQUIREMENT GF Trip Time Settings 0.1-2.0 s RF Trip-Level Settings 20-400 Vac (5 kV systems) CT200 Series Required 100-2,000 Vac (>5 kV systems) Contact Operating Mode Selectable fail-safe or non-fail-safe ER Series Required Reset Button Standard feature SE-MRE-600 Optional Output Contacts Form A Approvals CSA certified, UL Listed (E340889), RK-325, RK-325I, RK-302 Optional C-Tick (Australian) RK-13 Optional Conformally coated Standard feature Warranty 5 years NGRM-ENC Optional Mounting Surface 2016 Littelfuse Protection Relays & Controls Rev: 4-B-102214 Littelfuse.com/se-325 Based on Manual Rev:13-C-092314X-ON Electronics Largest Supplier of Electrical and Electronic Components Click to view similar products for Industrial Relays category: Click to view products by Littelfuse manufacturer: Other Similar products are found below : 6-1617801-8 6-1618107-9 7-1618273-3 EV250-4A-02 EV250-6A-01 FCA-125-CX8 FCA-325-159 FCA-410-138 8000-S3121 8-1618273-6 8-1618393-1 GCA63A220VAC60HZ GCA63A277VAC60HZ GCA63A600VAC60HZ 1-1672275-3 1-1833005-4 H-16/S1 A711Z ACC530U20 ACC633U30 ACC730U30 DH18DA 1423675-8 AVR907 15732A200 B07B032AC1-0329 B329 B490A 1618279-1 BHR124Y 1810DDB-SX N417 P30C42A12D1-120 2-1617748-6 2-1618396-6 2-1618398-1 JMGACD-5M JMGSC-5LW JMGSCD-5L PBO-18A1218 PBO-40A3040 K8DSPH1200480VAC KA-3C-12A RT334012WG S160156115 SAH159 2944795 301-17SX 1618105-2 1618112-6