Protection Relays & Controls Neutral Grounding Resistor Monitoring NGRM-ENC SERIES NGRM-ENC Description The NGRM-ENC Enclosed Neutral-Grounding-Resistor (NGR) Monitor series is a Type 4X enclosure housing a Littelfuse Startco SE-325 or SE-330 Neutral-Grounding-Resistor Monitor and optional accessories that include a 480/600-V control power transformer (CPT), faulted-phase indication (FPI; implemented with an EL3100 Ground-Fault & Phase-Voltage Indicator), earth-leakage panel meter, pulse-enable control, and mounting options. Appropriate fusing is included and field wiring is to terminal blocks. Options SE-325 Neutral-Grounding-Resistor Monitor Measures current and voltage in a transformer or generator neutral-to-ground connection and continuity of the neutral-grounding resistor. SE-330 Neutral-Grounding-Resistor Monitor Advanced ground-fault and neutral-grounding resistor monitoring relay that measures neutral current, neutral-to-ground voltage, and neutral-toground resistance. Simplified Circuit Diagram EL3100 Ground-Fault & Phase-Voltage Indicator Three panel-mounted LEDs indicate the groundfaulted phase. CT EL3100 SE-330 SERIES ER SERIES (Sensing Resistor) (NGR Monitor) NGR DN Panel Meter Panel-mounted meter displays earth leakage current as a percentage of the ground-faultCT-primary rating. DA DB L1 L2 DC NGRM-ENC NGR Assembly (ordered separately) RK-332/RK-302 Remote Indication and Reset Panel-mounted remote indication and reset assemblies are included with SE-325 and surface-mounted SE-330 configurations. (SE-330 with voltage indication shown) Ordering Information The following options are available with a faster shipping time: ORDERING NUMBER PROTECTION RELAY OPTION NGR MONITOR MOUNTING OPTION AMMETER & PULSE CONTROL OPTION COMMS CONTROL-POWER TRANSFORMER OPTION NGRM-ENC-000-01 SE-325 Surface mounted None None CPT NGRM-ENC-200-01 SE-330 (K4=NO) Surface mounted None None CPT NGRM-ENC-201-01 SE-330 (K4=NO) Panel mounted None None CPT NGRM-ENC-201-11 SE-330 (K4=NO) Panel mounted Ammeter None CPT NGRM-ENC-230-01 SE-330 (K4=NO) Surface mounted None Ethernet/2 RJ45 ports CPT NGRM-ENC-231-01 SE-330 (K4=NO) Panel mounted None Ethernet/2 RJ45 ports CPT © 2015 Littelfuse Protection Relays & Controls Rev: 4-D-032515 Based on Manual Rev: 0-B-030515 Protection Relays & Controls Neutral Grounding Resistor Monitoring NGRM-ENC SERIES NGRM-ENC Ordering Information PROTECTION RELAY OPTION NETWORK COMMUNICATIONS OPTION NGR MONITOR MOUNTING OPTION X X X NGRM-ENC- 0=SE-325 1=SE-325 & voltage indication(1) 2=SE-330 (N.O. K4) 3=SE-330 (N.O. K4) & voltage indication(1) 4=SE-330 (N.C. K4) 5=SE-330 (N.C. K4) & voltage indication(1) 6=SE-330HV (N.O. K4) 7=SE-330HV (N.O. K4) & voltage indication(1) 8=SE-330HV (N.C. K4) 9=SE-330HV (N.C. K4) & voltage indication(1) 0=No network communications 1=DeviceNet (2) 3=Ethernet, dual RJ45 (2) 4=Ethernet, 1 RJ45 & 1 fiber (2) 5=Ethernet, dual fiber (2) 6=IEC 61850, dual RJ45 (2) 7=IEC 61850, 1 RJ45 & 1 fiber (2) 8=IEC 61850, dual fiber (2) – AMMETER & PULSE CONTROL OPTION CONTROL-POWER TRANSFORMER OPTION X X 0=No ammeter 0=Surface-mounted NGR monitor (4) 1=Panel-mounted NGR monitor (5) 1=Earth-leakage panel 0=No CPT meter (2) (1) 2=Earth-leakage panel 1=480/600-V CPT meter & pulse-enable switch(3) Note (1) - Includes fuses, (2) - SE-330 models only, (3) - SE-330 models only, excluding SE-330HV models, (4) - Includes panel-mounted indication & reset, and USB connector for SE-330 models, (5) - SE-330 models only; includes IP65 hinged transparent cover Specifications Enclosure Polyester, Lockable. SE-330 panel-mount options are rated to IP65. All other options are rated to Type 4X. DimensionsH 454 mm (17.9”) W 406 mm (16”) D 264 mm (10.4”) Clearance required to open SE-IP65CVR-G 112 mm (4.4”) C CSA US Approvals Warranty 1 year © 2015 Littelfuse Protection Relays & Controls Rev: 4-D-032515 Based on Manual Rev: 0-B-030515