Datasheet

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