Protection Relays & Controls
Ground-Fault Protection–Grounded Systems
SE-701 SEriES (PGr-5701)
Ground-Fault Monitor
Description
The SE-701 is a microprocessor-based ground-fault relay for resistance-
and solidly-grounded systems. In addition to common systems, it is
uniquely suited for use on systems with significant harmonic content.
The SE-701 can provide main-plant protection, feeder-level protection,
or individual-load protection. Proper current transformer selection
provides the desired pickup range. The output contacts can be
connected for use in protective tripping circuits or in alarm indication
circuits. The analog output can be used with a PLC or a meter.
Features & Benefits
FEaturES
Adjustable pickup
(1-99%)
Adjustable time delay
(50 ms - 2.5 s)
Output contacts
Analog output
(0 - 5 V)
CT-Loop monitoring
Selectable DFT or peak
detection filtering
Harmonic filtering
Non-volatile trip
memory
Microprocessor based
Universal power supply
bEnEFitS
Trip setting based on input CT primary, allows use with
any CT. Minimum 50 mA with EFCT Series.
Adjustable trip delay allows quick protection and system
coordination
Form A and Form B ground-fault output contacts for
operation of separate annunciation and trip circuits
Allows for connecting an optional meter (PGA-0500) or a
control system
Alarms when CT is not connected
Compatible with variable-speed drives
Eliminates nuisance tripping
Retains trip state while de-energized to simplify
troubleshooting
No calibration required, saves on maintenance cost
Allows operation in application where one side of PT is
faulted, provides flexibility for numerous applications
Simplified Circuit Diagram
CT
A
A
GROUNDED B
SUPPLY
C
Accessories
SE-701 SERIES
A
L1
L2
(Ground-Fault Monitor)
Ground-Fault Current Transformer
Required current transformer model depends on
application. We offer a variety of sensitive CTs with
5- and 30-A primaries.
PGA-0500 Analog % Current Meter
Optional panel-mounted analog meter displays
ground-fault current as a percentage of the CT
primary rating.
B
Ordering Information
OrdErinG numbEr
cOntrOl POwEr
Specifications
120/240 Vac/Vdc
12/24 Vdc
48 Vdc
24 Vac
rEquirEmEnt
SE-701-OU
SE-701-OD
SE-701-OT
SE-701-O3
accESSOriES
Current Transformer
PGA-0500
PMA-55, PMA-60
SE-EFVC Voltage Clamp
Required
Optional
Optional
Optional
IEEE Device Numbers
Input Voltage
Dimensions
Trip Level Settings
Trip Time Settings
Contact Operating Mode
Harmonic Filtering
Test Button
Reset Button
CT-Loop Monitoring
Output Contacts
Approvals
Analog Output
Conformally coated
Warranty
Mounting
Note: For optional conformal coating please consult factory.
Ground fault (50G/N, 51G/N)
See ordering information
H
75 mm (3.0");
W
55 mm (2.2");
D
115 mm (4.5")
1-99% CT-Primary Rating
0.05-2.5 s
Selectable fail-safe or non-fail-safe
Standard feature
Standard feature
Standard feature
Standard feature
Isolated Form A and Form B
CSA certified, UL Listed (E340889),
CE (European Union), C-Tick (Australian)
0-5 V
Consult factory
5 years
DIN, Surface (standard)
Panel (with PMA-55 or PMA-60 adapter)
Rev: 4-A-050213
Based on Manual Rev 10-A-041213
© 2013 Littelfuse Protection Relays & Controls
Littelfuse.com/se-701
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