Protection Relays & Controls
© 2013 Littelfuse Protection Relays & Controls
Littelfuse.com/se-704
Ground-Fault Protection–Grounded Systems
Description
The SE-704 is a microprocessor-based ground-fault relay for resistance-
and solidly-grounded systems. It offers very sensitive ground-fault
detection as low as 10 mA and can be used on systems with
significant harmonic content. The SE-704 provides feeder-level
protection or individual-load protection. 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.
SE-704 SERIES (PGR-4704)
Earth-Leakage Monitor
Specifications
IEEE Device Numbers Ground fault (50G/N, 51G/N)
Input Voltage See ordering information
Dimensions
H 75 mm (3.0"); W 55 mm (2.2"); D 115 mm (4.5")
Trip Level Settings 10 mA-5.0 A
Trip Time Settings 30-2000 ms
Contact Operating Mode Selectable fail-safe or non-fail-safe
Harmonic Filtering Standard feature
Test Button Standard feature
Reset Button Standard feature
CT-Loop Monitoring Standard feature
Output Contacts Isolated Form A and Form B
Approvals UL Listed (E340889), CSA, C-Tick (Australian)
Analog Output 0-5 V & 0-1 mA
Conformally coated Consult factory
Warranty 5 years
Mounting DIN, Surface (standard)
Panel (with PMA-55 or PMA-60 adapter)
ORDERING NUMBER CONTROL POWER
SE-704-0U 120/240 Vac/Vdc
SE-704-0D 12/24 Vdc
SE-704-0T 48 Vdc
SE-704-O3 24 Vac
Ordering Information
Simplified Circuit Diagram
FEATURES BENEFITS
Adjustable pickup
(10 mA - 5 A)
Adjustable trip setting provides a wide range of low-level
protection and system coordination
Adjustable time delay
(30 ms - 2.0 s)
Adjustable trip delay allows quick protection and system
coordination
Output contacts
Form A and Form B ground-fault output contacts for
operation of separate annunciation and trip circuits
Analog output
(0 - 5 V)
Allows for connecting an optional meter (PGA-0500) or
control system
CT-Loop monitoring Alarms when CT is not connected
Selectable contact
operating mode
Selectable fail-safe or non-fail-safe operating modes
allows connection to shunt or undervoltage breaker coil
Harmonic filtering Eliminates nuisance tripping
Non-volatile trip
memory
Retains trip state when de-energized to simplify
troubleshooting
Microprocessor based No calibration required saves maintenance cost
Universal
power supply
Allows operation in application where one side of PT is
faulted, provides flexibility for numerous applications
Features & Benefits
Note: For optional conformal coating please consult factory.
ACCESSORIES REQUIREMENT
SE-CS30 Series Required
PGA-0500 Optional
PMA-55, PMA-60 Optional
Accessories
SE-CS30 Series Ground-Fault Transformer
Required zero-sequence current transformer
specifically designed for low level detection. Flux
conditioner is included to prevent saturation.
PGA-0500 Analog % Current Meter
Optional panel-mounted analog meter displays ground-
fault current as a percentage of the set-point or 5 A.
A
A
B
CT
L2
L1
GROUNDED
SUPPLY
SE-704 SERIES
(Earth-Leakage Monitor)
A
B
C
Rev: 4-A-050213
Based on Manual Rev 7-A-040813
(3 pages)
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