Littelfuse SE-704 User Manual
Protection Relays & Controls
Ground-Fault Protection–Grounded Systems
SE-704 SERIES (PGR-4704)
Earth-Leakage Monitor
Simplified Circuit Diagram
CT
A
A
GROUNDED
SUPPLY
B
C
Description
The SE-704 is a microprocessor-based ground-fault relay for resistanceand 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.
Features & Benefits
FEATURES BENEFITS
Adjustable pickup
(10 mA - 5 A)
Adjustable time delay
(30 ms - 2.0 s)
Output contacts
Analog output
(0 - 5 V)
CT-Loop monitoring Alarms when CT is not connected
Selectable contact
operating mode
Harmonic filtering Eliminates nuisance tripping
Non-volatile trip
memory
Microprocessor based No calibration required saves maintenance cost
Universal
power supply
Adjustable trip setting provides a wide range of low-level
protection and system coordination
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
control system
Selectable fail-safe or non-fail-safe operating modes
allows connection to shunt or undervoltage breaker coil
Retains trip state when de-energized to simplify
troubleshooting
Allows operation in application where one side of PT is
faulted, provides flexibility for numerous applications
SE-704 SERIES
L1
L2
(Earth-Leakage Monitor)
Ordering Information
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
ACCESSORIES REQUIREMENT
SE-CS30 Series Required
PGA-0500 Optional
PMA-55, PMA-60 Optional
Note: For o ptional conform al coating please consul t factory.
Accessories
A
B
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 groundfault current as a percentage of the set-point or 5 A.
Specifications
IEEE Device Numbers Ground fault (50G/N, 51G/N)
Input Voltage See ordering information
Dimensions
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)
H 75 mm (3.0"); W 55 mm (2.2"); D 115 mm (4.5")
© 2013 Littelfuse Protection Relays & Controls
Littelfuse.com/se-704
Based on Manual Rev 7-A-040813
Rev: 4-A-050213
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