Protection Relays & Controls
© 2013 Littelfuse Protection Relays & Controls
Littelfuse.com/se-703
Ground-Fault Protection–Grounded Systems
Description
The SE-703 is a microprocessor-based ground-fault relay for resistance-
and solidly-earthed systems. It offers sensitive ground-fault detection as
low as 25 mA and can be used on systems with significant harmonic
content. The SE-703 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. The SE-703 is specifically designed to be
Australian AS/NZS 2081 compliant.
SE-703 SERIES
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 25-500 mA
Trip Time Settings 50-500 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
CSA certified
, UL Listed (E340889), CE (European Union),
C-Tick (Australian)
Compliance AS/NZS 2081:2002
Analog Output 0-5 V
Conformally coated Consult factory
Warranty 5 years
Mounting DIN, Surface (standard)
Panel (with PMA-55 or PMA-60 adapter)
ORDERING NUMBER CONTROL POWER
SE-703-OU 120/240 Vac/Vdc
SE-703-OD 12/24 Vdc
SE-703-OT 48 Vdc
SE-703-O3 24 Vac
Ordering Information
Simplified Circuit Diagram
FEATURES BENEFITS
Adjustable pickup
(25 - 500 mA)
Adjustable trip setting provides a wide range of low-level
protection and system coordination
Adjustable time delay
(50 - 500 ms)
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
allow connection to shunt or undervoltage breaker coil
Harmonic filtering Eliminates nuisance tripping
Non-volatile trip
memory
Retains trip state while 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
EFCT Series Required
PGA-0500 Optional
PMA-55, PMA-60 Optional
SE-EFVC Voltage Clamp Optional
Accessories
EFCT Series Ground-Fault Current Transformer
Required zero-sequence current transformer
specifically designed for low-level detection.
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-703 SERIES
(Earth-Leakage Monitor)
A
B
C
Rev: 4-A-050213
Based on Manual Rev 10-A-042313
(1 pages)
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Commentaires sur ces manuels