Littelfuse SE-703 User Manual
Protection Relays & Controls
Ground-Fault Protection–Grounded Systems
SE-703 SERIES
Earth-Leakage Monitor
Simplified Circuit Diagram
CT
A
GROUNDED
SUPPLY
A
B
C
Description
The SE-703 is a microprocessor-based ground-fault relay for resistanceand 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.
Features & Benefits
FEATURES BENEFITS
Adjustable pickup
(25 - 500 mA)
Adjustable time delay
(50 - 500 ms)
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
allow connection to shunt or undervoltage breaker coil
Retains trip state while de-energized to simplify
troubleshooting
Allows operation in application where one side of PT is
faulted, provides flexibility for numerous applications
SE-703 SERIES
L1
L2
(Earth-Leakage Monitor)
Ordering Information
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
ACCESSORIES REQUIREMENT
EFCT Series Required
PGA-0500 Optional
PMA-55, PMA-60 Optional
SE-EFVC Voltage Clamp Optional
Note: For o ptional conformal coa ting please consul t factory.
Accessories
A
B
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 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 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
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)
H 75 mm (3.0"); W 55 mm (2.2"); D 115 mm (4.5")
CSA certified
, UL Listed (E340889), CE (European Union),
© 2013 Littelfuse Protection Relays & Controls
Littelfuse.com/se-703
Based on Manual Rev 10-A-042313
Rev: 4-A-050213
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