SE-703 Datasheet, PDF (1/1 Pages) Littelfuse – The SE-703 is a microprocessor-based earth-fault

Protection Relays and Controls
Ground-Fault Protection–Grounded Systems
SE-703 SERIES
Earth-Leakage Monitor
Simplified Circuit Diagram
GROUNDED ^A
SUPPLY
B
C
CT A
SE-703 SERIES
(Output contacts
L1
(Earth-Leakage Monitor)
vary by model)
L2
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-703-03
SE-703-xx-00¹
SE-703-xx-02^1,2
24 Vac
As above
As above
ACCESSORIES
EFCT Series
PGA-0500
PMA-55
PMA-60
SE-EFVC Voltage Clamp
REQUIREMENT
Required
Optional
Optional
Optional
Optional
NOTES:
1 Two Form C contacts. CSA and UL certification pending.
2 Selectable fail-safe/non-fail-safe operating modes (AS/NZS 2081:2002 compliant)
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Description
The SE-703 is a microprocessor-based earth-fault relay for resistance-
and solidly earthed systems. It offers sensitive earth-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
AS/NZS 2081 compliant to either 2011 or 2002 (see ordering options).
Features & Benefits
FEATURES
Adjustable pickup
(25 - 500 mA)
Adjustable time delay
(INST- 500 ms)
Output contacts
Analog output
(0 - 5 V)
CT-Loop monitoring
BENEFITS
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 or 2 Form C ground-fault output
contacts for operation of separate annunciation and
trip circuits
Allows for connecting an optional meter (PGA-0500) or
control system
Alarms when CT is not connected
Contact operating
mode
Fail-safe operating mode for undervoltage applications,
optional non-fail-safe mode available
Harmonic filtering
Eliminates nuisance tripping
Non-volatile trip
memory
Microprocessor based
Retains trip state while de-energized to simplify
troubleshooting
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
Accessories
A
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.
PMA-60 Series – Mounting Adapter
Required when panel mounting for AS/NZS 2081:2011
compliance
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
INST-500 ms
Contact Operating Mode Fail-safe unless noted
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 unless noted
Approvals
CSA certified, UL Listed (E340889),
Compliance
CE (European Union), RCM (Australian) unless noted
AS/NZS 2081:2011 unless noted
Analog Output
Conformally coated
Warranty
Mounting
0-5 V
Yes
5 years
DIN, Surface (standard)
Panel (with PMA-55 or PMA-60 adapter)
Rev: 4-C-032917
Based on Manual Rev 12-A-031017