Littelfuse SE-145 User Manual
Protection Relays & Controls
Trailing Cable Protection–Ground-Fault Ground-Check Monitoring
SE-145 SERIES
Ground-Fault Ground-Check Monitor
Description
The SE-145 is a three-channel, microprocessor-based,
combination ground-wire monitor and ground-fault relay for
resistance-grounded or solidly grounded systems. It continuously
monitors the integrity of the ground wire to protect portable
equipment from hazardous voltages caused by ground faults. The
SE-145 is designed for use on three-way splitter box applications.
Features & Benefits
FEATURES BENEFITS
Adjustable pickup
(0.5 - 12.5 A)
Adjustable time delay
(1 - 2.5 s)
Simplified Circuit Diagram
CT
BA
GROUNDED
L1
L2
SUPPLY
SE-145
SERIES
(Ground-Fault
Ground-Check
Monitor)
CHANNEL A
TRIP A
CHANNEL B
CHANNEL C
A
B
C
GC
G
Application Diagram
SUBSTATION
SE-135
L1
L2
SPLITTER
BOX
GC
G
MODEM
SE-TA12A
GC A
COMM
SE-145
TRIP A
TRIP B
TRIP C
GC
G
GC C
Ordering Information
TRAILING
CABLE
G A
GC B
G B
G C
M
TERMINATION
DEVICE
C
LOAD A
SE-TA12A
GC
G
LOAD B
SE-TA12A
GC
G
LOAD C
SE-TA12A
GC
G
C
C
C
Output contacts
Ground-check
LED indication
CT-Loop monitoring
High-induced-ac
rejection
DFT (harmonic) filter
Zener-characteristic
termination assembly
Fail-safe circuits
Conformal coating
Accessories
A
B
C
Unit can be used on a wide variety of trailing cable
applications
Adjustable trip delay for quick protection and system
coordination
Separate annunciation of ground-fault and groundcheck faults
Indication of open or short ground-check wire
makes it easier to find faults
Alarms when CT is not connected
Makes unit suitable for applications with high
voltages and long cables
Prevents false operation
Provides reliable ground-check loop verification
Ensures ground-check and ground-fault circuits
remain safe even in the event of equipment failure
Additional coating protects circuit boards against
harsh environment
SE-CS10 Series Ground-Fault Current
Transformer
Zero-sequence current transformer detects
ground-fault current. Provides 0.5 to 12.5 A
trip range.
SE-CS40 Series Ground-Fault Current
Transformer
Zero-sequence current transformer detects
ground-fault current. Provides 2.0 to 50 A
trip range.
SE-TA12A Series Termination Assembly
Required termination assembly; temperature
compensated.
ORDERING NUMBER CONTROL POWER COMM
SE-145-00-00 120/240 Vac; 110-250 Vdc –
SE-145-03-00 120/240 Vac; 110-250 Vdc Modbus® TCP
SE-145-30-00 24 Vdc Battery Back-up –
SE-145-33-00 24 Vdc Battery Back-up Modbus® TCP
ACCESSORIES REQUIREMENT
SE-CS10 or SE-CS40 Series Required
SE-TA12A Series Required
RK-132 Optional
See Current Transformer Selection Guide and Accessory Information.
© 2013 Littelfuse Protection Relays & Controls
Littelfuse.com/se-145
Specifications
IEEE Device Numbers Checking or Interlocking Relay (3GC),
Ground fault (50G/N, 51G/N)
Input Voltage 60-265 Vac, 60VA; 82-275 Vdc, 45W;
18-30Vdc, 45W
Dimensions H 213 mm (8.4"); W 192 mm (7.6"); D 176 mm (7.0")
Trip Level Settings 0.5 -12.5 A or 2.0-50.0 A
Trip Time Settings 0.1 -2. 5 s
Contact Operating Mode Selectable fail-safe or non-fail-safe
Harmonic Filtering Standard feature
Test Button Standard feature
Reset Button Standard feature
Communications
Output Contacts Isolated Form A and Form B
Conformally Coated Standard feature
Warranty 5 years
Mounting
Ethernet Optional
Panel, Surface
Rev: 4-C-121013
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