Protection Relays and Controls
Ungrounded DC System
SE-601 SERIES (PGR-2601)
DC Ground-Fault Monitor
Description
The SE-601 is a microprocessor-based ground-fault relay for
ungrounded dc systems. It provides sensitive ground-fault
protection without the problems associated with nuisance
tripping. Ground-fault current is sensed using an SE-GRM
Series Ground-Reference Module—a resistor network that
limits ground-fault current to 25 mA. The SE-601 is used
on ungrounded dc systems ranging from industrial 24-Vdc
control circuits to 1000-Vdc solar and transportation systems.
Features & Benefits
FEATURES
BENEFITS
Adjustable pickup
(1-20 mA)
Ten settings provide a wide range of
low-level protection
Adjustable time delay
(50 ms-2.5 s)
Adjustable trip delay allows quick protection or
delayed response
Form A and Form B output contacts for operation of
separate annunciation and trip circuits
Output contacts
Analog output
(0-5V)
Non-volatile trip
Memory
Provides means for connecting to a meter
(PGA-0500) or a control system
Retains trip state when de-energized to simplify
troubleshooting
Simplified Circuit Diagram
+
Selectable fail-safe or non-fail-safe operating
modes allow connection to shunt or undervoltage
breaker coil
Selectable contact
operating mode
A
SE-GRM SERIES
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Microprocessor based No calibration required saves on maintenance cost
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Accessories
-
A
SE-GRM Series Ground-Reference Module
Required accessory, used to connect the
SE-601 DC Ground-Fault Monitor to the
DC bus.
SE-601
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PGA-0500 Analog % Current Meter
Optional panel-mounted analog meter displays
ground-fault current as a percentage of 22
mA.
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Specifications
Ordering Information
IEEE Device Numbers
Input Voltage
Dimensions
Trip Level Settings
Trip Time Settings
Output Contacts
DC Overcurrent Relay (76G)
See ordering information
H 75 mm (3.0”); W 55 mm (2.2”); D 115 mm (4.5”)
1-20 mA
0.05-2.5 s
Isolated Form A and Form B
ORDERING NUMBER
SE-601-OU
CONTROL POWER
120/240 Vac/Vdc
12/24 Vdc
SE-601-OD
SE-601-OT
48 Vdc
Contact Operating Mode Selectable fail-safe or non-fail-safe
Test Button
Local
Local and remote
0-5 V
Consult factory
CSA certified, UL Listed (E340889),
CE (European Union), C-Tick (Australian)
5 years
DIN, Surface (standard)
Panel (with PMA-55 or PMA-60 adapter)
ACCESSORIES
SE-GRM SERIES
PGA-0500
REQUIREMENT
Required
Reset Button
Analog Output
Conformally Coated
Approvals
Optional
PMA-55
Optional
PMA-60
Optional
Warranty
Mounting
Note: For optional conformal coating please consult factory.
Rev: 4-C-050213
Based on Manual Rev 2-A-041913
© 2018 Littelfuse Protection Relays & Controls
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