Littelfuse SE-100T User Manual
Accessories
Relay Testers
SE-100T SERIES
Ground-Fault-Relay Tester
Description
The SE-100T is a ground-fault-relay test unit designed to test
the current pickup level of ground-fault protection.
The tester injects current through the window of installed
ground-fault current transformers to verify the operation of
ground-fault monitors and relays.
It is used on substations, motor control centers (MCCs),
central distribution panels, switchboards, and test benches to
verify relay operation.
The SE-100T tests the entire ground-fault circuit including
current transformers, wiring, ground-fault relay and the
operation of the interrupting device. It is recommended to
test every relay and its current interrupting device annually.
Simplified Circuit Diagram
CT
NGR
SENSING
RESISTOR
L1
L2
NGR
MONITOR
L1
L2
CT
GROUND-FAULT
MONITOR
Features & Benefits
FEATURES BENEFITS
Output Current Levels
Remote Test Input
Low and high output levels to test a variety of
relays
Allows test to be initiated from another
location
Ordering Information
ORDERING NUMBER CONTROL POWER
SE-100T 120 Vac
Specifications
Input Voltage 120 Vac, 60 Hz, 30 VA
Dimensions H 150 mm (5.9”);
W 109 mm (4.3”);
D 100 mm (4.0”)
Output Current Levels L0 = 0.65 ± 0.1 A
HI = 2.75 ± 1.5A
Output Voltage 6.3 Vac maximum
Conformally Coated Standard feature
Warranty 5 Year
Mounting Surface
SE-100T SERIES
(Ground-Fault
L1
Relay Tester)
L2
© May 2012 Littelfuse Protection Relays & Controls www.littelfuse.com/relayscontrols
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